v3.26.1
Stockholders' equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance, beginning   $ 16,273     $ 16,273  
Net income $ 1,980   $ 1,295   3,525 $ 2,474
Other comprehensive income (loss), net of taxes 1   $ (9)   2 (16)
Balance, ending $ 18,007       18,007  
Cash dividends declared per common share (in dollars per share) $ 1.42 $ 1.42 $ 1.36 $ 1.36    
Cash dividends paid per common share (in dollars per share) $ 1.42 $ 1.42 $ 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
Balance, ending 1,741 1,741 1,741 1,741 1,741 1,741
Paid-in Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance, beginning 4,722 4,511 4,058 3,935 4,511 3,935
Common stock issued for stock-based awards 279 105 59 8    
Stock compensation 127 109 129 116    
Other 1 (3) (1) (1)    
Balance, ending 5,129 4,722 4,245 4,058 5,129 4,245
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance, beginning 52,483 52,236 52,196 52,262 52,236 52,262
Net income 1,980 1,545 1,295 1,179    
Dividends declared and paid (1,295) (1,291) (1,235) (1,238)    
Dividend equivalents on RSUs (7) (8) (7) (7)    
Other   1        
Balance, ending 53,161 52,483 52,249 52,196 53,161 52,249
Treasury Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance, beginning (42,084) (42,130) (41,442) (40,895) (42,130) (40,895)
Common stock issued for stock-based awards 166 204 56 110    
Stock repurchases (23) (158) (290) (657)    
Balance, ending (41,941) (42,084) (41,676) (41,442) (41,941) (41,676)
AOCI            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance, beginning (84) (85) (147) (140) (85) (140)
Other comprehensive income (loss), net of taxes 1 1 (9) (7)    
Balance, ending $ (83) $ (84) $ (156) $ (147) $ (83) $ (156)