Segment Information

In the first quarter of 2018, the Company revised its reportable segments to consist of the following three segments: Clean Air, Ride Performance and Aftermarket. The new reportable segments, which are also the Company's operating segments, align with how the Chief Operating Decision Maker allocates resources and assesses performance against the Company’s key growth strategies. Costs related to other business activities, primarily corporate headquarter functions, are disclosed separately from the three operating segments as "Other." We evaluate segment performance based primarily on earnings before interest expense, income taxes, and noncontrolling interests. Products are transferred between segments and geographic areas on a basis intended to reflect as nearly as possible the “market value” of the products. Prior period segment information has been retrospectively revised to reflect our current segmentation. These changes also resulted in changes to the Company's reporting units. The Company allocated goodwill to its new reporting units in the first quarter of 2018, using a relative fair value approach, assessed potential goodwill impairment for all reporting units immediately before and immediately after the reallocation, and determined that no impairment existed.

The following table summarizes certain Tenneco Inc. segment information:



	Segments
	Clean Air		Ride Performance		Aftermarket		Total		Other			Reclass & Elims			Total
	(Millions)
At June 30, 2018 and for the Three Months Ended June 30, 2018
Revenues from external customers	$	1,694	$	506	$	337	$	2,537	$	—		$	—		$	2,537
Intersegment revenues	13		14		13		40		—			(40		)	—
EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	105		5		50		160		(47		)	—			113
Total assets	2,957		1,094		896		4,947		—			56			5,003
At June 30, 2017 and for the Three Months Ended June 30, 2017
Revenues from external customers	$	1,539	$	442	$	336	$	2,317	$	—		$	—		$	2,317
Intersegment revenues	17		13		10		40		—			(40		)	—
EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	106		18		54		178		(151		)	—			27
Total assets	2,907		1,075		872		4,854		—			27			4,881
At June 30, 2018 and for the Six Months Ended June 30, 2018
Revenues from external customers	$	3,450	$	1,019	$	642	$	5,111	$	—		$	—		$	5,111
Intersegment revenues	28		29		23		80		—			(80		)	—
EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	224		13		85		322		(92		)	—			230
Total assets	2,957		1,094		896		4,947		—			56			5,003
At June 30, 2017 and for the Six Months Ended June 30, 2017
Revenues from external customers	$	3,094	$	870	$	645	$	4,609	$	—		$	—		$	4,609
Intersegment revenues	42		28		21		91		—			(91		)	—
EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	200		45		96		341		(193		)	—			148
Total assets	2,907		1,075		872		4,854		—			27			4,881