Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jan. 26, 2020	Jan. 27, 2019	Jan. 26, 2020		Jan. 27, 2019	Jul. 28, 2019	Jul. 29, 2018
Beginning Balance				$ (198)
Other comprehensive income (loss), after tax		$ 130	$ 13	203		$ (34)
Ending Balance		5		5
Accumulated Other Comprehensive Income Foreign Currency Translation Tax (Benefit) Expense			4			4	$ 4	$ 6
Accumulated Other Comprehensive Income Cashflow Hedges Tax (Benefit) Expense		(1)	(1)	(1)		(1)	(2)	(4)
Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax (Benefit) Expense		5	12	5		12	$ 8	25
Accumulated Translation Adjustment [Member]
Beginning Balance	[1]			(218)		(154)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				3		(23)
Other Comprehensive Income Reclassifications Current Period Net of Tax				210	[2]	0
Other comprehensive income (loss), after tax				213		(23)
Ending Balance	[1]	(5)	(175)	(5)		(175)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Beginning Balance	[3]			(9)		(4)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				1		(1)
Other Comprehensive Income Reclassifications Current Period Net of Tax				0	[2]	1
Other comprehensive income (loss), after tax				1		0
Ending Balance	[3]	(8)	(7)	(8)		(7)
Accumulated Defined Benefit Plans Adjustment [Member]
Beginning Balance	[4]			29		40
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				0		0
Other Comprehensive Income Reclassifications Current Period Net of Tax				(11)	[2]	(11)
Other comprehensive income (loss), after tax				(11)		(11)
Ending Balance	[4]	18	39	18		39
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance				(198)		(118)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				4		(24)
Other Comprehensive Income Reclassifications Current Period Net of Tax				199	[2]	(10)
Other comprehensive income (loss), after tax		131	13	203		(34)
Ending Balance		$ 5	$ (143)	$ 5		$ (143)
Accounting Standards Update 2018-02 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	[5]							0
Accounting Standards Update 2018-02 [Member] | Accumulated Translation Adjustment [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	[6]							2
Accounting Standards Update 2018-02 [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	[6]							(3)
Accounting Standards Update 2018-02 [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	[6]							10
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	[5],[6]							$ 9

[1] Included a tax expense of $4 as of July 28, 2019, and January 27, 2019, and $6 as of July 29, 2018.

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

[3] Included a tax benefit of $1 as of January 26, 2020, $2 as of July 28, 2019, $1 as of January 27, 2019, and $4 as of July 29, 2018.

[4] Included a tax expense of $5 as of January 26, 2020, $8 as of July 28, 2019, $12 as of January 27, 2019, and $25 as of July 29, 2018.

[5] See Note 2 for additional detail.

[6] Reflects the adoption of the FASB guidance on stranded tax effects. See Note 2 for additional information.