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Equity-based compensation - Additional information (Details)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
shares
metric
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Apr. 08, 2019
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Equity-based compensation expense $ 113 $ 114 $ 93  
Accrued share-based payments $ 9 $ 10    
Number of awards outstanding (in shares) | shares 5,417 4,742   4,222
Remaining weighted-average vesting period 1 year 3 months 18 days      
Chief executive officer [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Percent paid in cash   50.00%    
Percent paid in equity shares   50.00%    
Top leaders [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Percent paid in cash   70.00%    
Percent paid in equity shares   30.00%    
Long-term Incentive Plan [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 3 years      
Number of metrics | metric 4      
Restricted awards [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period   3 years    
Minimum [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share savings plan holding period 3 years      
Minimum [member] | Long-term Incentive Plan [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Target incentive percent of base salary 30.00%      
Payout percent 0.00%      
Maximum [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share savings plan holding period 5 years      
Maximum [member] | Long-term Incentive Plan [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Target incentive percent of base salary 430.00%      
Payout percent 200.00%