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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income $ 1,788 $ 1,671 $ 5,290 $ 4,985
Weighted-average number of shares outstanding:        
Weighted average number of shares - basic (in shares) 592.4 607.6 595.8 608.7
Weighted average number of shares - diluted (in shares) 593.2 608.6 596.7 609.7
Earnings per share - basic (in dollars per share) $ 3.02 $ 2.75 $ 8.88 $ 8.19
Earnings per share - diluted (in dollars per share) $ 3.01 $ 2.75 $ 8.87 $ 8.18
Stock options excluded as their inclusion would be anti-dilutive (in shares) 1.0 0.6 0.9 0.6
Stock options        
Weighted-average number of shares outstanding:        
Weighted-average number of shares outstanding, dilutive effect on shares 0.2 0.4 0.3 0.4
Retention awards        
Weighted-average number of shares outstanding:        
Weighted-average number of shares outstanding, dilutive effect on shares 0.6 0.6 0.6 0.6