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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Basic earnings per share        
Net income (loss) attributable to stockholders $ 2,933 $ 2,566 $ 5,913 $ 4,962
Less: cumulative dividends on subsidiary preferred stock (15) (27) (24) (53)
Net income (loss) attributable to common stockholders $ 2,919 $ 2,540 $ 5,889 $ 4,908
Weighted-average common shares outstanding - basic (in shares) 1,136 1,385 1,145 1,390
Basic earnings per common share (in dollars per share) $ 2.57 $ 1.83 $ 5.14 $ 3.53
Diluted earnings per share        
Net income (loss) attributable to common stockholders – diluted $ 2,919 $ 2,540 $ 5,889 $ 4,908
Weighted-average common shares outstanding - basic (in shares) 1,136 1,385 1,145 1,390
Dilutive effect of awards under stock incentive plans (in shares) 11 4 9 5
Weighted-average common shares outstanding - diluted (in shares) 1,147 1,389 1,155 1,396
Diluted earnings per common share (in dollars per share) $ 2.55 $ 1.83 $ 5.10 $ 3.52
Potentially dilutive securities (in shares) 4 24 4 24