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Commitments and Contingencies (Narrative) (Details)
$ in Millions
12 Months Ended
Jul. 29, 2018
USD ($)
Jul. 30, 2017
USD ($)
Jul. 31, 2016
USD ($)
Other Commitments [Line Items]      
Legal Fees $ 22    
Operating Leases, Rent Expense, Net $ 74 $ 53 $ 45
Pepperidge Farm [Member]      
Other Commitments [Line Items]      
Number of bank loans guarantees related to independent distributors 2,000    
Maximum potential amount of future payments $ 210    
Snyder's-Lance [Member]      
Other Commitments [Line Items]      
Number of bank loans guarantees related to independent distributors 2,400    
Maximum potential amount of future payments $ 187