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Fair Value Measurements Fair Value Measurements (Nonrecurring) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 29, 2017
Jul. 31, 2016
Jan. 29, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill, Impairment Loss     $ 191
Campbell Fresh [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill, Impairment Loss     191
Campbell Fresh [Member] | Bolthouse Farms carrot and carrot ingredients reporting unit [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill, Impairment Loss $ 127 $ 106  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 20 35  
Campbell Fresh [Member] | Garden Fresh Gourmet [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill, Impairment Loss 64    
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 1    
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Campbell Fresh [Member] | Bolthouse Farms carrot and carrot ingredients reporting unit [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill, Fair Value Disclosure 75 202 75
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure 48 $ 68 48
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Campbell Fresh [Member] | Garden Fresh Gourmet [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill, Fair Value Disclosure 52   52
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure $ 37   $ 37