Stock-Based Compensation (Details) - 2006 Plan - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Share-based compensation expense | $ 3 | $ 4 | $ 5 |
| Non-qualified stock options | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Contractual term (years) | 5 years | ||
| Stock appreciation rights (SAR) | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Contractual term (years) | 7 years | ||