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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic        
Net income (loss) attributable to stockholders $ 2,836 $ (758) $ 5,858 $ (464)
Less: cumulative dividends on subsidiary preferred stock (46) (48) (91) (95)
Net income (loss) attributable to common stockholders $ 2,790 $ (806) $ 5,767 $ (559)
Weighted-average common shares outstanding - basic (in shares) 1,451 1,432 1,449 1,432
Basic earnings (loss) per common share (in dollars per share) $ 1.92 $ (0.56) $ 3.98 $ (0.39)
Diluted        
Net income (loss) attributable to common stockholders – diluted $ 2,790 $ (806) $ 5,767 $ (559)
Weighted-average common shares outstanding - basic (in shares) 1,451 1,432 1,449 1,432
Dilutive effect of warrants and awards under stock incentive plans (in shares) 17 0 17 0
Weighted-average common shares outstanding - diluted (in shares) 1,468 1,432 1,466 1,432
Diluted earnings (loss) per common share (in dollars per share) $ 1.90 $ (0.56) $ 3.93 $ (0.39)
Potentially dilutive securities (in shares) 2 43 2 43