Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jan. 29, 2017	Jan. 31, 2016	Jan. 29, 2017	Jan. 31, 2016	Jul. 31, 2016
Beginning Balance				$ (104)
Other comprehensive income (loss), after tax		$ (6)	$ (21)	(8)	$ (53)
Ending Balance		(113)		(113)
Accumulated Translation Adjustment [Member]
Beginning Balance	[1]			(124)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				(25)
Other Comprehensive Income Reclassifications Current Period Net of Tax				0
Other comprehensive income (loss), after tax				(25)
Ending Balance	[1]	(149)		(149)
Other comprehensive income tax		(6)		(6)		$ (6)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Beginning Balance	[2]			(41)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				19
Other Comprehensive Income Reclassifications Current Period Net of Tax				5
Other comprehensive income (loss), after tax				24
Ending Balance	[2]	(17)		(17)
Other comprehensive income tax		10		10		23
Accumulated Defined Benefit Plans Adjustment [Member]
Beginning Balance	[3]			61
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				0
Other Comprehensive Income Reclassifications Current Period Net of Tax				(8)
Other comprehensive income (loss), after tax				(8)
Ending Balance	[3]	53		53
Other comprehensive income tax		(30)		(30)		$ (35)
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance				(104)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				(6)
Other Comprehensive Income Reclassifications Current Period Net of Tax				(3)
Other comprehensive income (loss), after tax				(9)	$ (55)
Ending Balance		$ (113)		$ (113)

[1] Included a tax expense of $6 as of January 29, 2017, and July 31, 2016.

[2] Included a tax benefit of $10 as of January 29, 2017, and $23 as of July 31, 2016.

[3] Included a tax expense of $30 as of January 29, 2017, and $35 as of July 31, 2016.