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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, 2023
USD ($)
shares
$ / shares
Dec. 31, 2022
USD ($)
shares
$ / shares
Number of shares    
Unvested shares at January 1 (in shares) | shares 4,793 5,627
Vested (in shares) | shares (1,985) (2,447)
Forfeited (in shares) | shares (191) (358)
Unvested shares at December 31 (in shares) | shares 4,942 4,793
Weighted average fair value at grant date    
Outstanding, beginning balance, weighted average fair value at grant date (in dollars per share) | $ / shares $ 69.16 $ 60.96
Vested, weighted average fair value at grant date (in dollars per share) | $ / shares 65.70 55.48
Forfeited, weighted average fair value at grant date (in dollars per share) | $ / shares 73.66 71.74
Outstanding, ending balance, weighted average fair value at grant date (in dollars per share) | $ / shares $ 71.82 $ 69.16
Fair value at grant date    
Fair value, beginning balance, unvested | $ $ 331 $ 343
Fair value, vested | $ (130) (136)
Fair value, forfeited | $ (14) (26)
Fair value, ending balance, unvested | $ $ 355 $ 331
Restricted awards    
Number of shares    
Granted (in shares) | shares 1,627 1,453
Weighted average fair value at grant date    
Granted, weighted average fair value at grant date (in dollars per share) | $ / shares $ 72.30 $ 76.61
Fair value at grant date    
Fair value, granted | $ $ 118 $ 111
Performance awards    
Number of shares    
Granted (in shares) | shares 698 518
Weighted average fair value at grant date    
Granted, weighted average fair value at grant date (in dollars per share) | $ / shares $ 72.06 $ 74.48
Fair value at grant date    
Fair value, granted | $ $ 50 $ 39