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Earnings Per Share (Details) - 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
Basic        
Net income attributable to stockholders $ 4,045 $ 2,351 $ 3,581 $ 6,926
Less: cumulative dividends on subsidiary preferred stock (40) (38) (135) (113)
Net income attributable to common stockholders $ 4,005 $ 2,313 $ 3,446 $ 6,813
Weighted-average common shares outstanding - basic (in shares) 1,432 1,428 1,432 1,422
Basic earnings per common share (in dollars per share) $ 2.80 $ 1.62 $ 2.41 $ 4.79
Diluted        
Net income attributable to common stockholders – diluted $ 4,005 $ 2,313 $ 3,446 $ 6,813
Weighted-average common shares outstanding - basic (in shares) 1,432 1,428 1,432 1,422
Dilutive effect of warrants and awards under stock incentive plans (in shares) 7 14 7 17
Weighted-average common shares outstanding - diluted (in shares) 1,439 1,442 1,439 1,439
Diluted earnings per common share (in dollars per share) $ 2.78 $ 1.60 $ 2.40 $ 4.74
Potentially dilutive securities (in shares) 31 7 31 7