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Equity - Restricted stock units (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Other disclosures            
Share-based payments subject to redemption $ 27 $ 23 $ 31 $ 25 $ 21 $ 37
Restricted stock units (RSUs)            
Share-based compensation            
Vesting terms 3 years          
Service period over which compensation expense would be amortized 1 year          
Restricted stock unit activity            
Non-vested at the beginning of the period (in shares) 339          
Granted (in shares) 171          
Vested (in shares) (92)          
Cancelled (in shares) (12)          
Non-vested at the end of the period (in shares) 406          
Weighted-average fair value per share            
Non-vested at the beginning of the period (in dollars per share) $ 108.02          
Granted (in dollars per share) 88.29          
Vested (in dollars per share) 117.25          
Cancelled (in dollars per share) 104.34          
Non-vested at the end of the period (in dollars per share) $ 97.75          
Other disclosures            
Unrecognized compensation cost $ 21          
Weighted-average period for amortization of unrecognized compensation cost 2 years