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Equity-based compensation - Summary of non-vested share movements (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
shares
$ / shares
Dec. 31, 2023
USD ($)
shares
$ / shares
Number of shares    
Unvested shares (in shares) | shares 4,942 4,793
Vested (in shares) | shares (1,902) (1,985)
Forfeited (in shares) | shares (204) (191)
Unvested shares (in shares) | shares 5,167 4,942
Weighted average fair value at grant date    
Outstanding, beginning balance, weighted average fair value at grant date (in dollars per share) | $ / shares $ 71.82 $ 69.16
Vested, weighted average fair value at grant date (in dollars per share) | $ / shares 73.76 65.70
Forfeited, weighted average fair value at grant date (in dollars per share) | $ / shares 75.72 73.66
Outstanding, ending balance, weighted average fair value at grant date (in dollars per share) | $ / shares $ 74.63 $ 71.82
Fair value at grant date    
Fair value, beginning balance, unvested | $ $ 355 $ 331
Fair value, vested | $ (140) (130)
Fair value, forfeited | $ (15) (14)
Fair value, ending balance, unvested | $ $ 386 $ 355
Restricted awards    
Number of shares    
Granted (in shares) | shares 1,560 1,627
Weighted average fair value at grant date    
Granted, weighted average fair value at grant date (in dollars per share) | $ / shares $ 80.95 $ 72.30
Fair value at grant date    
Fair value, granted | $ $ 126 $ 118
Performance awards    
Number of shares    
Granted (in shares) | shares 771 698
Weighted average fair value at grant date    
Granted, weighted average fair value at grant date (in dollars per share) | $ / shares $ 77.99 $ 72.06
Fair value at grant date    
Fair value, granted | $ $ 60 $ 50