Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jan. 31, 2021	Jan. 26, 2020	Jan. 31, 2021	Jan. 26, 2020		Aug. 02, 2020	Jul. 28, 2019
Beginning Balance				$ (10)
Other comprehensive income (loss), after tax		$ 3	$ 130	2	$ 203
Ending Balance		(5)		(5)
Accumulated Other Comprehensive Income Foreign Currency Translation Tax (Benefit) Expense		0	0	0	0		$ 0	$ 4
Accumulated Other Comprehensive Income Cashflow Hedges Tax (Benefit) Expense		(2)	(1)	(2)	(1)		(1)	(2)
Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax (Benefit) Expense		2	5	2	5		$ 2	$ 8
Accumulated Translation Adjustment [Member]
Beginning Balance	[1]			(10)	(218)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				10	3
Other Comprehensive Income Reclassifications Current Period Net of Tax				0	210	[2]
Other comprehensive income (loss), after tax				10	213
Ending Balance	[1]	0	(5)	0	(5)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Beginning Balance	[3]			(7)	(9)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				(6)	1
Other Comprehensive Income Reclassifications Current Period Net of Tax				3	0	[2]
Other comprehensive income (loss), after tax				(3)	1
Ending Balance	[3]	(10)	(8)	(10)	(8)
Accumulated Defined Benefit Plans Adjustment [Member]
Beginning Balance	[4]			7	29
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				0	0
Other Comprehensive Income Reclassifications Current Period Net of Tax				(2)	(11)	[2]
Other comprehensive income (loss), after tax				(2)	(11)
Ending Balance	[4]	5	18	5	18
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance				(10)	(198)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				4	4
Other Comprehensive Income Reclassifications Current Period Net of Tax				1	199	[2]
Other comprehensive income (loss), after tax		4	131	5	203
Ending Balance		$ (5)	$ 5	$ (5)	$ 5

[1] Included no tax as of January 31, 2021, August 2, 2020, and January 26, 2020 and tax expense of $4 as of July 28, 2019.

[2] Reflects amounts reclassified from sale of businesses. See Note 3 for additional information.

[3] Included a tax benefit of $2 as of January 31, 2021, $1 as of August 2, 2020, and January 26, 2020, and $2 as of July 28, 2019.

[4] Included tax expense of $2 as of January 31, 2021, and as of August 2, 2020, $5 as of January 26, 2020, and $8 as of July 28, 2019.