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Equity - Statements of Redeemable Equity (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Increase (Decrease) in Temporary Equity            
Share-based Payments Subject to Redemption, Beginning Balance $ 21 $ 30 $ 23 $ 31 $ 30 $ 31
Share-based compensation, net of issuance 7 (9) 4 (8) (2) (4)
Share-based Payments Subject to Redemption, Ending Balance 28 21 $ 27 $ 23 28 $ 27
Redeemable Non-Controlling Interests, Beginning Balance 70 70     70  
Net income (loss) attributable to non-controlling interests   (1)     (1)  
Other comprehensive (loss) income   1     1  
Redeemable Non-Controlling Interests, Ending Balance $ 70 $ 70     $ 70