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Stockholders' Equity - Additional Disclosure for Stock Options (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Additional Disclosures for equity-based plans |  |  |
Proceeds from issuance of common stock on exercised options |  | $ 0 | $ 0
Stock Options |  |  |
Additional Disclosures for equity-based plans |  |  |
Total fair value of options vested | $ 4 | 7 | 7
Total intrinsic value of options exercised | 24 | 36 | 21
Proceeds from issuance of common stock on exercised options | $ 7 | $ 11 | $ 5

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