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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
Numerator:        
Net income, basic $ 829 $ 890 $ 1,819 $ 1,307
Net income, diluted $ 829 $ 890 $ 1,819 $ 1,307
Denominator:        
Basic: Weighted-average common shares outstanding (in shares) 101.6 106.4 102.2 107.1
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares) 1.8 2.0 1.8 2.1
Diluted: Weighted-average common shares outstanding (in shares) 103.4 108.4 104.0 109.2
Earnings per share:        
Basic (in dollars per share) $ 8.16 $ 8.36 $ 17.80 $ 12.20
Diluted (in dollars per share) $ 8.02 $ 8.21 $ 17.49 $ 11.97
Options excluded from earnings per share calculation due to their anti-dilutive effect (in shares) 0.0 0.0 0.1 0.2