Discontinued Operations - Income Statement Line Items (Details) - Spinoff - TopBuild - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Pre-tax profit (Loss) of discontinued operations
Net sales	$ 0	$ 358
Cost of sales	0	285
Gross profit	0	73
Selling, general and administrative expenses	0	68
Income from discontinued operations	0	5
Income tax expense	0	(2)
Income from discontinued operations, net	$ 0	$ 3

Amount of selling, general and administrative expense attributable to disposal group.

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Amount of income (loss) before tax attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of gross profit attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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