Repurchase of Common Stock (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended		1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2007 June 2007 share repurchase program	Nov. 03, 2012 June 2007 share repurchase program	Oct. 29, 2011 June 2007 share repurchase program	Nov. 03, 2012 June 2007 share repurchase program	Oct. 29, 2011 June 2007 share repurchase program	Sep. 30, 2011 June 2011 share repurchase program	Nov. 03, 2012 June 2011 share repurchase program	Oct. 29, 2011 June 2011 share repurchase program	Nov. 03, 2012 June 2011 share repurchase program	Oct. 29, 2011 June 2011 share repurchase program
Repurchases of common stock
Share repurchase program, authorized amount	$ 5,500					$ 5,000
Common stock repurchased and retired (in shares)		0	0	0	20.1		0	13.0	10.9	17.6
Common stock repurchased and retired		0	0	0	611		0	323	237	462
Amount remained available for future repurchases									$ 3,989