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Capital Transactions (Details 2) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 02, 2016
May. 29, 2015
May. 13, 2015
Feb. 03, 2015
May. 30, 2014
May. 14, 2014
Feb. 06, 2014
May. 31, 2013
May. 15, 2013
Feb. 07, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dividends Payable [Line Items]                          
Dividends per common share (in dollars per share)       $ 0.23     $ 0.20     $ 0.19 $ 0.23 $ 0.20 $ 0.19
Cash dividend payment     $ 167     $ 143     $ 212   $ 170 $ 147 $ 216
Dividend equivalent payment   $ 3     $ 4     $ 4          
Subsequent Events                          
Dividends Payable [Line Items]                          
Dividends per common share (in dollars per share) $ 0.26