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Stockholders' equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Class of Stock [Line Items]                                
Stock repurchases (in shares)                           700,000 0 26,100,000
Stock repurchases                           $ 200   $ 6,300
Amount available for stock repurchases under a board approved stock repurchase plan $ 6,800                         $ 6,800    
Common stock, dividends declared per share (in usd per share) $ 2.38 $ 2.25 $ 2.25 $ 2.25 $ 2.25 $ 2.13 $ 2.13 $ 2.13 $ 2.13 $ 1.94 $ 1.94 $ 1.94 $ 1.94 $ 9.13 $ 8.64 $ 7.95
Income taxes expense (benefit) for unrealized gains and losses for cash flow hedges                           $ 105 $ 6 $ 19
Income taxes expense or (benefit) for unrealized gains and losses for cash flow hedges and related reclassifications                           $ (25) $ (50) $ 0
Preferred stock shares authorized (in shares) 5,000,000                         5,000,000    
Preferred stock, par value (in usd per share) $ 0.0001                         $ 0.0001    
Preferred stock, shares outstanding (in shares) 0       0                 0 0  
Preferred stock, shares issued (in shares) 0       0                 0 0  
Accelerated stock repurchase agreement                                
Class of Stock [Line Items]                                
Stock repurchases (in shares)                               24,800,000