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Stock Units Additional Shares [Member] T S R Performance Restricted Stock Units Additional Shares [Member] T S R Performance Restricted Stock Units Additional Shares[Member] Exercised, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Remaining unearned compensation on nonvested awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted-average remaining service period, years Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Nonvested, Units Nonvested, Weighted-Average Grant-Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Fair value of restricted units and shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Excess Tax Benefit/(Deficiency) from Share-based Compensation, Operating Activities Excess Tax Benefit from Share-based Compensation, Operating Activities Other Cost Savings Implementation Costs [Member] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Accrued Balance at beginning of period Restructuring Reserve Cash Payments Payments for Restructuring Accrued Balance at end of period Restructuring Reserve, Noncurrent Restructuring Reserve, Noncurrent Restructuring Charges Restructuring and Related Activities Disclosure [Text Block] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Trademarks [Member] Trademarks [Member] Noncompete Agreements [Member] Noncompete Agreements [Member] Indefinite-Lived Intangible Assets (Excluding Goodwill) Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Accumulated Defined Benefit Plans Adjustment [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Derivative Instrument Risk [Axis] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Earnings (loss) before taxes Net earnings (loss) attributable to Campbell Soup Company Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Soup [Member] Soups [Member] Soups [Member] Snacks [Member] Baked Snacks [Member] Baked Snacks [Member] Other Simple Meals [Member] Simple Meals [Member] Simple Meals [Member] Beverages [Member] Beverages [Member] Beverages [Member] Other [Member] Other [Member] Other product categories Share Repurchases Treasury Stock [Text Block] Indefinite-lived Intangible Assets [Member] Indefinite-lived Intangible Assets [Member] Other Noncurrent Liabilities [Member] Finite-Lived Intangible Assets [Member] Finite-Lived Intangible Assets [Member] Payoff of Idebtedness [Axis] Payoff of Idebtedness [Axis] Payoff of Indebtedness [Axis] Payoff of Idebtedness [Domain] Payoff of Idebtedness [Domain] [Domain] for Payoff of Indebtedness [Axis] Payoff of Indebtedness [Member] Payoff of Indebtedness [Member] Payoff of Indebtedness [Member] Pacific Foods [Member] Pacific Foods [Member] Pacific Foods [Member] Business Acquisition, Share Price Business Acquisition, Share Price Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Long-term Debt Long-term Debt Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Beginning Balance Foreign currency translation adjustment Goodwill, Foreign Currency Translation Gain (Loss) Ending Balance Goodwill, Accumulated Impairment Loss Goodwill, Impaired, Accumulated Impairment Loss Defined Benefit Plan, Actuarial Gain (Loss) Defined Benefit Plans Recognized Actuarial Gains (Losses) The amount of gains or (losses) recognized in net periodic benefit cost expense / (income) resulting from changes in actuarial assumptions. Restructuring and Related Cost, Incurred Cost Planned divestiture costs Business Exit Costs Business combination, acquisition related costs Business Combination, Acquisition Related Costs Impairment charges Asset Impairment Charges Goodwill and Intangible Asset Impairment Goodwill and Intangible Asset Impairment Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Expected term, years Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Beginning of year, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Terminated, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period End of year, Options Exercisable at end of period, Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Beginning of period, Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted, Weighted-Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised, Weighted-Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Terminated, Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price End of period, Weighted-Average Exercise Price Exercisable at end of period, Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Outstanding at end of period, Weighted-Average Remaining Contractual Life (In years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Exercisable at end of period, Weighted-Average Remaining Contractual Life (In years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Outstanding at end of period, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Exercisable at end of period, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Schedule Of Pre-Tax Charge And Remaining Costs [Table Text Block] Restructuring and Related Costs [Table Text Block] Schedule Of Restructuring Activity And Related Reserves [Table Text Block] Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Schedule Of Restructuring Charges Associated With Each Reportable Segment Schedule of Restructuring and Related Costs By Segment [Table Text Block] Schedule of Restructuring and Related Costs By Segment [Table Text Block] Statement of Financial Position [Abstract] Variable Interest Entity Variable Interest Entity, Primary Beneficiary [Member] Current assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Inventories Other current assets Other Assets, Current Total current assets Plant assets, net of depreciation Property, Plant and Equipment, Net Other intangible assets, net of amortization Intangible Assets, Net (Excluding Goodwill) Other assets ($70 as of 2019 and $77 as of 2018 attributable to variable interest entity) Other Assets, Noncurrent Total assets Current liabilities Liabilities, Current [Abstract] Short-term borrowings Debt, Current Dividends payable Dividends Payable, Current Total current liabilities Long-term debt Long-term Debt and Capital Lease Obligations Deferred taxes Deferred Tax Liabilities, Net, Noncurrent Other liabilities Other Liabilities, Noncurrent Total liabilities Commitments and contingencies Commitments and Contingencies Campbell Soup Company shareholders' equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Preferred stock; authorized 40 shares; none issued Preferred Stock, Value, Issued Capital stock, $.0375 par value; authorized 560 shares; issued 323 shares Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Capital stock in treasury, at cost Treasury Stock, Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total Campbell Soup Company shareholders' equity Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Total equity Total liabilities and equity Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Capital Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Cover Non-Printing [Abstract] Cover Non-Printing [Abstract] Entities [Table] Entities [Table] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Current Reporting Status Entity Current Reporting Status Supplemental Financial Information Data Additional Financial Information Disclosure [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Plum [Member] Plum [Member] Plum [Member] Cash and Cash Equivalents, Fair Value Disclosure Cash and Cash Equivalents, Fair Value Disclosure Cash and Cash Equivalents, at Carrying Value Other Cash Equivalents, at Carrying Value Long-term Debt, Fair Value Long-term Debt, Fair Value Schedule Of Balance Sheets Supplemental Disclosures [Table Text Block] Supplemental Balance Sheet Disclosures [Text Block] Schedule Of Statements Of Earnings Supplemental Disclosures [Table Text Block] Schedule Of Statements Of Earnings Supplemental Disclosures [Table Text Block] Schedule Of Statements Of Earnings Supplemental Disclosures [Table Text Block] Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Noncontrolling Interest Noncontrolling Interest Disclosure [Text Block] OCI before tax accumulated derivative gain (loss) beginning of period OCI before tax accumulated derivative gain (loss) Accumulated balance, before tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net OCI before tax accumulated derivative gain (loss) end of period Statement of Stockholders' Equity [Abstract] Capital Stock Issued [Member] Common Stock [Member] Capital Stock In Treasury [Member] Additional Paid-In Capital [Member] Additional Paid-in Capital [Member] Noncontrolling Interests [Member] Noncontrolling Interest [Member] Capital stock, shares Shares, Issued Treasury Stock, Shares Treasury Stock, Shares Balance, value Other comprehensive income (loss) Dividends Dividends, Common Stock, Cash Dividends per share Common Stock, Dividends, Per Share, Declared Treasury stock purchased, shares Treasury stock purchased, value Treasury stock issued under management incentive and stock option plans, shares Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Treasury stock issued under management incentive and stock option plans, value Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Capital stock, shares Treasury Stock, Shares Balance, value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Level 3 investments at beginning of year Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value, Level 3 investment gain (Loss) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Fair Value, Level 3 investment Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Fair Value, Level 3 investments at end of year Impairment of intangible assets Net periodic defined benefits income other than service cost Net Periodic Defined Benefits Expense (Income), Excluding Service Cost Component Net Periodic Defined Benefits Expense (Income), Excluding Service Cost Component. Includes amounts capitalized to inventory. Investment losses Gain (Loss) on Investments Business combination, acquisition related costs Other expenses Other Expenses Other Income Other Income Other expenses / (income) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Equity Award [Domain] Deferred Compensation, Share-based Payments [Member] Deferred Compensation, Share-based Payments [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Statement of Cash Flows [Abstract] Statement, Scenario [Axis] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net earnings to operating cash flow Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Impairment charges Stock-based compensation Share-based Compensation Noncurrent income taxes Other Noncash Expense Pension and postretirement benefit income Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash Depreciation and amortization Depreciation, Depletion and Amortization Deferred income taxes Deferred Income Taxes and Tax Credits Other, net Other Noncash Income (Expense) Changes in working capital, net of acquisition Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts and Other Receivables Inventories Increase (Decrease) in Inventories Prepaid assets Increase (Decrease) in Prepaid Expense Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net payments of hedging activities Payments Of Receipts From Hedging Activities The net cash outflow (inflow) associated with derivative instruments, such as swaps, forwards, options, and so forth. Other Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of plant assets Purchases of route businesses Payments to Acquire Intangible Assets Sales of route businesses Proceeds from Sale of Intangible Assets Businesses acquired, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Other, net Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Short-term borrowings Proceeds from Short-term Debt Short-term repayments Repayments of Short-term Debt Long-term repayments Repayments of Long-term Debt Dividends paid Payments of Ordinary Dividends, Common Stock Treasury stock purchases Payments for Repurchase of Common Stock Payments related to tax withholding for stock-based compensation Payments Related to Tax Withholding for Share-based Compensation Payments of debt issuance costs Payments of Debt Issuance Costs Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Net change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents - beginning of period Cash and cash equivalents - end of period Summary of Stock-based Compensation Expense [Table Text Block] Summary of Stock-based Compensation Expense [Table Text Block] Tabular disclosure of stock-based compensation expense and tax-related benefits. Schedule Of Stock Option Activity [Table Text Block] Share-based Compensation, Stock Options, Activity [Table Text Block] Time-Lapse Restricted Stock Units and EPS Performance Restricted Stock Units[Table Text Block] Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] TSR Performance Restricted Stock Units [Table Text Block] Share-based Compensation Arrangements by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest [Table Text Block] Schedule Of Share Based Payment Award Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Accumulated Translation Adjustment [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] Beginning Balance Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Other Comprehensive Income Reclassifications Current Period Net of Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Ending Balance Accumulated Other Comprehensive Income Foreign Currency Translation Tax (Benefit) Expense Accumulated Other Comprehensive Income Foreign Currency Translation Tax Benefit Expense Foreign Currency Translation Tax Benefit/Expense Accumulated Other Comprehensive Income Cashflow Hedges Tax (Benefit) Expense Accumulated Other Comprehensive Income Cashflow Hedges Tax Benefit Expense Cash Flow hedges Tax Benefit/Expense Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax (Benefit) Expense Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax Benefit Expense Unamortized Pension and Post-Retirement, Tax Benefit/Expense Other Liabilities [Member] Other Liabilities [Member] Derivative Asset, Fair Value, Gross Asset Derivative Asset, Fair Value, Gross Asset Derivative Liability, Fair Value, Gross Liability Derivative Liability, Fair Value, Gross Liability Components Of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Total Commitment [Member] Total Commitment [Member] Total Commitment [Member] Other Commitment Other Commitment Investments funded Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Other assets Other Commitments, Description Other Commitments, Description Derivative Asset, Fair Value, Gross Asset Derivative, Collateral, Obligation to Return Securities or Cash Derivative, Collateral, Obligation to Return Securities or Cash Derivative, Collateral, Obligation to Return Securities or Cash Derivative Asset, Fair Value, Amount Offset Against Collateral Derivative Asset, Fair Value, Amount Offset Against Collateral Derivative, Collateral, Right to Reclaim Securities or Cash Derivative, Collateral, Right to Reclaim Securities or Cash Derivative, Collateral, Right to Reclaim Securities or Cash Derivative Liability, Fair Value, Amount Offset Against Collateral Derivative Liability, Fair Value, Amount Offset Against Collateral Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Indefinite-Lived Intangible Assets [Table Block] Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Finite-Lived Intangible Assets by Major Class [Axis] Other Intangible Assets [Member] Other Intangible Assets [Member] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net Indefinite-lived Intangible Assets (Excluding Goodwill) Indefinite-lived Intangible Assets (Excluding Goodwill) Total net intangible assets Schedule Of Segment Reporting [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Additional Product Information for Net Sales [Table Text Block] Revenue from External Customers by Products and Services [Table Text Block] Fair Value Measurements Fair Value Disclosures [Text Block]