Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 28, 2013		Jul. 29, 2012		Jul. 31, 2011
Total Accumulated other comprehensive loss	$ (565)		$ (776)
Other comprehensive income (loss), after tax	210		(349)		309
Accumulated Other Comprehensive Income Foreign Currency Translation Tax (Benefit) Expense	9		12		4
Accumulated Other Comprehensive Income Cashflow Hedges Tax (Benefit) Expense	3		6		11
Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax (Benefit) Expense	(424)		(581)		(459)
Accumulated Translation Adjustment [Member]
Total Accumulated other comprehensive loss	170	[1]	261	[1]	396	[1]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax	(91)		(135)
Other Comprehensive Income Reclassifications Current Period Net of Tax	0
Other comprehensive income (loss), after tax	(91)		(135)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Total Accumulated other comprehensive loss	5	[2]	(10)	[2]	(20)	[2]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax	12		10
Other Comprehensive Income Reclassifications Current Period Net of Tax	3		0
Other comprehensive income (loss), after tax	15		10
Accumulated Defined Benefit Plans Adjustment [Member]
Total Accumulated other comprehensive loss	(740)	[3]	(1,027)	[3]	(803)	[3]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax	219		(277)
Other Comprehensive Income Reclassifications Current Period Net of Tax	68		53
Other comprehensive income (loss), after tax	287		(224)
Accumulated Other Comprehensive Income (Loss) [Member]
Total Accumulated other comprehensive loss	(565)		(776)		(427)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax	140		(402)
Other Comprehensive Income Reclassifications Current Period Net of Tax	71		53
Other comprehensive income (loss), after tax	$ 211		$ (349)		$ 309

[1] Included a tax expense of $9 as of July 28, 2013, $12 as of July 29, 2012, and $4 as of July 31, 2011. Amounts related to noncontrolling interests were not material.

[2] Included a tax expense of $3 as of July 28, 2013, and a tax benefit of $6 as of July 29, 2012 and $11 as of July 31, 2011.

[3] Included a tax benefit of $424 as of July 28, 2013, $581 as of July 29, 2012, and $459 as of July 31, 2011.