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Commitments and Contingencies Commitments and Contingencies (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 29, 2018
USD ($)
Apr. 30, 2017
USD ($)
Apr. 29, 2018
USD ($)
Apr. 30, 2017
USD ($)
Other Commitments [Line Items]        
Legal charges $ 22 $ 0 $ 22 $ 0
Additional Operating Lease Commitments 130   $ 130  
Pepperidge Farm [Member]        
Other Commitments [Line Items]        
Number of bank loans guarantees related to independent distributors     2,000  
Maximum potential amount of future payments 207   $ 207  
Snyder's-Lance [Member]        
Other Commitments [Line Items]        
Number of bank loans guarantees related to independent distributors     2,300  
Aggregate amount of independent business owner loans $ 183   $ 183  
Maximum percent of loan payment as guarantor 25.00%   25.00%