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Stock-based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
May 03, 2015
Apr. 27, 2014
May 03, 2015
Apr. 27, 2014
Aug. 03, 2014
Stock-based Compensation          
Pre-tax stock-based compensation expense $ 15us-gaap_AllocatedShareBasedCompensationExpense $ 9us-gaap_AllocatedShareBasedCompensationExpense $ 46us-gaap_AllocatedShareBasedCompensationExpense $ 45us-gaap_AllocatedShareBasedCompensationExpense  
Tax-related benefits 6us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 17us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 17us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense  
Cash received from the exercise of stock options     9us-gaap_ProceedsFromStockOptionsExercised 14us-gaap_ProceedsFromStockOptionsExercised  
Total intrinsic value of options exercised     5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue  
Excess tax benefits on stock-based compensation     5us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 11us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities  
EPS Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Nonvested, Units 252us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cpb_EpsPerformanceRestrictedStockUnitsMember
  252us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cpb_EpsPerformanceRestrictedStockUnitsMember
   
Nonvested, Weighted-Average Grant-Date Fair Value $ 40.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_EpsPerformanceRestrictedStockUnitsMember
  $ 40.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_EpsPerformanceRestrictedStockUnitsMember
   
Strategic Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Nonvested, Units 373us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cpb_StrategicPerformanceRestrictedStockUnitsMember
  373us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cpb_StrategicPerformanceRestrictedStockUnitsMember
   
Nonvested, Weighted-Average Grant-Date Fair Value $ 41.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_StrategicPerformanceRestrictedStockUnitsMember
  $ 41.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_StrategicPerformanceRestrictedStockUnitsMember
   
Special Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Nonvested, Weighted-Average Grant-Date Fair Value $ 42.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_SpecialPerformanceRestrictedStockUnitsMember
  $ 42.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_SpecialPerformanceRestrictedStockUnitsMember
   
Granted, Units     184us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cpb_SpecialPerformanceRestrictedStockUnitsMember
   
Award Vesting Period     2 years 0 months    
Time-Lapse, EPS Performance, Strategic Performance And Special Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Nonvested, Units 2,398us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
  2,398us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
  2,994us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
Nonvested, Weighted-Average Grant-Date Fair Value $ 41.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
  $ 41.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
  $ 37.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
Granted, Units     1,080us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
   
Remaining unearned compensation on nonvested awards 38us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
  38us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
   
Weighted-average remaining service period, years     1 year 8 months    
Fair value of restricted units and shares vested     54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
105us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
 
Granted, Weighted-Average Grant-Date Fair Value     $ 42.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
$ 39.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_TimeLapseEPSStrategicPerformanceAndSpecialPerformanceRestrictedStockUnitsMember
 
TSR Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Nonvested, Units 1,642us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
  1,642us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
  861us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
Nonvested, Weighted-Average Grant-Date Fair Value $ 40.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
  $ 40.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
  $ 38.15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
Granted, Units     874us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
   
Remaining unearned compensation on nonvested awards $ 32us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
  $ 32us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
   
Weighted-average remaining service period, years     2 years 1 month    
Granted, Weighted-Average Grant-Date Fair Value     $ 43.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
  $ 36.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cpb_TSRPerformanceRestrictedStockUnitsMember
Minimum [Member] | EPS Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Potential Percentage Of Grant Under Performance Plan     0.00%cpb_PotentialPercentageOfGrantUnderPerformancePlan
/ us-gaap_AwardTypeAxis
= cpb_EpsPerformanceRestrictedStockUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Minimum [Member] | Strategic Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Potential Percentage Of Grant Under Performance Plan     0.00%cpb_PotentialPercentageOfGrantUnderPerformancePlan
/ us-gaap_AwardTypeAxis
= cpb_StrategicPerformanceRestrictedStockUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Minimum [Member] | Special Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Potential Percentage Of Grant Under Performance Plan     0.00%cpb_PotentialPercentageOfGrantUnderPerformancePlan
/ us-gaap_AwardTypeAxis
= cpb_SpecialPerformanceRestrictedStockUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member] | EPS Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Potential Percentage Of Grant Under Performance Plan     100.00%cpb_PotentialPercentageOfGrantUnderPerformancePlan
/ us-gaap_AwardTypeAxis
= cpb_EpsPerformanceRestrictedStockUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Maximum [Member] | Strategic Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Potential Percentage Of Grant Under Performance Plan     200.00%cpb_PotentialPercentageOfGrantUnderPerformancePlan
/ us-gaap_AwardTypeAxis
= cpb_StrategicPerformanceRestrictedStockUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Maximum [Member] | Special Performance Restricted Stock Units [Member]          
Stock-based Compensation          
Potential Percentage Of Grant Under Performance Plan     150.00%cpb_PotentialPercentageOfGrantUnderPerformancePlan
/ us-gaap_AwardTypeAxis
= cpb_SpecialPerformanceRestrictedStockUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember