Pension And Postretirement Benefits (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Jul. 28, 2024	Jul. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	$ 143	$ 164
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	143	164
Liability, Defined Benefit Plan, Current	10	10
Liability, Defined Benefit Plan, Noncurrent	93	95
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	40	59
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	0	0
Liability, Defined Benefit Plan, Current	17	18
Liability, Defined Benefit Plan, Noncurrent	128	135
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(145)	(153)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	$ (3)	$ (3)