Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended				12 Months Ended
		Aug. 03, 2014	Apr. 27, 2014	Jan. 26, 2014	Oct. 27, 2013	Aug. 02, 2015	Aug. 03, 2014	Jul. 28, 2013
Beginning Balance						$ (569)
Other comprehensive income (loss), after tax						(341)	$ (3)	$ 210
Ending Balance		$ (569)				(909)	(569)
Accumulated Other Comprehensive Income Foreign Currency Translation Tax (Benefit) Expense		7				6	7	9
Accumulated Other Comprehensive Income Cashflow Hedges Tax (Benefit) Expense		(1)				(5)	(1)	3
Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax (Benefit) Expense		(405)				(417)	(405)	(424)
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						0	22	0
Defined Benefit Plan Recognized Net Gain Loss Due to Settlements Net Of Tax							14
Accumulated Translation Adjustment [Member]
Beginning Balance	[1]				170	137	170
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax						(322)	(14)
Other Comprehensive Income Reclassifications Current Period Net of Tax						0	(19)
Other comprehensive income (loss), after tax						(322)	(33)
Ending Balance	[1]	137				(185)	137	170
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Beginning Balance	[2]				5	(3)	5
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax						(2)	(8)
Other Comprehensive Income Reclassifications Current Period Net of Tax						0	0
Other comprehensive income (loss), after tax						(2)	(8)
Ending Balance	[2]	(3)				(5)	(3)	5
Accumulated Defined Benefit Plans Adjustment [Member]
Beginning Balance	[3]				(740)	(703)	(740)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax						(77)	(35)
Other Comprehensive Income Reclassifications Current Period Net of Tax						61	72
Other comprehensive income (loss), after tax						(16)	37
Ending Balance	[3]	(703)				(719)	(703)	(740)
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance					$ (565)	(569)	(565)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax						(401)	(57)
Other Comprehensive Income Reclassifications Current Period Net of Tax						61	53
Other comprehensive income (loss), after tax						(340)	(4)	211
Ending Balance		$ (569)				$ (909)	(569)	$ (565)
Corporate, Non-Segment [Member] | Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Recognized Net Gain Loss Due to Settlements							$ 22

[1] Included a tax expense of $6 as of August 2, 2015, $7 as of August 3, 2014, and $9 as of July 28, 2013. 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 $5 as of August 2, 2015, $1 as of August 3, 2014, and a tax expense of $3 as of July 28, 2013.

[3] Included a tax benefit of $417 as of August 2, 2015, $405 as of August 3, 2014, and $424 as of July 28, 2013. The amount reclassified in 2014 from other comprehensive income included pre-tax settlement charges of $22, or $14 after tax.