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Fair Value Measurements Fair Value Measurements Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 28, 2018
Jul. 29, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, at Carrying Value $ 13 $ 14
Long-term Debt 8,391 8,595
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 13 14
Long-term Debt, Fair Value 8,040 $ 8,347
Deli Reporting Unit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Tangible Asset Impairment Charges 14  
Property, Plant, and Equipment, Fair Value Disclosure $ 38