Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	May 03, 2015		Apr. 27, 2014	May 03, 2015		Apr. 27, 2014	Aug. 03, 2014
Beginning Balance				$ (569)
Other comprehensive income (loss), after tax	30		90	(196)		38
Ending Balance	(765)			(765)
Accumulated Other Comprehensive Income Foreign Currency Translation Tax (Benefit) Expense	6			6			7
Accumulated Other Comprehensive Income Cashflow Hedges Tax (Benefit) Expense	(9)			(9)			(1)
Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax (Benefit) Expense	(376)			(376)			(405)
Accumulated Translation Adjustment [Member]
Beginning Balance				137	[1]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				(237)
Other Comprehensive Income Reclassifications Current Period Net of Tax				0
Other comprehensive income (loss), after tax				(237)
Ending Balance	(100)	[1]		(100)	[1]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Beginning Balance				(3)	[2]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				(13)
Other Comprehensive Income Reclassifications Current Period Net of Tax				0
Other comprehensive income (loss), after tax				(13)
Ending Balance	(16)	[2]		(16)	[2]
Accumulated Defined Benefit Plans Adjustment [Member]
Beginning Balance				(703)	[3]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				9
Other Comprehensive Income Reclassifications Current Period Net of Tax				45
Other comprehensive income (loss), after tax				54
Ending Balance	(649)	[3]		(649)	[3]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance				(569)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				(241)
Other Comprehensive Income Reclassifications Current Period Net of Tax				45
Other comprehensive income (loss), after tax				(196)		38
Ending Balance	$ (765)			$ (765)

[1] Included a tax expense of $6 as of May 3, 2015, and $7 as of August 3, 2014.

[2] Included a tax benefit of $9 as of May 3, 2015, and $1 as of August 3, 2014.

[3] Included a tax benefit of $376 as of May 3, 2015, and $405 as of August 3, 2014.