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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator:        
Net income, basic $ 511 $ 872 $ 2,330 $ 2,179
Net income, diluted $ 511 $ 872 $ 2,330 $ 2,179
Denominator:        
Basic: Weighted-average common shares outstanding (in shares) 100,400,000 104,900,000 101,600,000 106,400,000
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares) 1,800,000 2,200,000 1,800,000 2,100,000
Diluted: Weighted-average common shares outstanding (in shares) 102,200,000 107,100,000 103,400,000 108,500,000
Earnings per share:        
Basic (in dollars per share) $ 5.09 $ 8.31 $ 22.93 $ 20.48
Diluted (in dollars per share) $ 5.00 $ 8.14 $ 22.53 $ 20.08
Options excluded from earnings per share calculation due to their anti-dilutive effect (in shares) 0 0 0 200,000