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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings                      
Income from continuing operations, net of tax                 $ 1,737 $ 2,085 $ 1,485
Preferred Stock Dividends, Income Statement Impact                 21 21 6
Income loss from Continuing Operations Net of Tax Available to Common Shareholders                 1,716 2,064 1,479
Income from discontinued operations, net of tax, available to common stockholders                 0 0 322
Net income available to common stockholders $ 532 $ 453 $ 463 $ 268 $ 543 $ 524 $ 372 $ 625 $ 1,716 $ 2,064 $ 1,801
Shares                      
Weighted average common shares outstanding, basic                 358.3 360.9 358.4
Dilutive effect of warrants [1]                 0.0 0.5 1.9
Dilutive effect of stock-based awards under compensation plans                 2.3 3.5 3.8
Weighted average common shares outstanding and dilutive potential common shares [2]                 360.6 364.9 364.1
Basic                      
Income from continuing operations, net of tax, available to common stockholders                 $ 4.79 $ 5.72 $ 4.13
Income from discontinued operations, net of tax, available to common stockholders                 0 0 0.90
Net income available to common stockholders $ 1.48 $ 1.26 $ 1.29 $ 0.75 $ 1.51 $ 1.45 $ 1.03 $ 1.74 4.79 5.72 5.03
Diluted                      
Income from continuing operations, net of tax, available to common stockholders                 4.76 5.66 4.06
Income from discontinued operations, net of tax, available to common stockholders                 0 0 0.89
Net income available to common stockholders $ 1.47 $ 1.26 $ 1.29 $ 0.74 $ 1.49 $ 1.43 $ 1.02 $ 1.71 $ 4.76 $ 5.66 $ 4.95