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Acquistions (Narrative) (Details)
$ in Millions
12 Months Ended
Jun. 29, 2015
USD ($)
Aug. 08, 2013
USD ($)
Aug. 03, 2014
USD ($)
Jul. 31, 2016
USD ($)
[1]
Aug. 02, 2015
USD ($)
Business Acquisition [Line Items]          
Goodwill     $ 2,433 $ 2,263 $ 2,344
Garden Fresh Gourmet [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Gross $ 232        
Goodwill 116        
Garden Fresh Gourmet [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 48        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 20 years        
Garden Fresh Gourmet [Member] | Trademarks [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets $ 38        
Kelsen [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Gross   $ 331      
Number of Countries in which Entity Operates   85      
Goodwill   $ 140      
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     193    
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual     $ 8    
Kelsen [Member] | Trademarks [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 4      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   10 years      
Kelsen [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 22      
Kelsen [Member] | Customer Relationships [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   10 years      
Kelsen [Member] | Customer Relationships [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   15 years      
Kelsen [Member] | Trademarks [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets   $ 147      
[1] The total carrying value of goodwill as of July 31, 2016 is reflected net of $106 of accumulated impairment charges recorded in 2016.