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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2015
Effective tax rate (as a percent) | 39.00% | 78.00% | 41.00% | 35.00% |  |
Tax benefit from release of valuation allowance |  | $ 517 |  |  |  |
Period of cumulative income position |  |  |  |  | 3 years |
Tax expense which previously benefited from the decrease in the valuation allowance |  | $ 47 |  |  |  |
Deferred tax asset recognized, share based compensation | $ 17 |  | $ 17 |  |  |
Deferred tax asset not recognized, share based compensation | 53 |  | 53 |  |  |
Forecast |  |  |  |  |  |
Deferred tax asset recognized, share based compensation |  |  |  |  |  | $ 36
TopBuild |  |  |  |  |  |
Valuation allowance on deferred tax assets | $ 18 |  | $ 18 |  |  |

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