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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
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Income (loss) from continuing operations, net of tax $ (1,340) $ 1,410
Income from discontinued operations, net of tax 0 2
Net income (loss) (1,340) 1,412
Dividends and undistributed earnings allocated to participating securities (3) (12)
Preferred stock dividends (55) (52)
Issuance cost for redeemed preferred stock (22) 0
Net income (loss) available to common stockholders $ (1,420) $ 1,348
Total weighted-average basic shares outstanding 457.6 469.4
Effect of dilutive securities:    
Stock options 0.0 1.1
Other contingently issuable shares 0.0 1.1
Total effect of dilutive securities 0.0 2.2
Total weighted-average diluted shares outstanding 457.6 471.6
Basic earnings per common share:    
Net income (loss) from continuing operations (in dollars per share) $ (3.10) $ 2.87
Net income (loss) per basic common share (in dollars per share) (3.10) 2.87
Diluted earnings per common share:    
Net income (loss) from continuing operations (in dollars per share) (3.10) 2.86
Net income (loss) per diluted common share (in dollars per share) $ (3.10) $ 2.86