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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid in Capital | Accumulated Loss | Accumulated Loss Cumulative Effect, Period of Adoption, Adjustment | Treasury Stock | Accumulated Other Comprehensive Loss | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ (2,027) | $ (11) | $ 1 | $ 808 | $ (2,461) | $ (11) | $ (175) | $ (200) | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net redemption of common stock in connection with stock options and RSUs | (16) |  |  | 16 |  |  |  |  |
Stock-based compensation | 43 |  |  | 43 |  |  |  |  |
Net loss | (352) |  |  |  | (352) |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest | 0 |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (352) |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (100) |  |  |  |  |  |  | (100) |
Ending balance at Dec. 31, 2018 | $ (2,463) |  | 1 | 835 | (2,824) |  | (175) | (300) | 0
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201905Member |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net redemption of common stock in connection with stock options and RSUs | $ 12 |  |  | 12 |  |  |  |  |
Gain (Loss) on Disposition of Stock in Subsidiary | 419 |  |  |  |  |  |  |  |
Proceeds from Issuance Initial Public Offering |  |  |  | 328 |  |  |  |  | 91
Stock-based compensation | 34 |  |  | 33 |  |  |  |  |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | 1 |  |  |  |  |  |  |  |
Net loss | (130) |  |  |  | (130) |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest | 12 |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (118) |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 8 |  |  |  |  |  |  | 8 |
Ending balance at Dec. 31, 2019 | (2,108) | $ (6) | 1 | 1,208 | (2,954) | $ (6) | (175) | (292) | 104
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net redemption of common stock in connection with stock options and RSUs | 4 |  |  | 4 |  |  |  |  |
Stock-based compensation | 60 |  |  | 56 |  |  |  |  | 4
Net loss | (569) |  |  |  | (569) |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest | 21 |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (548) |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 74 |  |  |  |  |  |  | 74 |
Ending balance at Dec. 31, 2020 | $ (2,524) |  | $ 1 | $ 1,268 | $ (3,529) |  | $ (175) | $ (218) | $ 129

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