Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		1 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011	Nov. 30, 2012 Dividend Declared
Subsequent Events
Special cash dividend announced on common stock (in dollars per share)					$ 1.20
Estimated special cash dividend, amount					$ 102
Cash dividend announced on common stock (in dollars per share)	$ 0.20	$ 0.20	$ 0.60	$ 0.60	$ 0.20