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Fair Value Measurements (Assets Measured on Recurring Basis Unobservable Input Reconciliation (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2023 | May 01, 2022 | Jul. 31, 2022 | Aug. 01, 2021
Fair Value Disclosures [Abstract] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ 4 | $ 8 | $ 4 | $ 1
Fair Value, Level 3 investment gain (Loss) Included in Earnings | 4 | 18 |  |
Fair Value, Level 3 Investment, Settlements | $ (4) | $ (11) |  |

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