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Capital Transactions - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 01, 2018
May 26, 2017
May 10, 2017
Feb. 02, 2017
May 27, 2016
May 11, 2016
Feb. 02, 2016
May 29, 2015
May 13, 2015
Feb. 03, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]                          
Dividends per common share (in dollars per share)       $ 0.30     $ 0.26     $ 0.23 $ 0.30 $ 0.26 $ 0.23
Cash dividend payment     $ 226     $ 192     $ 167   $ 226 $ 195 $ 170
Dividend equivalent payment   $ 0     $ 3     $ 3          
Subsequent Events                          
Class of Stock [Line Items]                          
Dividends per common share (in dollars per share) $ 0.34