Consolidated Statements Of Equity (USD $) In Millions, except Per Share data	Total	Capital Stock Issued [Member]	Capital Stock In Treasury [Member]	Additional Paid-In Capital [Member]	Earnings Retained In The Business [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance, value at Jul. 31, 2011	$ 1,096	$ 20	$ (8,021)	$ 331	$ 9,185	$ (427)	$ 8
Balance, shares at Jul. 31, 2011		542	(222)
Net earnings (loss)	639				647		(8)
Other comprehensive income (loss)	(58)					(58)	0
Dividends	(282)				(282)
Dividends per share	$ 0.87
Treasury stock purchased, shares			(8)
Treasury stock purchased, value	(272)		(272)
Treasury stock issued under management incentive and stock option plans, shares			4
Treasury stock issued under management incentive and stock option plans, value	149		149	0
Balance, value at Apr. 29, 2012	1,272	20	(8,144)	331	9,550	(485)	0
Balance, shares at Apr. 29, 2012		542	(226)
Balance, value at Jul. 29, 2012	898	20	(8,259)	329	9,584	(776)	0
Balance, shares at Jul. 29, 2012		542	(230)
Contribution from noncontrolling interest	3						3
Net earnings (loss)	609				616		(7)
Other comprehensive income (loss)	67					67	0
Dividends	(279)				(279)
Dividends per share	$ 0.87
Treasury stock purchased, shares			(4)
Treasury stock purchased, value	(139)		(139)
Treasury stock retired, shares	219	(219)	219
Treasury stock retired, value	0	(8)	7,907		(7,899)
Treasury stock issued under management incentive and stock option plans, shares			4
Treasury stock issued under management incentive and stock option plans, value	154		126	28
Balance, value at Apr. 28, 2013	$ 1,313	$ 12	$ (365)	$ 357	$ 2,022	$ (709)	$ (4)
Balance, shares at Apr. 28, 2013		323	(11)