Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jan. 26, 2014		Jan. 27, 2013	Jan. 26, 2014		Jan. 27, 2013	Jul. 28, 2013
Total Accumulated other comprehensive loss	$ (616)			$ (616)			$ (565)
Other comprehensive income (loss), after tax	(110)		45	(52)		76
Accumulated Other Comprehensive Income Foreign Currency Translation Tax (Benefit) Expense	7			7			9
Accumulated Other Comprehensive Income Cashflow Hedges Tax (Benefit) Expense	(3)			(3)			(3)
Accumulated Other Comprehensive Income Unamortized Pension And Post Retirement Tax (Benefit) Expense	(406)			(406)			(424)
Accumulated Translation Adjustment [Member]
Total Accumulated other comprehensive loss	82	[1]		82	[1]		170	[1]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				(69)
Other Comprehensive Income Reclassifications Current Period Net of Tax				(19)
Other comprehensive income (loss), after tax				(88)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Total Accumulated other comprehensive loss	6	[2]		6	[2]		5	[2]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				1
Other Comprehensive Income Reclassifications Current Period Net of Tax				0
Other comprehensive income (loss), after tax				1
Accumulated Defined Benefit Plans Adjustment [Member]
Total Accumulated other comprehensive loss	(704)	[3]		(704)	[3]		(740)	[3]
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				6
Other Comprehensive Income Reclassifications Current Period Net of Tax				30
Other comprehensive income (loss), after tax				36
Accumulated Other Comprehensive Income (Loss) [Member]
Total Accumulated other comprehensive loss	(616)			(616)			(565)
Other Comprehensive Income (Loss) Before Reclassifications Net Of Tax				(62)
Other Comprehensive Income Reclassifications Current Period Net of Tax				11
Other comprehensive income (loss), after tax				$ (51)		$ 76

[1] Included a tax expense of $7 as of January 26, 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.

[2] Included a tax expense of $3 as of January 26, 2014, and July 28, 2013.

[3] Included a tax benefit of $406 as of January 26, 2014, and $424 as of July 28, 2013