Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended
		Oct. 30, 2016	Nov. 01, 2015	Jul. 31, 2016
Beginning Balance		$ (104)
Other comprehensive income (loss), after tax		(2)	$ (32)
Ending Balance		(107)
Accumulated Translation Adjustment [Member]
Beginning Balance	[1]	(124)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax		(9)
Other Comprehensive Income Reclassifications Current Period Net of Tax		0
Other comprehensive income (loss), after tax		(9)
Ending Balance	[1]	(133)
Other comprehensive income tax		(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		8
Other Comprehensive Income Reclassifications Current Period Net of Tax		2
Other comprehensive income (loss), after tax		10
Ending Balance	[2]	(31)
Other comprehensive income tax		18		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		(4)
Other comprehensive income (loss), after tax		(4)
Ending Balance	[3]	57
Other comprehensive income tax		(33)		$ (35)
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance		(104)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax		(1)
Other Comprehensive Income Reclassifications Current Period Net of Tax		(2)
Other comprehensive income (loss), after tax		(3)	$ (32)
Ending Balance		$ (107)

[1] Included a tax expense of $6 as of October 30, 2016, and July 31, 2016.

[2] Included a tax benefit of $18 as of October 30, 2016, and $23 as of July 31, 2016.

[3] Included a tax expense of $33 as of October 30, 2016, and $35 as of July 31, 2016.