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Related party transactions - Transactions with key management personnel (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Minimum      
Related party transactions      
Number of months base salary considered for severance payments 12 months    
Maximum      
Related party transactions      
Number of months base salary considered for severance payments 18 months    
Restricted Stock Units      
Related party transactions      
Number of other equity instruments granted in share-based payment arrangement (in shares) 5,762,233    
Senior Leadership Team      
Related party transactions      
Short-term benefits $ 5 $ 5 $ 7
Post-employment pension and other benefits 7 2 1
Share-based compensation $ 4 $ 11 $ 11
Senior Leadership Team | Restricted Stock Units      
Related party transactions      
Number of other equity instruments granted in share-based payment arrangement (in shares) | shares 1,259,640 458,854 301,190
Weighted average fair value at measurement date, other equity instruments granted $ 10 $ 9 $ 8
Senior Leadership Team | Phantom Performance Share Units      
Related party transactions      
Number of other equity instruments granted in share-based payment arrangement (in shares) | shares 839,016 322,984 229,627
Weighted average fair value at measurement date, other equity instruments granted $ 7 $ 7 $ 6