Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended
		Oct. 27, 2019		Oct. 28, 2018	Jul. 28, 2019	Jul. 29, 2018
Beginning Balance		$ (198)
Other comprehensive income (loss), after tax		73		$ (47)
Ending Balance		(126)
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)	(2)	(4)
Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax (Benefit) Expense		7		13	$ 8	25
Accumulated Translation Adjustment [Member]
Beginning Balance	[1]	(218)		(154)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax		(5)		(43)
Other Comprehensive Income Reclassifications Current Period Net of Tax		82	[2]	0
Other comprehensive income (loss), after tax		77		(43)
Ending Balance	[1]	(141)		(195)
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		0		0
Other Comprehensive Income Reclassifications Current Period Net of Tax		1	[2]	1
Other comprehensive income (loss), after tax		1		1
Ending Balance	[3]	(8)		(6)
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		(6)	[2]	(5)
Other comprehensive income (loss), after tax		(6)		(5)
Ending Balance	[4]	23		45
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance		(198)		(118)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax		(5)		(43)
Other Comprehensive Income Reclassifications Current Period Net of Tax		77	[2]	(4)
Other comprehensive income (loss), after tax		72		(47)
Ending Balance		$ (126)		$ (156)
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 October 27, 2019, July 28, 2019, October 28, 2018, 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 October 27, 2019, $2 as of July 28, 2019, $1 as of October 28, 2018, and $4 as of July 29, 2018.

[4] Included a tax expense of $7 as of October 27, 2019, $8 as of July 28, 2019, $13 as of October 28, 2018, 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.