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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Basic earnings per share        
Net income (loss) attributable to stockholders $ 3,056 $ 3,064 $ 8,969 $ 8,026
Less: cumulative dividends on subsidiary preferred stock (27) (26) (55) (80)
Net income (loss) attributable to common stockholders $ 3,029 $ 3,038 $ 8,914 $ 7,946
Weighted-average common shares outstanding - basic (in shares) 1,116 1,372 1,136 1,384
Basic earnings per common share (in dollars per share) $ 2.71 $ 2.21 $ 7.85 $ 5.74
Diluted earnings per share        
Net income (loss) attributable to common stockholders – diluted $ 3,029 $ 3,038 $ 8,914 $ 7,946
Weighted-average common shares outstanding - basic (in shares) 1,116 1,372 1,136 1,384
Dilutive effect of awards under stock incentive plans (in shares) 15 6 11 6
Weighted-average common shares outstanding - diluted (in shares) 1,131 1,378 1,147 1,390
Diluted earnings per common share (in dollars per share) $ 2.68 $ 2.20 $ 7.77 $ 5.72
Potentially dilutive securities (in shares) 6 14 6 14