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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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Represents the deferred tax asset not recognized relating to share based compensation.

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Represents the deferred tax asset recognized relating to share based compensation.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations from release of valuation allowance.

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The period of cumulative income loss position that is significant positive or negative evidence in considering whether deferred tax assets are realizable.

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Amount of current income tax expense and deferred income tax expense pertaining to continuing operations from release of valuation allowance.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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