Segment Information

3 Months Ended

Mar. 31, 2018

In connection with the reportable segment changes announced on April 27, 2018, effective for the first quarter of 2018, the Company’s reportable segments for financial reporting purposes 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 new reporting segments. These changes also resulted in changes to the Company's reporting units. The Company allocated goodwill to its new reporting units using a relative fair value approach. In addition, the Company completed an assessment of any 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

At March 31, 2018 and for the Three Months Ended March 31, 2018
Revenues from external customers	$	1,756	$	513	$	305	$	2,574	$	—		$	—		$	2,574
Intersegment revenues	15		15		10		40		—			(40		)	—
EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	119		8		35		162		(45		)	—			117
Total assets	3,095		1,152		861		5,108		—			58			5,166
At March 31, 2017 and for the Three Months Ended March 31, 2017
Revenues from external customers	1,555		428		309		2,292		—			—			2,292
Intersegment revenues	25		15		11		51		—			(51		)	—
EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	94		27		42		163		(42		)	—			121
Total assets	2,809		1,013		785		4,607		—			35			4,642