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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Basic    
Net income attributable to stockholders $ 294 $ 2,157
Less: cumulative dividends on subsidiary preferred stock (47) (38)
Net income attributable to common stockholders $ 247 $ 2,119
Weighted-average common shares outstanding - basic (in shares) 1,433 1,417
Basic earnings per common share (in dollars per share) $ 0.17 $ 1.50
Diluted    
Net income attributable to common stockholders – diluted $ 247 $ 2,119
Weighted-average common shares outstanding - basic (in shares) 1,433 1,417
Dilutive effect of warrants and awards under stock incentive plans (in shares) 7 19
Weighted-average common shares outstanding - diluted (in shares) 1,440 1,436
Diluted earnings per common share (in dollars per share) $ 0.17 $ 1.48
Potentially dilutive securities (in shares) 32 8