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Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings      
Income from continuing operations, net of tax $ 2,365 $ 1,737 $ 2,085
Less: Preferred stock dividends 21 21 21
Net income available to common stockholders $ 2,344 $ 1,716 $ 2,064
Shares      
Weighted average common shares outstanding, basic 349.1 358.3 360.9
Dilutive effect of warrants [1] 0.0 0.0 0.5
Dilutive effect of stock-based awards under compensation plans 5.0 2.3 3.5
Weighted average common shares outstanding and dilutive potential common shares [2] 354.1 360.6 364.9
Basic      
Net income available to common stockholders $ 6.71 $ 4.79 $ 5.72
Diluted      
Net income available to common stockholders $ 6.62 $ 4.76 $ 5.66