v3.26.3
Stockholders' equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance, beginning     $ 16,273       $ 16,273  
Net income $ 2,425     $ 1,364     5,950 $ 3,838
Other comprehensive income (loss), net of taxes (2)     $ 7     0 (9)
Balance, ending $ 19,185           19,185  
Cash dividends declared per common share (in dollars per share) $ 1.42 $ 1.42 $ 1.42 $ 1.36 $ 1.36 $ 1.36    
Cash dividends paid per common share (in dollars per share) $ 1.42 $ 1.42 $ 1.42 $ 1.36 $ 1.36 $ 1.36    
Common Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance, beginning $ 1,741 $ 1,741 $ 1,741 $ 1,741 $ 1,741 $ 1,741 1,741 1,741
Balance, ending 1,741 1,741 1,741 1,741 1,741 1,741 1,741 1,741
Paid-in Capital                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance, beginning 5,129 4,722 4,511 4,245 4,058 3,935 4,511 3,935
Common stock issued for stock-based awards (20) 279 105 72 59 8    
Stock compensation 95 127 109 93 129 116    
Other (2) 1 (3)   (1) (1)    
Balance, ending 5,202 5,129 4,722 4,410 4,245 4,058 5,202 4,410
Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance, beginning 53,161 52,483 52,236 52,249 52,196 52,262 52,236 52,262
Net income 2,425 1,980 1,545 1,364 1,295 1,179    
Dividends declared and paid (1,298) (1,295) (1,291) (1,236) (1,235) (1,238)    
Dividend equivalents on RSUs (6) (7) (8) (7) (7) (7)    
Other     1 (1)        
Balance, ending 54,282 53,161 52,483 52,369 52,249 52,196 54,282 52,369
Treasury Common Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance, beginning (41,941) (42,084) (42,130) (41,676) (41,442) (40,895) (42,130) (40,895)
Common stock issued for stock-based awards 36 166 204 53 56 110    
Stock repurchases (50) (23) (158) (121) (290) (657)    
Balance, ending (41,955) (41,941) (42,084) (41,744) (41,676) (41,442) (41,955) (41,744)
AOCI                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Balance, beginning (83) (84) (85) (156) (147) (140) (85) (140)
Other comprehensive income (loss), net of taxes (2) 1 1 7 (9) (7)    
Balance, ending $ (85) $ (83) $ (84) $ (149) $ (156) $ (147) $ (85) $ (149)