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Capital Transactions - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 06, 2020
May 09, 2019
Feb. 12, 2019
May 09, 2018
Feb. 08, 2018
May 26, 2017
May 10, 2017
Feb. 09, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]                      
Dividends per common share (in dollars per share)     $ 0.37   $ 0.34     $ 0.30 $ 0.37 $ 0.34 $ 0.30
Cash dividend payment   $ 283   $ 259     $ 226   $ 283 $ 259 $ 226
Dividend equivalent payment           $ 0          
Subsequent Events                      
Class of Stock [Line Items]                      
Dividends per common share (in dollars per share) $ 0.41