Pension And Postretirement Benefits (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Aug. 02, 2020	Jul. 28, 2019
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	$ 10	$ 21
Noncurrent liabilities of discontinued operations	0	65
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	10	21
Liability, Defined Benefit Plan, Current	14	14
Liability, Defined Benefit Plan, Noncurrent	242	179
Noncurrent liabilities of discontinued operations	0	20
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	246	192
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	(1)	(1)
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	24	25
Liability, Defined Benefit Plan, Noncurrent	220	210
Noncurrent liabilities of discontinued operations	0	0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	244	235
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	$ 10	$ 38