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Profit Per Share - Computations of profit per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share Reconciliation [Abstract]    
Profit for the period (A) (in dollars) [1] $ 2,003 $ 2,856
Determination of shares (in millions):    
Weighted-average number of common shares outstanding (B) (in shares) 474.9 493.9
Shares issuable on exercise of stock awards, net of shares assumed to be purchased out of proceeds at average market price (in shares) 2.2 3.0
Average common shares outstanding for fully diluted computation (C) (in shares) [2] 477.1 496.9
Profit per share of common stock:    
Assuming no dilution (A/B) (in dollars per share) $ 4.22 $ 5.78
Assuming full dilution (A/C) (in dollars per share) [2] $ 4.20 $ 5.75
Shares outstanding as of end of period (in shares) 471.0 489.3
[1] Profit attributable to common shareholders.
[2] Diluted by assumed exercise of stock-based compensation awards using the treasury stock method.