Financial Instruments (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Millions	Jan. 26, 2025	Jul. 28, 2024
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Derivative Assets	$ 19	$ 11
Derivative Asset, Not Offset, Policy Election Deduction	(3)	(1)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election, Total	16	10
Derivative Liability	6	16
Derivative Liability, Not Offset, Policy Election Deduction	(3)	(1)
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 3	$ 15