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Equity - Performance shares (Details)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
USD ($)
item
$ / shares
shares
Dec. 31, 2019
USD ($)
item
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
Share-based compensation          
Share-based payments subject to redemption   $ 30 $ 31 $ 37 $ 36
Performance Shares          
Share-based compensation          
Number of tranches | item   2 2    
Vesting terms       3 years  
Granted (in shares) | shares   81 70 27  
Weighted-average fair value per share, Granted (in dollars per share) | $ / shares   $ 94.48 $ 92.57 $ 141.91  
Cancelled (in shares) | shares   7      
Unrecognized compensation cost   $ 4      
Remaining requisite service period (in years)   1 year 9 months 18 days      
Share-based payments subject to redemption   $ 7 $ 9    
Performance shares, vesting based on shareholder return          
Share-based compensation          
Percentage of share-based compensation award   50.00% 50.00%    
Performance shares calculation period (in years)   3 years      
Vesting terms   3 years      
Performance shares, vesting based on shareholder return | Minimum          
Share-based compensation          
Performance shares available for vesting (as a percent)   0.00%      
Performance shares, vesting based on shareholder return | Maximum          
Share-based compensation          
Performance shares available for vesting (as a percent)   200.00%      
Performance shares, vesting based on ROIC          
Share-based compensation          
Percentage of share-based compensation award   50.00% 50.00%    
Performance shares calculation period (in years)   3 years      
Vesting terms   3 years 3 years    
Performance shares, vesting based on ROIC | Minimum          
Share-based compensation          
Performance shares available for vesting (as a percent)   0.00%      
Performance shares, vesting based on ROIC | Maximum          
Share-based compensation          
Performance shares available for vesting (as a percent)   200.00%      
Performance Shares Award Granted in 2018          
Share-based compensation          
Estimated pay out (as a percent)   0.00%      
Performance Shares Award Granted in 2017          
Share-based compensation          
Award pay out achieved (as a percent) 0.00%