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CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Retained Earnings
--- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2017 | 59.3 | 60.0 |  |  |
Beginning Balance at Dec. 31, 2017 | $ 1,337 | $ 0 | $ 1,044 | $ (5) | $ 298
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 107 |  |  |  | 107
Exchange of 1.625% Convertible Notes (in shares) |  | 2.0 |  |  |
Exchange of 1.625% Convertible Notes | 108 |  | 108 |  |
Other comprehensive gain (loss), net | (6) |  |  | (6) |
Share-based compensation | 1 |  | 1 |  |
Ending Balance (in shares) at Mar. 31, 2018 |  | 62.0 |  |  |
Ending Balance at Mar. 31, 2018 | $ 1,553 | $ 0 | 1,153 | (12) | 412
Beginning Balance (in shares) at Dec. 31, 2018 | 62.1 | 62.0 |  |  |
Beginning Balance at Dec. 31, 2018 | $ 1,647 | $ 0 | 643 | (8) | 1,012
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 198 |  |  |  | 198
Partial termination of 1.125% Warrants | (103) |  | (103) |  |
Exchange of 1.625% Convertible Notes | 0 |  |  |  |
Other comprehensive gain (loss), net | 5 |  |  | 5 |
Share-based compensation (in shares) |  | 1.0 |  |  |
Share-based compensation | 3 |  | 3 |  |
Ending Balance (in shares) at Mar. 31, 2019 |  | 63.0 |  |  |
Ending Balance at Mar. 31, 2019 | $ 1,835 | $ 0 | $ 543 | $ (3) | $ 1,295

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