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Capital Transactions (Details 2) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 02, 2017
May 27, 2016
May 11, 2016
Feb. 02, 2016
Mar. 31, 2017
Mar. 31, 2016
Dividends            
Dividends per common share (in dollars per share) $ 0.30     $ 0.26 $ 0.30 $ 0.26
Dividends Payable         $ 226 $ 195
Cash dividend payment     $ 192      
Dividend equivalent payment   $ 3