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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
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings                      
Net income (loss) $ 771 $ 651 $ 547 $ 535 $ 592 $ 340 $ 444 $ 443 $ 2,504 $ 1,819 $ 2,371
Less: Preferred stock dividends 5 6 5 5 5 6 5 5 21 21 21
Net income available to common stockholders $ 766 $ 645 $ 542 $ 530 $ 587 $ 334 $ 439 $ 438 $ 2,483 $ 1,798 $ 2,350
Shares                      
Weighted average common shares outstanding, basic                 307.1 324.8 349.1
Dilutive effect of stock-based awards under compensation plans                 4.4 4.7 5.0
Weighted average common shares outstanding and dilutive potential common shares [1]                 311.5 329.5 354.1
Basic                      
Earnings Per Share, Basic $ 2.55 $ 2.12 $ 1.75 $ 1.69 $ 1.85 $ 1.04 $ 1.34 $ 1.32 $ 8.09 $ 5.54 $ 6.73
Diluted                      
Net income available to common stockholders $ 2.51 $ 2.09 $ 1.73 $ 1.66 $ 1.82 $ 1.02 $ 1.32 $ 1.30 $ 7.97 $ 5.46 $ 6.64