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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, 2022
USD ($)
shares
$ / shares
Dec. 31, 2021
USD ($)
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Unvested shares at January 1 (in shares) | shares 5,627 5,417
Vested (in shares) | shares (2,447) (1,258)
Forfeited (in shares) | shares (358) (417)
Unvested shares at December 31 (in shares) | shares 4,793 5,627
Outstanding, beginning balance, weighted average fair value at grant date (in dollars per share) | $ / shares $ 60.96 $ 54.90
Vested, weighted average fair value at grant date (in dollars per share) | $ / shares 55.48 50.94
Forfeited, weighted average fair value at grant date (in dollars per share) | $ / shares 71.74 62.50
Outstanding, ending balance, weighted average fair value at grant date (in dollars per share) | $ / shares $ 69.16 $ 60.96
Fair value, beginning balance, unvested | $ $ 343 $ 297
Fair value, vested | $ (136) (64)
Fair value, forfeited | $ (26) (26)
Fair value, ending balance, unvested | $ $ 331 $ 343
Restricted awards    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Granted (in shares) | shares 1,453 1,456
Granted, weighted average fair value at grant date (in dollars per share) | $ / shares $ 76.61 $ 72.05
Fair value, granted | $ $ 111 $ 105
Performance awards    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Granted (in shares) | shares 518 429
Granted, weighted average fair value at grant date (in dollars per share) | $ / shares $ 74.48 $ 72.71
Fair value, granted | $ $ 39 $ 31