Pension And Postretirement Benefits (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Jul. 30, 2023	Jul. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Pensions	$ 164	$ 146
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pensions	164	146
Liability, Defined Benefit Plan, Current	10	13
Liability, Defined Benefit Plan, Noncurrent	95	107
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	59	26
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	0	1
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pensions	0	0
Liability, Defined Benefit Plan, Current	18	19
Liability, Defined Benefit Plan, Noncurrent	135	153
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(153)	(172)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	$ (3)	$ (4)