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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Basic    
Net income attributable to stockholders $ 3,022 $ 294
Less: cumulative dividends on subsidiary preferred stock (46) (47)
Net income attributable to common stockholders $ 2,976 $ 247
Weighted-average common shares outstanding - basic (in shares) 1,447 1,433
Basic earnings per common share (in dollars per share) $ 2.06 $ 0.17
Diluted    
Net income attributable to common stockholders – diluted $ 2,976 $ 247
Weighted-average common shares outstanding - basic (in shares) 1,447 1,433
Dilutive effect of warrants and awards under stock incentive plans (in shares) 17 7
Weighted-average common shares outstanding - diluted (in shares) 1,464 1,440
Diluted earnings per common share (in dollars per share) $ 2.03 $ 0.17
Potentially dilutive securities (in shares) 2 32