v3.25.2
Stockholders' equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance, beginning   $ 16,903     $ 16,903  
Net income $ 1,295   $ 1,127   2,474 $ 2,232
Other comprehensive income (loss), net of taxes (9)   $ 3   (16) 5
Balance, ending $ 16,403       16,403  
Cash dividends declared per common share (in dollars per share) $ 1.36 $ 1.36 $ 1.30 $ 1.30    
Cash dividends paid per common share (in dollars per share) $ 1.36 $ 1.36 $ 1.30 $ 1.30    
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 4,058 3,935 3,439 3,362 3,935 3,362
Common stock issued for stock-based awards 59 8 111 (29)    
Stock compensation 129 116 116 106    
Other (1) (1)   0    
Balance, ending 4,245 4,058 3,666 3,439 4,245 3,666
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance, beginning 52,196 52,262 52,199 52,283 52,262 52,283
Net income 1,295 1,179 1,127 1,105    
Dividends declared and paid (1,235) (1,238) (1,185) (1,183)    
Dividend equivalents on RSUs (7) (7) (6) (7)    
Other       1    
Balance, ending 52,249 52,196 52,135 52,199 52,249 52,135
Treasury Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance, beginning (41,442) (40,895) (40,193) (40,284) (40,895) (40,284)
Common stock issued for stock-based awards 56 110 137 94    
Stock repurchases (290) (657) (72) (3)    
Balance, ending (41,676) (41,442) (40,128) (40,193) (41,676) (40,128)
AOCI            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance, beginning (147) (140) (203) (205) (140) (205)
Other comprehensive income (loss), net of taxes (9) (7) 3 2    
Balance, ending $ (156) $ (147) $ (200) $ (203) $ (156) $ (200)