Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						12 Months Ended
	Aug. 03, 2014		Apr. 27, 2014	Jan. 26, 2014	Oct. 27, 2013		Aug. 03, 2014		Jul. 28, 2013		Jul. 29, 2012
Beginning Balance					$ (565)		$ (565)
Other comprehensive income (loss), after tax							(3)		210		(349)
Ending Balance	(569)						(569)		(565)
Accumulated Other Comprehensive Income Foreign Currency Translation Tax (Benefit) Expense	7						7		9		12
Accumulated Other Comprehensive Income Cashflow Hedges Tax (Benefit) Expense	(1)						(1)		3		(6)
Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax (Benefit) Expense	(405)						(405)		(424)		(581)
Defined Benefit Plan Recognized Net Gain (Loss) Due to Settlements Net Of Tax	(3)		(11)	0	0
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements							(22)		0		0
Defined Benefit Plan Recognized Net Gain (Loss) Due to Settlements Net Of Tax							(14)
Accumulated Translation Adjustment [Member]
Beginning Balance					170	[1]	170	[1]	261	[1]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax							(14)		(91)
Other Comprehensive Income Reclassifications Current Period Net of Tax							(19)		0
Other comprehensive income (loss), after tax							(33)		(91)
Ending Balance	137	[1]					137	[1]	170	[1]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Beginning Balance					5	[2]	5	[2]	(10)	[2]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax							(8)		12
Other Comprehensive Income Reclassifications Current Period Net of Tax							0		3
Other comprehensive income (loss), after tax							(8)		15
Ending Balance	(3)	[2]					(3)	[2]	5	[2]
Accumulated Defined Benefit Plans Adjustment [Member]
Beginning Balance					(740)	[3]	(740)	[3]	(1,027)	[3]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax							(35)		219
Other Comprehensive Income Reclassifications Current Period Net of Tax							72		68
Other comprehensive income (loss), after tax							37		287
Ending Balance	(703)	[3]					(703)	[3]	(740)	[3]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance					(565)		(565)		(776)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax							(57)		140
Other Comprehensive Income Reclassifications Current Period Net of Tax							53		71
Other comprehensive income (loss), after tax							(4)		211		(349)
Ending Balance	$ (569)						$ (569)		$ (565)		$ (776)

[1] Included a tax expense of $7 as of August 3, 2014, $9 as of July 28, 2013 and $12 as of July 29, 2012. The amount reclassified from other comprehensive income was related to the divestiture of the European simple meals business and was included in Earnings (loss) from discontinued operations.

[2] Included a tax benefit of $1 as of August 3, 2014, a tax expense of $3 as of July 28, 2013 and a tax benefit of $6 as of July 29, 2012.

[3] Included a tax benefit of $405 as of August 3, 2014, $424 as of July 28, 2013 and $581 as of July 29, 2012. The amount reclassified in 2014 from other comprehensive income included pre-tax settlement charges of $22, or $14 after tax.