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Financial Instruments (Offsetting Assets and Liabilities) (Details) - USD ($)
$ in Millions
Jan. 29, 2017
Jul. 31, 2016
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Derivative Asset, Fair Value, Gross Asset $ 6 $ 5
Derivative Asset, Not Offset, Policy Election Deduction (4) (4)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election 2 1
Derivative Liability, Fair Value, Gross Liability 21 60
Derivative Liability, Not Offset, Policy Election Deduction (4) (4)
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election $ 17 $ 56