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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator (basic and diluted):        
Net income $ 530 $ 314 $ 1,789 $ 601
Less: Preferred stock dividends 26 25 81 75
Net income available to common stockholders $ 504 $ 289 $ 1,708 $ 526
Denominator:        
Weighted-average common shares outstanding - basic (in shares) 426,086,717 426,846,096 425,996,867 427,058,412
Dilutive common shares: share-based awards (in shares) 1,754,247 1,146,253 1,683,018 1,083,946
Weighted-average common shares outstanding - diluted (in shares) 427,840,964 427,992,349 427,679,885 428,142,358
Earnings per common share:        
Basic (in dollars per share) $ 1.18 $ 0.68 $ 4.01 $ 1.23
Diluted (in dollars per share) $ 1.18 $ 0.68 $ 3.99 $ 1.23
Share-based awards excluded from diluted earnings per share computation (in shares) 10,614 1,193,668 4,238 1,249,785