Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 27, 2013		Oct. 28, 2012	Jul. 28, 2013
Total Accumulated other comprehensive loss	$ (506)			$ (565)
Other comprehensive income (loss), after tax	58		31
Accumulated Other Comprehensive Income Foreign Currency Translation Tax (Benefit) Expense	11			9
Accumulated Other Comprehensive Income Cashflow Hedges Tax (Benefit) Expense	(2)			(3)
Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax (Benefit) Expense	(416)			(424)
Accumulated Translation Adjustment [Member]
Total Accumulated other comprehensive loss	217	[1]		170	[1]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax	47
Other Comprehensive Income Reclassifications Current Period Net of Tax	0
Other comprehensive income (loss), after tax	47
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Total Accumulated other comprehensive loss	3	[2]		5	[2]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax	(2)
Other Comprehensive Income Reclassifications Current Period Net of Tax	0
Other comprehensive income (loss), after tax	(2)
Accumulated Defined Benefit Plans Adjustment [Member]
Total Accumulated other comprehensive loss	(726)	[3]		(740)	[3]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax	0
Other Comprehensive Income Reclassifications Current Period Net of Tax	14
Other comprehensive income (loss), after tax	14
Accumulated Other Comprehensive Income (Loss) [Member]
Total Accumulated other comprehensive loss	(506)			(565)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax	45
Other Comprehensive Income Reclassifications Current Period Net of Tax	14
Other comprehensive income (loss), after tax	$ 59		$ 31

[1] Included a tax expense of $11 as of October 27, 2013, and $9 as of July 28, 2013. The amount related to noncontrolling interests was not material.

[2] Included a tax expense of $2 as of October 27, 2013, and $3 as of July 28, 2013.

[3] Included a tax benefit of $416 as of October 27, 2013, and $424 as of July 28, 2013.