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Equity - Statements of Redeemable Equity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Payments Subject to Redemption    
Beginning Balance $ 37 $ 36
Share-based compensation, net of issuance (16) (9)
Ending Balance $ 21 $ 27