17. Segment Information

The Company expects to separate its businesses to form two new, independent publicly traded companies and now expects the DRiV spinoff to occur mid-2020.As such, the Company began to manage and report its DRiV businesses through two new operating segments, in the first quarter of 2019, as compared to the three operating segments it had previously reported. The DRiV operating segments consist of Motorparts and Ride Performance. The new Motorparts operating segment consists of the previously reported Aftermarket operating segment as well as the aftermarket portion of the previously reported Motorparts operating segment. The Ride Performance operating segment consists of the previously reported Ride Performance operating segment as well as the OE Braking business that was included in the previously reported Motorparts operating segment. As such, prior period operating segment results have been conformed to reflect the Company's current operating segments. The future New Tenneco consists of two existing operating segments, Powertrain and Clean Air. Costs related to other business activities, primarily corporate headquarter functions, are disclosed separately from the four operating segments as "Corporate."

Management uses EBITDA including noncontrolling interests as the key performance measure of segment profitability and uses the measure in its financial and operational decision making processes, for internal reporting, and for planning and forecasting purposes to effectively allocate resources. EBITDA including noncontrolling interests is defined as earnings before interest expense, income taxes, noncontrolling interests, and depreciation and amortization. Segment assets are not presented as it is not a measure reviewed by the Chief Operating Decision Maker in allocating resources and assessing performance.

EBITDA including noncontrolling interests should not be considered a substitute for results prepared in accordance with US GAAP and should not be considered an alternative to net income, which is the most directly comparable financial measure to EBITDA including noncontrolling interests that is in accordance with US GAAP. EBITDA including noncontrolling interests, as determined and measured by the Company, should not be compared to similarly titled measures reported by other companies.

The following table summarizes certain of the Company's segment information:



	Reportable Segments
	Clean Air		Powertrain		Ride Performance			Motorparts		Total		Corporate			Reclass & Elims			Total
For the Three Months Ended March 31, 2019
Revenues from external customers	$	1,779	$	1,175	$	733		$	797	$	4,484	$	—		$	—		$	4,484
Intersegment revenues	$	—	$	46	$	46		$	11	$	103	$	—		$	(103	)	$	—
EBITDA, including noncontrolling interests	$	131	$	113	$	(45	)	$	45	$	244	$	(99	)	$	—		$	145
For the Three Months Ended March 31, 2018
Revenues from external customers	$	1,756	$	—	$	513		$	312	$	2,581	$	—		$	—		$	2,581
Intersegment revenues	$	—	$	—	$	6		$	—	$	6	$	—		$	(6	)	$	—
EBITDA, including noncontrolling interests	$	157	$	—	$	24		$	45	$	226	$	(44	)	$	—		$	182

Segment EBITDA including noncontrolling interests and the reconciliation to earnings before interest expense, income taxes, and noncontrolling interests are as follow:



	Three Months Ended March 31,
	2019			2018
EBITDA including noncontrolling interests by Segments:
Clean Air	$	131		$	157
Powertrain	113			—
Ride Performance	(45		)	24
Motorparts	45			45
Corporate	(99		)	(44		)
Total EBITDA including noncontrolling interests	145			182
Less: Depreciation and amortization	(169		)	(60		)
Earnings (loss) before interest expense, income taxes, and noncontrolling interests	(24		)	122
Less: Interest expense	(81		)	(23		)
Less: Income tax expense (benefit)	—			(25		)
Net income (loss)	$	(105	)	$	74

Revenue from contracts with customers is disaggregated by customer type and geography, as it depicts the nature and amount of the Company’s revenue that is aligned with the Company's key growth strategies. In the following tables, revenue is disaggregated accordingly:



	Reportable Segments
By Customer Type	Clean Air		Powertrain		Ride Performance		Motorparts		Total
Three Months Ended March 31, 2019
OE - Substrate	$	706	$	—	$	—	$	—	$	706
OE - Value add	1,073		1,175		733		—		2,981
Aftermarket	—		—		—		797		797
Total	$	1,779	$	1,175	$	733	$	797	$	4,484
Three Months Ended March 31, 2018
OE - Substrate	$	652	$	—	$	—	$	—	$	652
OE - Value add	1,104		—		513		—		1,617
Aftermarket	—		—		—		312		312
Total	$	1,756	$	—	$	513	$	312	$	2,581



	Reportable Segments
By Geography	Clean Air		Powertrain		Ride Performance		Motorparts		Total
Three Months Ended March 31, 2019
North America	$	793	$	405	$	232	$	507	$	1,937
Europe, Middle East and Africa	641		575		378		237		1,831
Rest of world	345		195		123		53		716
Total	$	1,779	$	1,175	$	733	$	797	$	4,484
Three Months Ended March 31, 2018
North America	$	768	$	—	$	180	$	188	$	1,136
Europe, Middle East and Africa	657		—		225		108		990
Rest of world	331		—		108		16		455
Total	$	1,756	$	—	$	513	$	312	$	2,581