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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
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Income from continuing operations, net of tax $ 2,406 $ 1,329 $ 149 $ 4,355
Income (loss) from discontinued operations, net of tax 0 4 (1) 15
Net income 2,406 1,333 148 4,370
Dividends and undistributed earnings allocated to participating securities (20) (10) (5) (34)
Preferred stock dividends (67) (53) (212) (185)
Issuance cost for redeemed preferred stock 0 0 (22) 0
Net income (loss) available to common stockholders $ 2,319 $ 1,270 $ (91) $ 4,151
Total weighted-average basic shares outstanding 457.8 469.5 457.4 469.9
Effect of dilutive securities:        
Stock options 0.4 1.3 0.0 1.2
Other contingently issuable shares 0.3 1.0 0.0 1.0
Total effect of dilutive securities 0.7 2.3 0.0 2.2
Total weighted-average diluted shares outstanding 458.5 471.8 457.4 472.1
Basic earnings per common share:        
Net income (loss) from continuing operations (in dollars per share) $ 5.07 $ 2.70 $ (0.20) $ 8.80
Income from discontinued operations 0.00 0.01 0.00 0.03
Net income (loss) per basic common share (in dollars per share) 5.07 2.71 (0.20) 8.83
Diluted earnings per common share:        
Net income (loss) from continuing operations (in dollars per share) 5.06 2.68 (0.20) 8.76
Income from discontinued operations (in dollars per share) 0.00 0.01 0.00 0.03
Net income (loss) per diluted common share (in dollars per share) $ 5.06 $ 2.69 $ (0.20) $ 8.79