SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Reconciliation of Revenue from Segments to Consolidated

The following table summarizes our Net sales by segment and geographic region (in millions). Corporate eliminations (shown below) largely reflect intercompany sales from Composites to Roofing. External customer sales are attributed to geographic region based upon the location from which the product is shipped to the external customer.

	Three Months Ended   March 31,
	2018			2017
Reportable Segments
Composites	$	511		$	511
Insulation	596			399
Roofing	642			627
Total reportable segments	1,749			1,537
Corporate eliminations	(58		)	(59		)
NET SALES	$	1,691		$	1,478

Schedule of Revenues by Geographical Areas

External Customer Sales by Geographic Region
United States	$	1,128	$	1,051
Europe	279		140
Asia-Pacific	142		153
Rest of World	142		134
NET SALES	$	1,691	$	1,478

Schedule of Earnings before Interest and Taxes

The following table summarizes EBIT by segment (in millions):

	Three Months Ended   March 31,
	2018			2017
Reportable Segments
Composites	$	60		$	71
Insulation	32			5
Roofing	97			125
Total reportable segments	189			201
Restructuring costs	(5		)	—
Acquisition-related costs	(14		)	(1		)
Recognition of acquisition inventory fair value step-up	(2		)	—
General corporate expense and other	(37		)	(30		)
Total Corporate, other and eliminations	(58		)	(31		)
EBIT	$	131		$	170