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Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings (Deficit) [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 | $ 1,966 |  | $ 1,952 | $ 58 | $ (45)
Beginning balance, shares at Dec. 31, 2014 |  | 107,067,000 |  |  |
Beginning balance, Common stock value at Dec. 31, 2014 |  | $ 1 |  |  |
Net loss | (502) |  |  | (502) |
Adjustment to income tax from spin-off | 3 |  | 3 |  |
Stock-based compensation | 27 |  | 27 |  |
Exercise of stock options, shares |  | 15,000 |  |  |
Vesting of restricted stock, shares |  | 200,000 |  |  |
Shares withheld for taxes | (2) |  | (2) |  |
Shares withheld for taxes, shares |  | (63,000) |  |  |
Other comprehensive income (loss) | (89) |  |  |  | (89)
Ending balance at Dec. 31, 2015 | 1,403 |  | 1,980 | (444) | (134)
Ending balance, shares at Dec. 31, 2015 |  | 107,219,000 |  |  |
Ending balance, Common stock value at Dec. 31, 2015 |  | $ 1 |  |  |
Net loss | (234) |  |  | (234) |
Stock-based compensation | 23 |  | 23 |  |
Exercise of stock options, shares |  | 20,000 |  |  |
Vesting of restricted stock, shares |  | 341,000 |  |  |
Shares withheld for taxes | (1) |  | (1) |  |
Shares withheld for taxes, shares |  | (105,000) |  |  |
Other comprehensive income (loss) | (8) |  |  |  | (8)
Ending balance at Dec. 31, 2016 | 1,183 |  | 2,002 | (678) | (142)
Ending balance, shares at Dec. 31, 2016 |  | 107,475,000 |  |  |
Ending balance, Common stock value at Dec. 31, 2016 | 1 | $ 1 |  |  |
Net loss | (52) |  |  | (52) |
Stock-based compensation | 20 |  | 20 |  |
Exercise of stock options | $ 1 |  | 1 |  |
Exercise of stock options, shares | 36,000 | 35,000 |  |  |
Vesting of restricted stock, shares |  | 771,000 |  |  |
Shares withheld for taxes | $ (4) |  | (4) |  |
Shares withheld for taxes, shares |  | (251,000) |  |  |
Other comprehensive income (loss) | 37 |  |  |  | 37
Ending balance at Dec. 31, 2017 | 1,185 |  | $ 2,019 | $ (730) | $ (105)
Ending balance, shares at Dec. 31, 2017 |  | 108,030,000 |  |  |
Ending balance, Common stock value at Dec. 31, 2017 | $ 1 | $ 1 |  |  |

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