Repurchase of Common Stock (Details) (USD $) In Millions	1 Months Ended	3 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2007 June 2007 share repurchase program	Aug. 27, 2011 June 2007 share repurchase program	Aug. 28, 2010 June 2007 share repurchase program	Aug. 27, 2011 June 2007 share repurchase program	Aug. 28, 2010 June 2007 share repurchase program	Jun. 30, 2011 June 2011 share repurchase program	Aug. 27, 2011 June 2011 share repurchase program	Aug. 28, 2010 June 2011 share repurchase program	Aug. 27, 2011 June 2011 share repurchase program	Aug. 28, 2010 June 2011 share repurchase program
Repurchases of common stock
Stock Repurchase Program, Authorized Amount	$ 5,500					$ 5,000
Amount remained available for future repurchases									4,748
Common stock repurchased and retired (in shares)		3.6	17.3	20.1	19.8		9.1	0	9.1	0
Common stock repurchased and retired		$ 106	$ 594	$ 611	$ 705		$ 252	$ 0	$ 252	$ 0