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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Effective tax rate (as a percent) | 46.00% | 20.00% | 43.00% | 14.00%
State |  |  |  |
Income tax benefit on uncertain tax positions, expiration of statutes of limitations and settlements on audits |  | $ 19 |  | $ 19
TopBuild |  |  |  |
Valuation allowance on deferred tax assets | $ 18 |  | $ 18 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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