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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Effective tax rate (as a percent) | 36.00% | 46.00% | 34.00% | 43.00%
Uncertain tax position expirations |  |  | $ 4 |
TopBuild |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Deferred tax assets, valuation allowance |  | $ 18 |  | $ 18

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