Segments

During the fourth quarter of 2017, as part of the realignment of our operating structure, we changed the composition of our reportable segments, effective for the quarter ended December 31, 2017. See Note 1, Organization, Consolidation and Presentation of Financial Statements, for additional information regarding our five reportable segments. See Note 3 for segment results for UBBP. Segment results for our U.S. Wallboard and Surfaces, U.S. Performance Materials, U.S. Ceilings and Canada segments were as follows:



	Three months ended March 31,
(millions)	2018			2017
Net Sales:
U.S. Wallboard and Surfaces	$	441		$	469
U.S. Performance Materials	92			86
U.S. Ceilings	138			112
Canada	111			96
Other	60			56
Eliminations	(56		)	(52		)
Total	$	786		$	767

Operating Profit (Loss):
U.S. Wallboard and Surfaces	$	49		$	79
U.S. Performance Materials	1			6
U.S. Ceilings	19			20
Canada	2			2
Other	4			1
Corporate	(29		)	(24		)
Total	$	46		$	84

Net sales disaggregated by product type were as follows:



	Three months ended March 31, 2018
(millions)	U.S. Wallboard and Surfaces			U.S. Performance Materials			U.S. Ceilings			Canada			Other		Total
Wallboard	$	220		$	—		$	—		$	63		$	18	$	301
Surfaces and industrial products	145			—			—			23			7		175
Underlayment	—			65			—			2			9		76
Building envelope and structural	—			18			—			—			—		18
Ceiling tile and grid	—			—			116			12			9		137
Specialty ceilings	—			—			16			2			—		18
Other products	24			—			—			3			16		43
Total product sales	389			83			132			105			59		768
Other miscellaneous sales ^(a)	52			9			6			6			1		74
Total sales before eliminations	441			92			138			111			60		842
Eliminations	(31		)	(6		)	(12		)	(7		)	—		(56		)
Total net sales	$	410		$	86		$	126		$	104		$	60	$	786


(a)	Other miscellaneous sales primarily includes shipping and handling costs billed to customers.