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Capital Transactions - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 04, 2021
May 06, 2020
Feb. 06, 2020
Mar. 31, 2021
Mar. 31, 2020
Dividends          
Dividends per common share (in dollars per share) $ 0.47   $ 0.41 $ 0.47 $ 0.41
Cash dividend payment   $ 316      
Dividends payable       $ 365