Discontinued Operations - Income Statement Line Items (Details) - Spinoff - TopBuild - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pre-tax profit (Loss) of discontinued operations
Net sales	$ 0	$ 404	$ 0	$ 762
Cost of sales	0	318	0	603
Gross profit	0	86	0	159
Selling, general and administrative expenses	0	80	0	148
Income from discontinued operations	0	6	0	11
Income tax expense	0	(10)	0	(12)
Loss from discontinued operations, net	$ 0	$ (4)	$ 0	$ (1)