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Earnings per share - Schedule of Computation for Basic and Diluted Earnings (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income (Numerator):        
Net income for basic and diluted EPS $ 3,216 $ 2,830 $ 6,378 $ 3,463
Shares (Denominator):        
Weighted-average shares for basic EPS (in shares) 538 537 538 537
Effect of dilutive securities (in shares) 4 5 4 4
Weighted-average shares for diluted EPS (in shares) 542 542 542 541
Basic earnings per share (in usd per share) $ 5.98 $ 5.27 $ 11.86 $ 6.45
Diluted earnings per share (in usd per share) $ 5.93 $ 5.22 $ 11.77 $ 6.40