Pension Plans, Postretirement and Other Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2018

Amounts Recognized in Balance Sheets for Pension Plans and Postretirement Benefit Plan

The measurement date for all defined benefit plans is December 31. The following provides a reconciliation of the plans’ benefit obligations, plan assets, and funded status as of December 31, 2018 and 2017:

	Pension Plans												Other Postretirement Benefits Plans
	U.S.						Non-U.S.
	2018			2017			2018			2017			2018			2017
	(Millions)
Change in benefit obligation:
Benefit obligation, beginning of year	$	263		$	272		$	471		$	438		$	151		$	143
Federal-Mogul acquisition	1,064			—			545			—			263			—
Service cost	1			1			13			9			—			—
Interest cost	21			10			15			13			8			5
Settlement	(1		)	(7		)	(13		)	(3		)	—			—
Curtailment	—			—			—			—			(1		)	—
Administrative expenses/taxes paid	—			—			(3		)	(2		)	—			—
Plan amendments	—			—			2			—			(66		)	—
Actuarial (gain)/loss	(12		)	10			(16		)	(9		)	(24		)	12
Benefits paid	(34		)	(23		)	(22		)	(18		)	(15		)	(10		)
Medicare subsidies received	—			—			—			—			1			—
Participants’ contributions	—			—			1			1			1			—
Held for sale	—			—			(16		)	—			—			—
Currency rate conversion and other	—			—			(31		)	42			4			1
Benefit obligation, end of year	1,302			263			946			471			322			151
Change in plan assets:
Fair value of plan assets, beginning of year	202			192			438			369			—			—
Federal-Mogul acquisition	943			—			81			—			—			—
Settlement	(1		)	(7		)	(14		)	(3		)	—			—
Actual return on plan assets	(122		)	22			(1		)	42			—			—
Administrative expenses/taxes paid	—			—			—			(2		)	—			—
Employer contributions	6			18			21			14			13			10
Medicare subsidies received	—			—			—			—			1			—
Participants’ contributions	—			—			1			1			1			—
Benefits paid	(33		)	(23		)	(25		)	(18		)	(15		)	(10		)
Held for sale	—			—			(10		)	—			—			—
Currency rate conversion and other	—			—			(25		)	35			—			—
Fair value of plan assets, end of year	995			202			466			438			—			—
Funded status of the plans	$	(307	)	$	(61	)	$	(480	)	$	(33	)	$	(322	)	$	(151	)

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

Amounts recognized on the consolidated balance sheets consist of the following as of December 31, 2018 and 2017:

	Pension Plans												Other Postretirement Benefits Plans
	U.S.						Non-U.S.
	2018			2017			2018			2017			2018			2017
	(Millions)
Noncurrent assets	$	—		$	—		$	33		$	28		$	—		$	—
Current liabilities	(5		)	(2		)	(17		)	(3		)	(28		)	(9		)
Noncurrent liabilities (a)	(302		)	(59		)	(496		)	(58		)	(294		)	(142		)
	$	(307	)	$	(61	)	$	(480	)	$	(33	)	$	(322	)	$	(151	)

^(a)The "pension and postretirement benefits" line in the consolidated balance sheets includes $75 million and $9 million as of December 31, 2018 and 2017 of postemployment benefits which are not included in the table above.

Amounts Recognized in Accumulated Other Comprehensive Loss for Pension Benefits

Amounts recognized in accumulated other comprehensive loss for pension and postretirement benefits, inclusive of tax effects, consist of the following components as of December 31, 2018 and 2017:

	Pension Plans								Other Postretirement Benefits Plans
	U.S.				Non-U.S.
	2018		2017		2018		2017		2018			2017
	(Millions)
Actuarial loss	$	255	$	130	$	80	$	91	$	31		$	51
Prior service cost/(credit)	—		—		4		3		(73		)	—
Total	$	255	$	130	$	84	$	94	$	(42	)	$	51

Projected Benefit Obligation Accumulated Benefit Obligation and Fair Value of Plan Assets for all Pension Plans

Information for defined benefit plans with projected benefit obligations in excess of plan assets:

	Pension Plans								Other Postretirement Benefits Plans
	2018				2017
	U.S.		Non-U.S.		U.S.		Non-U.S.		2018		2017
	(Millions)
Projected benefit obligation	$	1,302	$	652	$	263	$	130	$	322	$	151
Fair value of plan assets	$	995	$	138	$	202	$	69	$	—	$	—

Information for pension plans with accumulated benefit obligations in excess of plan assets:

	December 31, 2018				December 31, 2017
	U.S.		Non-U.S.		U.S.		Non-U.S.
	(Millions)
Projected benefit obligation	$	1,302	$	620	$	263	$	117
Accumulated benefit obligation	$	1,302	$	606	$	263	$	112
Fair value of plan assets	$	995	$	111	$	202	$	56

Components of Net Periodic Benefit Cost

Net periodic pension and postretirement benefits costs for the years 2018, 2017 and 2016, consist of the following components:

	Pension Plans																		Other Postretirement Benefits Plans
	U.S.									Non-U.S.
	2018			2017			2016			2018			2017			2016			2018		2017			2016
	(Millions)
Service cost	$	1		$	1		$	1		$	14		$	9		$	8		$	—	$	—		$	—
Interest cost	21			10			15			15			13			14			8		5			6
Expected return on plan assets	(28		)	(14		)	(23		)	(18		)	(25		)	(20		)	—		—			—
Curtailment loss	—			—			—			—			—			—			1		—			—
Settlement loss	1			8			72			3			1			—			—		—			—
Net amortization:
Actuarial loss	5			5			8			6			9			7			5		4			5
Prior service cost (credit)	—			—			—			1			1			1			—		(1		)	(1		)
Net periodic costs	$	—		$	10		$	73		$	21		$	8		$	10		$	14	$	8		$	10

Assumptions Used in Accounting for Pension Plans

The following assumptions were used in the accounting for the pension and other postretirement benefits plans for the years of 2018, 2017, and 2016:

	Pension Plans												Other Postretirement Benefits Plans
	U.S.						Non-U.S.
	2018		2017		2016		2018		2017		2016		2018		2017		2016
Weighted-average assumptions used to determine benefit obligations:
Discount rate	4.2	%	3.8	%	4.2	%	2.6	%	2.6	%	2.8	%	4.3	%	3.8	%	4.2	%
Rate of compensation increase	n/a		n/a		n/a		—	%	2.5	%	2.5	%	n/a		n/a		n/a
Weighted-average assumptions used to determine net periodic benefit cost:
Discount rate	4.1	%	4.2	%	4.3	%	2.4	%	2.8	%	3.5	%	4.2	%	4.2	%	4.3	%
Expected long-term return on plan assets	6.0	%	7.8	%	7.6	%	4.2	%	5.2	%	5.7	%	n/a		n/a		n/a
Rate of compensation increase	n/a		n/a		n/a		2.9	%	2.5	%	2.7	%	n/a		n/a		n/a

Components of Net Periodic Benefit Cost

Estimated amounts to be amortized from accumulated other comprehensive loss into net periodic benefit cost in the year ending December 31, 2019 based on December 31, 2018 plan measurements:

	2019
	Pension Plans				Other Postretirement Benefits Plans
	U.S.		Non-U.S
	(Millions)
Net actuarial loss	$	5	$	5	$	4
Prior service cost	—		1		(8		)
	$	5	$	6	$	(4	)

Estimated Pension Plan Benefit Payments

Estimated future benefit payments are as follows:

	Pension Plans				Other Postretirement Benefits Plans
Year	U.S.		Non-U.S.
	(Millions)
2019	$	100	$	43	$	28
2020	$	99	$	44	$	28
2021	$	99	$	43	$	27
2022	$	101	$	45	$	26
2023	$	100	$	49	$	26
2024-2028	$	442	$	243	$	113

Pension Plan Assets Invested

Pension plan assets were invested in the following classes of securities:

	Percentage of Fair Market Value
	December 31, 2018
	U.S.		Non-U.S.
Equity securities	62	%	32	%
Fixed income securities	17	%	5	%
Debt securities	11	%	43	%
Insurance contracts	—	%	15	%
Other	10	%	5	%

Plan Assets using Fair Value Hierarchy

The following table presents the Company’s defined benefit plan assets measured at fair value by asset class:

	Fair Value Level as of December 31, 2018
	U.S.								Non-U.S.
Asset Category	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	(Millions)
Investments with registered investment companies:
Equity securities	$	323	$	—	$	—	$	323	$	1	$	—	$	—	$	1
Fixed income securities	167		—		—		167		21		—		—		21
Real estate and other	41		—		—		41		—		—		—		—
Equity securities	194		—		—		194		14		55		—		69
Debt securities:
Corporate and other	—		18		—		18		8		—		—		8
Government	12		21		—		33		2		147		—		149
Real Estate and other	—		—		—		—		1		4		—		5
Insurance contracts	—		—		—		—		—		—		71		71
Hedge funds	—		—		28		28		—		—		—		—
Cash and equivalents	33		—		—		33		17		—		—		17
Total	$	770	$	39	$	28	$	837	$	64	$	206	$	71	$	341
Plan assets measured at net asset value
Equity securities							$	104							$	81
Government debt securities							—								30
Corporate and other debt securities							54								14
Total plan assets measured at net asset value							158								125
Net plan assets							$	995							$	466

	Fair Value Level as of December 31, 2017
	U.S.								Non-U.S.
Asset Category	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	(Millions)
Equity securities	$	21	$	—	$	—	$	21	$	16	$	101	$	—	$	117
Debt securities:
Corporate and other	—		—		—		—		6		16		—		22
Government	—		—		—		—		2		112		—		114
Real Estate and other	—		—		—		—		1		6		—		7
Insurance contracts	—		—		—		—		—		16		9		25
Cash and equivalents	2		—		—		2		9		1		—		10
Total	$	23	$	—	$	—	$	23	$	34	$	252	$	9	$	295
Plan assets measured at net asset value
Equity securities							$	120							$	97
Government debt securities							—								32
Corporate and other debt securities							59								14
Total plan assets measured at net asset value							179								143
Net plan assets							$	202							$	438

Changes in Fair Value of Level 3 Assets

The table below summarizes the changes in the fair value of the Level 3 assets:

	December 31, 2018						December 31, 2017
	Level 3 Assets						Level 3 Assets
	U.S.			Non-U.S.			U.S.		Non-U.S.
	(Millions)						(Millions)
Balance at December 31 of the previous year	$	—		$	9		$	—	$	9
Federal-Mogul acquisition	30			56			—		—
Net realized/unrealized gains (loss)	(2		)	1			—		—
Purchases and settlements, net	—			—			—		—
Sales, net	—			—			—		—
Transfers into (out) of Level 3	—			15			—		—
Held for sale	—			(10		)
Foreign currency exchange rate movements	—			—			—		—
Ending Balance at December 31	$	28		$	71		$	—	$	9

Significant Concentrations of Risk

The following table contains information about significant concentrations of risk, including all individual assets that make up more than 5% of the total assets and any direct investments in Tenneco stock:

Asset Category	Fair Value Level	Value		Percentage of Total Assets
	(Millions)
2018:
Tenneco stock	1	$	10	0.7	%
2017:
Tenneco stock	1	$	21	3.3	%

Schedule of Health Care Cost Trend Rates [Table Text Block]

The weighted-average assumed health care cost trend rate used in determining next year's postretirement health care benefits are as follows:

	Other Postretirement Benefits Plans
	2018		2017		2016
Initial health care cost trend rate	6.9	%	6.8	%	7.0	%
Ultimate health care cost trend rate	4.9	%	4.5	%	4.5	%
Year ultimate health care cost trend rate reached	2027		2027		2026

The following table illustrates the sensitivity to a change in the assumed health care cost trend rate:

	Total Service and Interest Cost			Postretirement Benefits Obligation
	(Millions)
100 basis point ("bp") increase in health care cost trend rate	$	1		$	23
100 bp decrease in health care cost trend rate	$	(1	)	$	(20	)