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Equity - Performance shares (Details)
$ / shares in Units, shares in Thousands, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
item
$ / shares
shares
Dec. 31, 2021
USD ($)
item
Mar. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Share-based compensation            
Share-based payments subject to redemption | $ $ 37 $ 36 $ 31 $ 28 $ 21 $ 30
Performance Shares            
Share-based compensation            
Number of tranches | item 2 2        
Granted (in shares) | shares 86          
Weighted-average fair value per share, Granted (in dollars per share) | $ / shares $ 138.85          
Cancelled (in shares) | shares 1          
Unrecognized compensation cost | $ $ 14          
Remaining requisite service period (in years) 2 years 1 month 6 days          
Performance shares, vesting based on TSR            
Share-based compensation            
Percentage of share-based compensation award 50.00% 50.00%        
Performance shares, vesting based on Adjusted ROIC            
Share-based compensation            
Percentage of share-based compensation award 50.00% 50.00%        
Performance period (in years) 3 years 3 years        
2019 Awards | Performance Shares            
Share-based compensation            
Performance period (in years) 3 years          
Award pay out achieved (as a percent) 0.00%          
2022 Awards | Performance shares, vesting based on TSR            
Share-based compensation            
Vesting period 3 years          
Performance period (in years) 3 years          
2022 Awards | Performance shares, vesting based on TSR | Minimum            
Share-based compensation            
Performance shares available for vesting (as a percent) 0.00%          
2022 Awards | Performance shares, vesting based on TSR | Maximum            
Share-based compensation            
Performance shares available for vesting (as a percent) 200.00%          
2022 Awards | Performance shares, vesting based on Adjusted ROIC            
Share-based compensation            
Vesting period 3 years          
Performance period (in years) 3 years          
2022 Awards | Performance shares, vesting based on Adjusted ROIC | Minimum            
Share-based compensation            
Performance shares available for vesting (as a percent) 0.00%          
2022 Awards | Performance shares, vesting based on Adjusted ROIC | Maximum            
Share-based compensation            
Performance shares available for vesting (as a percent) 200.00%