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Financial Instruments (Offsetting Assets and Liabilities) (Details) - USD ($)
$ in Millions
Aug. 01, 2021
Aug. 02, 2020
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Derivative Asset, Fair Value, Gross Asset $ 57 $ 12
Derivative, Collateral, Obligation to Return Securities or Cash (1) (4)
Derivative Asset, Fair Value, Amount Offset Against Collateral 56 8
Derivative Liability, Fair Value, Gross Liability 3 11
Derivative, Collateral, Right to Reclaim Securities or Cash (1) (4)
Derivative Liability, Fair Value, Amount Offset Against Collateral $ 2 $ 7