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Shareholders' Equity (Deficit) (Dividends Paid) (Details) - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 3 Months Ended 12 Months Ended
Mar. 22, 2018
Feb. 03, 2018
Oct. 28, 2017
Jul. 29, 2017
Apr. 29, 2017
Jan. 28, 2017
Oct. 29, 2016
Jul. 30, 2016
Apr. 30, 2016
Jan. 30, 2016
Oct. 31, 2015
Aug. 01, 2015
May 02, 2015
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Common Stock, Dividends, Per Share, Cash Paid   $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 2.40 $ 2.40 $ 2.00
Special Dividend To Common Stockholders Per Share Paid   0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.00 0.00 2.00 2.00
Total Dividends Per Share Cash Paid   $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 2.60 $ 0.50 $ 0.50 $ 0.50 $ 2.50 $ 2.40 $ 4.40 $ 4.00
Payments of Dividends   $ 170 $ 172 $ 172 $ 172 $ 172 $ 173 $ 173 $ 750 $ 145 $ 146 $ 146 $ 734 $ 686 $ 1,268 $ 1,171
Common Stock, Dividends, Per Share, Declared                           $ 2.40 $ 4.40 $ 4.00
Subsequent Event [Member]                                
Common Stock, Dividends, Per Share, Declared $ 0.60