Shareholders' Equity (Deficit) (Dividends Paid) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended			1 Months Ended
	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May 03, 2014	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	May 04, 2013	Feb. 02, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 28, 2012	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013	Mar. 05, 2015
Common Stock, Dividends, Per Share, Cash Paid	$ 0.34	$ 0.34	$ 0.34	$ 0.34	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 1.36	$ 1.20	$ 1.00
Special Dividend To Common Stockholders Per Share Paid	$ 0.00	$ 0.00	$ 0.00	$ 1.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 3.00	$ 1.00	$ 0.00	$ 0.00	$ 0	$ 0.00	$ 4.00
Total Dividends Per Share Cash Paid	$ 0.34	$ 0.34	$ 0.34	$ 1.34	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 3.25	$ 1.25	$ 0.25	$ 0.25	$ 2.36	$ 1.20	$ 5.00
Dividends Paid	$ 100	$ 100	$ 99	$ 392	$ 88	$ 87	$ 87	$ 87	$ 942	$ 361	$ 73	$ 73	$ 691	$ 349	$ 1,449
Common Stock, Dividends, Per Share, Declared													$ 2.36	$ 1.20	$ 5.00
Dividend Declared [Member]
Dividends Paid																$ 731
Common Stock, Dividends, Per Share, Declared													$ 0.34			$ 0.50
Special Dividends Per Share Declared																$ 2