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v3.20.4

Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions | Total | Adoption of new accounting standards | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Adoption of new accounting standards | Retained Earnings | Retained Earnings Adoption of new accounting standards
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2017 | 59,300,000 |  | 60,000,000 |  |  |  |  |
Beginning Balance at Dec. 31, 2017 | $ 1,337 | $ 6 | $ 0 | $ 1,044 | $ (5) | $ (1) | $ 298 | $ 7
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 707 |  |  |  |  |  | 707 |
Termination of warrants | (550) |  |  | (550) |  |  |  |
Exchange of convertible senior notes (in shares) |  |  | 2,000,000 |  |  |  |  |
Exchange of convertible senior notes | 108 |  |  | 108 |  |  |  |
Conversion of convertible senior notes | 4 |  |  | 4 |  |  |  |
Other comprehensive income (loss), net | (2) |  |  |  | (2) |  |  |
Share-based compensation | $ 37 |  |  | 37 |  |  |  |
Ending Balance (in shares) at Dec. 31, 2018 | 62,100,000 |  | 62,000,000 |  |  |  |  |
Ending Balance at Dec. 31, 2018 | $ 1,647 | $ 85 | $ 0 | 643 | (8) |  | 1,012 | $ 85
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 737 |  |  |  |  |  | 737 |
Common stock purchases | (54) |  |  | (1) |  |  | (53) |
Termination of warrants | (514) |  |  | (514) |  |  |  |
Exchange of convertible senior notes | 0 |  |  |  |  |  |  |
Other comprehensive income (loss), net | 12 |  |  |  | 12 |  |  |
Share-based compensation | $ 47 |  |  | 47 |  |  |  |
Ending Balance (in shares) at Dec. 31, 2019 | 61,900,000 |  | 62,000,000 |  |  |  |  |
Ending Balance at Dec. 31, 2019 | $ 1,960 |  | $ 0 | 175 | 4 |  | 1,781 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 673 |  |  |  |  |  |  |
Common stock purchases (in shares) |  |  | (4,000,000) |  |  |  |  |
Common stock purchases | (605) |  |  | (11) |  |  | (594) |
Termination of warrants | (30) |  |  | (30) |  |  |  |
Exchange of convertible senior notes | 0 |  |  |  |  |  |  |
Other comprehensive income (loss), net | 33 |  |  |  | 33 |  |  |
Share-based compensation (in shares) |  |  | 1,000,000 |  |  |  |  |
Share-based compensation | 65 |  |  | 65 |  |  |  |
Ending Balance (in shares) at Dec. 31, 2020 |  |  | 59,000,000 |  |  |  |  |
Ending Balance at Dec. 31, 2020 | $ 2,096 |  | $ 0 | $ 199 | $ 37 |  | $ 1,860 |

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