Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Apr. 26, 2020	Apr. 28, 2019	Apr. 26, 2020		Apr. 28, 2019	Jul. 28, 2019	Jul. 29, 2018
Beginning Balance				$ (198)
Other comprehensive income (loss), after tax		$ (11)	$ (31)	192		$ (65)
Ending Balance		(7)		(7)
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		3	10	3		10	$ 8	25
Accumulated Translation Adjustment [Member]
Beginning Balance	[1]			(218)		(154)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				(11)		(49)
Other Comprehensive Income Reclassifications Current Period Net of Tax				210	[2]	0
Other comprehensive income (loss), after tax				199		(49)
Ending Balance	[1]	(19)	(201)	(19)		(201)
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				7		1
Other Comprehensive Income Reclassifications Current Period Net of Tax				1	[2]	0
Other comprehensive income (loss), after tax				8		1
Ending Balance	[3]	(1)	(6)	(1)		(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				(16)	[2]	(17)
Other comprehensive income (loss), after tax				(16)		(17)
Ending Balance	[4]	13	33	13		33
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance				(198)		(118)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				(4)		(48)
Other Comprehensive Income Reclassifications Current Period Net of Tax				195	[2]	(17)
Other comprehensive income (loss), after tax		(12)	(31)	191		(65)
Ending Balance		$ (7)	$ (174)	$ (7)		$ (174)
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 no tax as of April 26, 2020, a tax expense of $4 as of July 28, 2019, and April 28, 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 expense of $1 as of April 26, 2020, and a tax benefit of $2 as of July 28, 2019, $1 as of April 28, 2019, and $4 as of July 29, 2018.

[4] Included a tax expense of $3 as of April 26, 2020, $8 as of July 28, 2019, $10 as of April 28, 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.