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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Basic        
Net income (loss) attributable to stockholders $ (758) $ 2,418 $ (464) $ 4,575
Less: cumulative dividends on subsidiary preferred stock (48) (37) (95) (75)
Net income (loss) attributable to common stockholders $ (806) $ 2,381 $ (559) $ 4,500
Weighted-average common shares outstanding - basic (in shares) 1,432 1,420 1,432 1,419
Basic earnings (loss) per common share (in dollars per share) $ (0.56) $ 1.68 $ (0.39) $ 3.17
Diluted        
Net income (loss) attributable to common stockholders – diluted $ (806) $ 2,381 $ (559) $ 4,500
Weighted-average common shares outstanding - basic (in shares) 1,432 1,420 1,432 1,419
Dilutive effect of warrants and awards under stock incentive plans (in shares) 0 18 0 18
Weighted-average common shares outstanding - diluted (in shares) 1,432 1,438 1,432 1,437
Diluted earnings (loss) per common share (in dollars per share) $ (0.56) $ 1.66 $ (0.39) $ 3.13
Potentially dilutive securities (in shares) 43 7 43 7