Earnings Per Share (EPS) - Computation of Basic and Diluted EPS Attributable to Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Basic EPS | ||
| Net income | $ 54 | $ 29 |
| Weighted average shares of common stock outstanding (in shares) | 70,047,752 | 68,509,328 |
| Basic EPS (in dollars per share) | $ 0.77 | $ 0.42 |
| Diluted EPS | ||
| Net income | $ 54 | $ 29 |
| Weighted average shares of common stock outstanding (in shares) | 70,047,752 | 68,509,328 |
| Dilutive effect of stock options and restricted stock units (in shares) | 2,000,000 | 2,000,000 |
| Weighted average shares of common stock outstanding (in shares) | 72,274,821 | 70,913,970 |
| Diluted EPS (in dollars per share) | $ 0.75 | $ 0.41 |
| Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect (in shares) | 1,000,000 | 1,000,000 |