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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income $ 502 $ 368
Preferred stock dividends (55) (49)
Dividends and undistributed earnings allocated to participating securities (1) 0
Net income available to common shareholders $ 446 $ 319
Basic average common shares 381,224 399,421
Effect of dilutive securities: common stock options and common stock awards (in shares) 5,193 4,194
Diluted average common shares 386,417 403,615
Anti-dilutive securities (in shares) 580 3,920
Earnings per Common Share:    
Basic (in USD per share) $ 1.17 $ 0.80
Diluted (in USD per share) $ 1.15 $ 0.79