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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator (basic and diluted):      
Net income $ 1,057 $ 1,791 $ 1,721
Less: Preferred stock dividends 107 73 29
Net income available to common stockholders $ 950 $ 1,718 $ 1,692
Denominator:      
Weighted-average common shares outstanding - basic (in shares) 427,062,537 449,731,453 478,822,072
Dilutive common shares: share-based awards (in shares) 1,095,243 1,482,248 1,608,669
Weighted-average common shares outstanding - diluted (in shares) 428,157,780 451,213,701 480,430,741
Earnings per common share:      
Basic (in dollars per share) $ 2.22 $ 3.82 $ 3.54
Diluted (in dollars per share) $ 2.22 $ 3.81 $ 3.52
Antidilutive securities (in shares) 1,338,130 783 0