Shareholders' Equity (Dividends Paid) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	2 Months Ended	3 Months Ended												12 Months Ended
	Mar. 22, 2013	Feb. 02, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 28, 2012	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 31, 2010	May 01, 2010	Feb. 02, 2013	Jan. 28, 2012	Jan. 29, 2011
Common Stock, Dividends, Per Share, Declared														$ 5.00	$ 3.80	$ 4.60
Common Stock, Dividends, Per Share, Cash Paid		$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 1	$ 0.8	$ 0.6
Special Dividend To Common Stockholders Per Share Paid		$ 3.00	$ 1.00	$ 0.00	$ 0.00	$ 2.00	$ 0.00	$ 1.00	$ 0.00	$ 3.00	$ 0.00	$ 0.00	$ 1.00	$ 4	$ 3	$ 4
Total Dividends Per Share Cash Paid		$ 3.25	$ 1.25	$ 0.25	$ 0.25	$ 2.2	$ 0.2	$ 1.2	$ 0.2	$ 3.15	$ 0.15	$ 0.15	$ 1.15	$ 5	$ 3.8	$ 4.6
Dividends Paid		$ 942	$ 361	$ 73	$ 73	$ 653	$ 60	$ 367	$ 64	$ 1,017	$ 49	$ 49	$ 373	$ 1,449	$ 1,144	$ 1,488
Dividend Increase Amount	$ 0.05
Dividend Declared [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.30