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Condensed Consolidated Statement of Redeemable Equity
$ in Millions
USD ($)
Beginning Balance at Dec. 31, 2017 $ 36
Share-based Payments Subject to Redemption  
Share-based compensation, net of issuance (9)
Ending Balance at Mar. 31, 2018 27
Beginning Balance at Dec. 31, 2017 36
Share-based Payments Subject to Redemption  
Share-based compensation, net of issuance (5)
Ending Balance at Jun. 30, 2018 31
Beginning Balance at Mar. 31, 2018 27
Share-based Payments Subject to Redemption  
Share-based compensation, net of issuance 4
Ending Balance at Jun. 30, 2018 31
Beginning Balance at Dec. 31, 2018 37
Share-based Payments Subject to Redemption  
Share-based compensation, net of issuance (16)
Ending Balance at Mar. 31, 2019 21
Beginning Balance at Dec. 31, 2018 37
Share-based Payments Subject to Redemption  
Share-based compensation, net of issuance (12)
Ending Balance at Jun. 30, 2019 25
Beginning Balance at Mar. 31, 2019 21
Share-based Payments Subject to Redemption  
Share-based compensation, net of issuance 4
Ending Balance at Jun. 30, 2019 $ 25