Earnings Per Share And Shareholders' Equity (Dividends) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jul. 28, 2012	Apr. 28, 2012	Jul. 30, 2011	Apr. 30, 2011	Jul. 28, 2012	Jul. 30, 2011
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.25	$ 0.25	$ 0.2	$ 0.2	$ 0.5	$ 0.4
Special Dividend To Common Stockholders Per Share Paid	$ 0	$ 0	$ 1	$ 0	$ 0	$ 1
Total Dividends Per Share Cash Paid	$ 0.25	$ 0.25	$ 1.2	$ 0.2	$ 0.5	$ 1.4
Payments of Ordinary Dividends, Common Stock	$ 73	$ 73	$ 367	$ 64	$ 146	$ 431
Dividend Declared [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.25
Special Dividend To Common Stockholders Per Share Paid	$ 1
Payments of Dividends	$ 290