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Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]      
Income from continuing operations, net of tax $ 5,533 $ 6,025 $ 2,117
Income (loss) from discontinued operations, net of tax 13 (10) (135)
Net income 5,546 6,015 1,982
Dividends and undistributed earnings allocated to participating securities (41) (40) (13)
Preferred stock dividends (282) (265) (265)
Issuance cost for redeemed preferred stock (31) 0 0
Net income available to common stockholders $ 5,192 $ 5,710 $ 1,704
Total weighted-average basic shares outstanding 467.6 479.9 484.2
Effect of dilutive securities:      
Stock options 1.3 1.6 2.5
Other contingently issuable shares 1.0 1.1 1.2
Warrants 0.0 0.5 0.7
Total effect of dilutive securities 2.3 3.2 4.4
Total weighted-average diluted shares outstanding 469.9 483.1 488.6
Basic earnings per common share:      
Net income from continuing operations (in dollars per share) $ 11.07 $ 11.92 $ 3.80
Income (loss) from discontinued operations (in dollars per share) 0.03 (0.02) (0.28)
Net income per basic common share (in dollars per share) 11.10 11.90 3.52
Diluted earnings per common share:      
Net income from continuing operations (in dollars per share) 11.02 11.84 3.76
Income (loss) from discontinued operations (in dollars per share) 0.03 (0.02) (0.27)
Net income per diluted common share (in dollars per share) $ 11.05 $ 11.82 $ 3.49