Tenneco (TEN) 10-K 25 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2014	Feb. 20, 2015	Jun. 30, 2014
Document Documentand Entity Information [Abstract]
Entity Registrant Name	TENNECO INC
Entity Central Index Key	1024725
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Trading Symbol	TEN
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		61,288,883
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$3.90

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended								12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Net sales and operating revenues	$2,004	$2,081	$2,241	$2,094	$2,031	$1,963	$2,067	$1,903	$8,420	$7,964	$7,363
Costs and expenses
Cost of sales (exclusive of depreciation and amortization shown below)	1,685	1,735	1,851	1,754	1,703	1,691	1,736	1,604	7,025	6,734	6,170
Goodwill impairment charge									0	0	0
Engineering, research, and development									169	144	126
Selling, general, and administrative									519	453	427
Depreciation and amortization of other intangibles									208	205	205
Costs and expenses									7,921	7,536	6,928
Other income (expense)
Loss on sale of receivables									-4	-4	-4
Other expense									-3	0	-3
Total other income (expense)									-7	-4	-7
Earnings before interest expense, income taxes, and noncontrolling interests	83	140	156	113	118	72	141	93	492	424	428
Interest expense (net of interest capitalized of $5 million for 2014 and $4 million for 2013 and 2012, respectively)									91	80	105
Earnings before income taxes and noncontrolling interests									401	344	323
Income tax expense									131	122	19
Net income									270	222	304
Less: Net income attributable to noncontrolling interests									44	39	29
Net income attributable to Tenneco Inc.	$21	$78	$81	$46	$54	$12	$63	$54	$226	$183	$275
Weighted average shares of common stock outstanding —
Basic (in shares)									60,734,022	60,474,492	59,985,677
Diluted (in shares)									61,782,508	61,594,062	61,083,510
Basic earnings per share of common stock (in dollars per share)	$0.34	$1.29	$1.34	$0.76	$0.90	$0.19	$1.04	$0.90	$3.72	$3.03	$4.58
Diluted earnings per share of common stock (in dollars per share)	$0.33	$1.27	$1.32	$0.75	$0.88	$0.19	$1.02	$0.88	$3.66	$2.97	$4.50

CONSOLIDATED_STATEMENTS_OF_INC1

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Capitalized interest	$5	$4	$4

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cumulative Translation Adjustment
Balance January 1	($56)	($19)	($26)
Translation of foreign currency statements	-107	-37	7
Balance December 31	-163	-56	-19
Additional Liability for Pension and Postretirement Benefits [Roll Forward]
Balance January 1	-299	-384	-352
Adjustment to the Liability for Pension and Postretirement benefits, net of tax	-80	85	-32
Balance December 31	-379	-299	-384
Balance December 31	-542	-355	-403
Net income	270	222	304
Translation of foreign currency statements	-107	-37	7
Adjustment to the Liability for Pension and Postretirement benefits, net of tax	-80	85	-32
Other comprehensive income	-187	48	-25
Comprehensive Income	83	270	279
Tenneco Inc.
Cumulative Translation Adjustment
Balance January 1	-61	-24	-30
Translation of foreign currency statements	-105	-37	6
Balance December 31	-166	-61	-24
Additional Liability for Pension and Postretirement Benefits [Roll Forward]
Balance January 1	-299	-384	-352
Adjustment to the Liability for Pension and Postretirement benefits, net of tax	-80	85	-32
Balance December 31	-379	-299	-384
Balance December 31	-545	-360	-408
Net income	226	183	275
Translation of foreign currency statements	-105	-37	6
Adjustment to the Liability for Pension and Postretirement benefits, net of tax	-80	85	-32
Other comprehensive income	-185	48	-26
Comprehensive Income	41	231	249
Noncontrolling Interests
Cumulative Translation Adjustment
Balance January 1	5	5	4
Translation of foreign currency statements	-2	0	1
Balance December 31	3	5	5
Additional Liability for Pension and Postretirement Benefits [Roll Forward]
Balance January 1	0	0	0
Balance December 31		0	0
Balance December 31	3	5	5
Net income	44	39	29
Translation of foreign currency statements	-2	0	1
Other comprehensive income	-2	0	1
Comprehensive Income	$42	$39	$30

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$282	[1]	$275	[1]
Restricted cash	3		5
Receivables —
Customer notes and accounts, net	1,064		1,041
Other	24		19
Inventories	688		656
Deferred income taxes	81		71
Prepayments and other	284		223
Total current assets	2,426		2,290
Other assets:
Long-term receivables, net	12		14
Goodwill	65		69
Intangibles, net	26		30
Deferred income taxes	143		125
Other	120		127
Total other assets	366		365
Plant, property, and equipment, at cost	3,490		3,498
Less — Accumulated depreciation and amortization	-2,272		-2,323
Plant, property and equipment, net	1,218		1,175
Total Assets	4,010		3,830
Current liabilities:
Short-term debt (including current maturities of long-term debt)	60		83
Accounts payable	1,372		1,359
Accrued taxes	40		40
Accrued interest	3		10
Accrued liabilities	258		252
Other	66		94
Total current liabilities	1,799		1,838
Long-term debt	1,069		1,019
Deferred income taxes	18		28
Postretirement benefits	339		249
Deferred credits and other liabilities	212		204
Commitments and contingencies
Total liabilities	3,437		3,338
Redeemable noncontrolling interests	35		20
Tenneco Inc. Shareholders’ equity:
Common stock	1		1
Premium on common stock and other capital surplus	3,059		3,014
Accumulated other comprehensive loss	-545		-360
Retained earnings (accumulated deficit)	-1,695		-1,921
Shareholders equity before deduction of treasury stock	820		734
Less — Shares held as treasury stock, at cost	323		301
Total Tenneco Inc. shareholders’ equity	497		433
Noncontrolling interests	41		39
Total equity	538		472
Total liabilities, redeemable noncontrolling interests and equity	$4,010		$3,830
[1]	Cash and cash equivalents include highly liquid investments with a maturity of three months or less at the date of purchase.

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Operating Activities
Net income	$270		$222		$304
Adjustments to reconcile net income to cash provided by operating activities —
Goodwill impairment charge	0		0		0
Depreciation and amortization of other intangibles	208		205		205
Deferred income taxes	-1		5		-65
Stock-based compensation	13		13		11
Loss on sale of assets	6		1		4
Changes in components of working capital —
(Increase) decrease in receivables	-83		-88		-9
(Increase) decrease in inventories	-74		3		-72
(Increase) decrease in prepayments and other current assets	-81		-53		-21
Increase (decrease) in payables	94		161		12
Increase (decrease) in accrued taxes	0		-10		7
Increase (decrease) in accrued interest	-6		0		-3
Increase (decrease) in other current liabilities	13		64		10
Change in long-term assets	12		7		14
Change in long-term liabilities	-13		-32		-37
Other	-17		5		5
Net cash provided by operating activities	341		503		365
Investing Activities
Proceeds from sale of assets	3		8		3
Cash payments for plant, property, and equipment	-328		-244		-256
Cash payments for software related intangible assets	-13		-25		-13
Cash payments for net assets purchased	-3		0		-7
Change in restricted cash	2		-5		0
Net cash used by investing activities	-339		-266		-273
Financing Activities
Retirement of long-term debt	-462		-16		-411
Issuance of long-term debt	570		0		250
Debt issuance costs of long-term debt	-12		0		-13
Purchase of common stock under the share repurchase program	-22		-27		-18
Issuance of common stock	19		20		5
Tax benefit from stock-based compensation	26		24		0
Increase (decrease) in bank overdrafts	6		-6		5
Net increase (decrease) in revolver borrowings and short-term debt excluding current maturities of long-term debt and short-term borrowings secured by accounts receivable	-70		-22		67
Net increase (decrease) in short-term borrowings secured by accounts receivable	-10		-40		50
Capital contribution from noncontrolling interest partner	5		0		5
Purchase of noncontrolling equity interest	0		-69		0
Distribution to noncontrolling interest partners	-30		-39		-29
Net cash provided (used) by financing activities	20		-175		-89
Effect of foreign exchange rate changes on cash and cash equivalents	-15		-10		6
Increase in cash and cash equivalents	7		52		9
Cash and cash equivalents, January 1	275	[1]	223	[1]	214
Cash and cash equivalents, December 31 (Note)	282	[1]	275	[1]	223	[1]
Supplemental Cash Flow Information
Cash paid during the year for interest	93		79		100
Cash paid during the year for income taxes (net of refunds)	136		109		80
Non-cash Investing and Financing Activities
Period end balance of trade payables for plant, property, and equipment	$41		$52		$42
[1]	Cash and cash equivalents include highly liquid investments with a maturity of three months or less at the date of purchase.

CONSOLIDATED_STATEMENTS_OF_CHA

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)	Total	Common Stock	Premium on Common Stock and Other Capital Surplus	Accumulated Other Comprehensive Loss	Retained Earnings (Accumulated Deficit)	Less - Common Stock Held as Treasury Stock, at Cost	Noncontrolling Interest
In Millions, except Share data, unless otherwise specified
Beginning Balance at Dec. 31, 2011		$1	$3,016	($382)	($2,379)	$256	$43
Beginning Balance (in shares) at Dec. 31, 2011		62,101,335				1,694,692
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issued pursuant to benefit plans (in shares)		149,398
Stock options exercised (in shares)		538,649
Purchase of noncontrolling equity interest	0		0
Premium on common stock issued pursuant to benefit plans			15
Other comprehensive income (loss)	-25			-26			1
Net income attributable to Tenneco Inc.	275				275		20
Purchase of common stock through stock repurchase program (in shares)						600,000
Purchase of common stock through stock repurchase program						18
Capital contribution							3
Other comprehensive income (loss)							1
Dividends declared							-22
Ending Balance at Dec. 31, 2012	291	1	3,031	-408	-2,104	274	45
Total Tenneco Inc. shareholders’ equity at Dec. 31, 2012						246
Ending Balance (in shares) at Dec. 31, 2012		62,789,382				2,294,692
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issued pursuant to benefit plans (in shares)		156,213
Stock options exercised (in shares)		769,133
Purchase of noncontrolling equity interest	-68		-68
Premium on common stock issued pursuant to benefit plans			51
Other comprehensive income (loss)	48			48			0
Net income attributable to Tenneco Inc.	183				183		24
Purchase of common stock through stock repurchase program (in shares)						550,000
Purchase of common stock through stock repurchase program						27
Capital contribution							0
Sale of noncontrolling equity interest							-1
Other comprehensive income (loss)							0
Dividends declared							-29
Ending Balance at Dec. 31, 2013	472	1	3,014	-360	-1,921	301	39
Total Tenneco Inc. shareholders’ equity at Dec. 31, 2013	433					433
Ending Balance (in shares) at Dec. 31, 2013		63,714,728				2,844,692
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issued pursuant to benefit plans (in shares)		62,334
Stock options exercised (in shares)		677,186
Purchase of noncontrolling equity interest	0		0
Premium on common stock issued pursuant to benefit plans			45
Other comprehensive income (loss)	-187			-185			-2
Net income attributable to Tenneco Inc.	226				226		21
Purchase of common stock through stock repurchase program (in shares)						400,000
Purchase of common stock through stock repurchase program						22
Sale of noncontrolling equity interest							0
Other comprehensive income (loss)							-1
Dividends declared							-18
Ending Balance at Dec. 31, 2014	538	1	3,059	-545	-1,695	323	41
Total Tenneco Inc. shareholders’ equity at Dec. 31, 2014	$497					$497
Ending Balance (in shares) at Dec. 31, 2014		64,454,248				3,244,692

Summary_of_Accounting_Policies

Summary of Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Accounting Policies	Summary of Accounting Policies
	Consolidation and Presentation
	Our consolidated financial statements include all majority-owned subsidiaries. We carry investments in 20 percent to 50 percent owned companies in which the Company does not have a controlling interest, as equity method investments, at cost plus equity in undistributed earnings since the date of acquisition and cumulative translation adjustments. We have eliminated intercompany transactions. We have evaluated all subsequent events through the date our financial statements were issued.
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates include, among others allowances for doubtful receivables, promotional and product returns, pension and postretirement benefit plans, income taxes, and contingencies. These items are covered in more detail elsewhere in Note 1, Note 7, Note 10, and Note 12 of the consolidated financial statements of Tenneco Inc. Actual results could differ from those estimates.
	Redeemable Noncontrolling Interests
	We have noncontrolling interests in five joint ventures with redemption features that could require us to purchase the noncontrolling interests at fair value in the event of a change in control of Tenneco Inc. or certain of our subsidiaries. We do not believe that it is probable that the redemption features in any of these joint venture agreements will be triggered. However, the redemption of these shares is not solely within our control. Accordingly, the related noncontrolling interests are presented as “Redeemable noncontrolling interests” in the temporary equity section of our consolidated balance sheets.
	In May 2014, we sold a 45 percent equity interest in Tenneco Fusheng (Chengdu) Automobile Parts Co., Ltd., to a third party for $4 million. As a result of the sale, our equity ownership of Tenneco Fusheng (Chengdu) Automobile Parts Co., Ltd. changed to 55 percent from 100 percent.
	The following is a rollforward of activity in our redeemable noncontrolling interests for the years ending December 31, 2014, 2013 and 2012, respectively:
		2014			2013			2012
		(Millions)
	Balance January 1	$	20		$	15		$	12
	Net income attributable to redeemable noncontrolling interests	23			14			9
	Sale of 45 percent equity interest from Tenneco Inc	4			—			—
	Capital Contributions	1			—			2
	Dividends declared	(13		)	(9		)	(8		)
	Balance December 31	$	35		$	20		$	15
	Inventories
	At December 31, 2014 and 2013, inventory by major classification was as follows:
		2014			2013
		(Millions)
	Finished goods	$	272		$	267
	Work in process	221			202
	Raw materials	137			130
	Materials and supplies	58			57
		$	688		$	656
	Our inventories are stated at the lower of cost or market value using the first-in, first-out (“FIFO”) or average cost methods.
	Goodwill and Intangibles, net
	We evaluate goodwill for impairment in the fourth quarter of each year, or more frequently if events indicate it is warranted. The goodwill impairment test consists of a two-step process. In step one, we compare the estimated fair value of our reporting units with goodwill to the carrying value of the unit’s assets and liabilities to determine if impairment exists within the recorded balance of goodwill. We estimate the fair value of each reporting unit using the income approach which is based on the present value of estimated future cash flows. The income approach is dependent on a number of factors, including estimates of market trends, forecasted revenues and expenses, capital expenditures, weighted average cost of capital and other variables. A separate discount rate derived by a combination of published sources, internal estimates and weighted based on our debt to equity ratio, was used to calculate the discounted cash flows for each of our reporting units. These estimates are based on assumptions that we believe to be reasonable, but which are inherently uncertain and outside of the control of management. If the carrying value of the reporting unit is higher than its fair value, there is an indication that impairment may exist which requires step two to be performed to measure the amount of the impairment loss. The amount of impairment is determined by comparing the implied fair value of a reporting unit’s goodwill to its carrying value.
	In the fourth quarter of 2014, 2013 and 2012, as a result of our annual goodwill impairment testing, the estimated fair value of each of our reporting units substantially exceeded the carrying value of their assets and liabilities as of the testing date.
	The changes in the net carrying amount of goodwill for the years ended December 31, 2014, 2013 and 2012 were as follows:
		Clean Air Division									Ride Performance Division
		North			Europe, South America & India			Asia			North			Europe, South America & India			Asia		Total
		America						Pacific			America						Pacific
	(Millions)
	Balance at December 31, 2012	$	14		$	14		$	—		$	10		$	34		$	—	$	72
	Translation Adjustment	—			—			—			—			(3		)	—		(3		)
	Balance at December 31, 2013	14			14			—			10			31			—		69
	Translation Adjustment	—			(2		)	—			—			(2		)	—		(4		)
	Balance at December 31, 2014	14			12			—			10			29			—		65
	We have capitalized certain intangible assets, primarily technology rights, trademarks and patents, based on their estimated fair value at the date we acquired them. We amortize our finite useful life intangible assets on a straight-line basis over periods ranging from 5 to 50 years. Amortization of intangibles amounted to $4 million in 2014, $5 million in 2013, and $5 million in 2012, and are included in the statements of income caption “Depreciation and amortization of intangibles.” The carrying amount and accumulated amortization of our finite useful life intangible assets were as follows:
		31-Dec-14						31-Dec-13
		Gross Carrying			Accumulated			Gross Carrying			Accumulated
		Value			Amortization			Value			Amortization
		(Millions)						(Millions)
	Customer contract	$	8		$	(4	)	$	8		$	(4	)
	Patents	3			(2		)	3			(2		)
	Technology rights	26			(15		)	26			(12		)
	Other	11			(2		)	11			(1		)
	Total	$	48		$	(23	)	$	48		$	(19	)
	Estimated amortization of intangible assets over the next five years is expected to be $4 million in 2015, $3 million in 2016, $3 million in 2017, $2 million in 2018 and $1 million in 2019. We have capitalized indefinite life intangibles of $1 million relating to purchased trademarks from our Marzocchi® acquisition in 2008.
	Plant, Property, and Equipment, at Cost
	At December 31, 2014 and 2013, plant, property, and equipment, at cost, by major category were as follows:
		2014			2013
		(Millions)
	Land, buildings, and improvements	$	569		$	579
	Machinery and equipment	2,655			2,673
	Other, including construction in progress	266			246
		$	3,490		$	3,498
	We depreciate these properties excluding land on a straight-line basis over the estimated useful lives of the assets. Useful lives range from 10 to 50 years for buildings and improvements and from 3 to 25 years for machinery and equipment.
	Notes and Accounts Receivable and Allowance for Doubtful Accounts
	Receivables consist of amounts billed and currently due from customers and unbilled pre-production design and development costs. Short and long-term accounts receivable outstanding were $1,088 million and $1,065 million at December 31, 2014 and 2013, respectively. The allowance for doubtful accounts on short-term and long-term accounts receivable was $16 million and $14 million at December 31, 2014 and 2013, respectively. Short and long-term notes receivable outstanding was $5 million at both December 31, 2014 and 2013. The allowance for doubtful accounts on short-term and long-term notes receivable was zero at both December 31, 2014 and 2013.
	Pre-production Design and Development and Tooling Assets
	We expense pre-production design and development costs as incurred unless we have a contractual guarantee for reimbursement from the original equipment customer. Unbilled pre-production design and development costs recorded in prepayments and other and long-term receivables were $23 million and $30 million at December 31, 2014 and 2013, respectively. In addition, plant, property and equipment included $59 million at both December 31, 2014 and 2013, for original equipment tools and dies that we own, and prepayments and other included $98 million and $86 million at December 31, 2014 and 2013, respectively, for in-process tools and dies that we are building for our original equipment customers.
Internal Use Software Assets
We capitalize certain costs related to the purchase and development of software that we use in our business operations. We amortize the costs attributable to these software systems over their estimated useful lives, ranging from 3 to 12 years, based on various factors such as the effects of obsolescence, technology, and other economic factors. Capitalized software development costs, net of amortization, were $54 million and $55 million at December 31, 2014 and 2013, respectively, and are recorded in other long-term assets. Amortization of software development costs was approximately $15 million, $15 million and $15 million for the years ended December 31, 2014, 2013 and 2012, respectively, and is included in the statements of income (loss) caption “Depreciation and amortization of intangibles.” Additions to capitalized software development costs, including payroll and payroll-related costs for those employees directly associated with developing and obtaining the internal use software, are classified as investing activities in the statements of cash flows.
Income Taxes
We recognize deferred tax assets and liabilities on the basis of the future tax consequences attributable to temporary differences that exist between the financial statement carrying value of assets and liabilities and their respective tax values, and net operating losses ("NOL") and tax credit carryforwards on a taxing jurisdiction basis. We measure deferred tax assets and liabilities using enacted tax rates that will apply in the years in which we expect the temporary differences to be recovered or paid.
We evaluate our deferred income taxes quarterly to determine if valuation allowances are required or should be adjusted. U.S. GAAP requires that companies assess whether valuation allowances should be established against their deferred tax assets based on consideration of all available evidence, both positive and negative, using a “more likely than not” standard. This assessment considers, among other matters, the nature, frequency and amount of recent losses, the duration of statutory carryforward periods, and tax planning strategies. In making such judgments, significant weight is given to evidence that can be objectively verified.
Valuation allowances have been established in certain foreign jurisdictions for deferred tax assets based on a “more likely than not” threshold. The ability to realize deferred tax assets depends on our ability to generate sufficient taxable income within the carryforward periods provided for in the tax law for each tax jurisdiction. We have considered the following possible sources of taxable income when assessing the realization of our deferred tax assets:
•	Future reversals of existing taxable temporary differences;
•	Taxable income or loss, based on recent results, exclusive of reversing temporary differences and carryforwards;
•	Tax-planning strategies; and
•	Taxable income in prior carryback years if carryback is permitted under the relevant tax law.
The valuation allowances recorded against deferred tax assets generated by taxable losses in foreign jurisdictions will impact our provision for income taxes until the valuation allowances are released. Our provision for income taxes will include no tax benefit for losses incurred and no tax expense with respect to income generated in these jurisdictions until the respective valuation allowance is eliminated.
Revenue Recognition
We recognize revenue for sales to our original equipment and aftermarket customers when title and risk of loss passes to the customers under the terms of our arrangements with those customers, which is usually at the time of shipment from our plants or distribution centers. Generally, in connection with the sale of exhaust systems to certain original equipment manufacturers, we purchase catalytic converters and diesel particulate filters or components thereof including precious metals (“substrates”) on behalf of our customers which are used in the assembled system. These substrates are included in our inventory and “passed through” to the customer at our cost, plus a small margin, since we take title to the inventory and are responsible for both the delivery and quality of the finished product. Revenues recognized for substrate sales were $1,934 million, $1,835 million and $1,660 million in 2014, 2013 and 2012, respectively. For our aftermarket customers, we provide for promotional incentives and returns at the time of sale. Estimates are based upon the terms of the incentives and historical experience with returns. Certain taxes assessed by governmental authorities on revenue producing transactions, such as value added taxes, are excluded from revenue and recorded on a net basis. Shipping and handling costs billed to customers are included in revenues and the related costs are included in cost of sales in our consolidated statements of income (loss).
Warranty Reserves
Where we have offered product warranty, we also provide for warranty costs. Provisions for estimated expenses related to product warranty are made at the time products are sold or when specific warranty issues are identified on OE products. These estimates are established using historical information about the nature, frequency, and average cost of warranty claims and upon specific warranty issues as they arise. The warranty terms vary but range from one year up to limited lifetime warranties on some of our premium aftermarket products. We actively study trends of our warranty claims and take action to improve product quality and minimize warranty claims. While we have not experienced any material differences between these estimates and our actual costs, it is reasonably possible that future warranty issues could arise that could have a significant impact on our consolidated financial statements.
Earnings Per Share
We compute basic earnings per share by dividing income available to common shareholders by the weighted-average number of common shares outstanding. The computation of diluted earnings per share is similar to the computation of basic earnings per share, except that we adjust the weighted-average number of shares outstanding to include estimates of additional shares that would be issued if potentially dilutive common shares had been issued. In addition, we adjust income available to common shareholders to include any changes in income or loss that would result from the assumed issuance of the dilutive common shares. See Note 2 to the consolidated financial statements of Tenneco Inc.
Engineering, Research and Development
We expense engineering, research, and development costs as they are incurred. Engineering, research, and development expenses were $169 million for 2014, $144 million for 2013, and $126 million for 2012, net of reimbursements from our customers. Our customers reimburse us for engineering, research, and development costs on some platforms when we prepare prototypes and incur costs before platform awards. Our engineering, research, and development expense for 2014, 2013 and 2012 has been reduced by $159 million, $169 million and $159 million, respectively, for these reimbursements.
Advertising and Promotion Expenses
We expense advertising and promotion expenses as they are incurred. Advertising and promotion expenses were $57 million, $53 million, and $54 million for the years ended December 31, 2014, 2013, and 2012, respectively.
Foreign Currency Translation
We translate the consolidated financial statements of foreign subsidiaries into U.S. dollars using the exchange rate at each balance sheet date for assets and liabilities and a weighted-average exchange rate for revenues and expenses in each period. We record translation adjustments for those subsidiaries whose local currency is their functional currency as a component of accumulated other comprehensive income (loss) in shareholders’ equity. We recognize transaction gains and losses arising from fluctuations in currency exchange rates on transactions denominated in currencies other than the functional currency in earnings as incurred, except for those transactions which hedge purchase commitments and for those intercompany balances which are designated as long-term investments. Our results include foreign currency transaction losses of $1 million in 2014, of $13 million in 2013 and $8 million in 2012. The amounts are recorded in cost of sales.
Risk Management Activities
We use derivative financial instruments, principally foreign currency forward purchase and sales contracts with terms of less than one year, to hedge our exposure to changes in foreign currency exchange rates. Our primary exposure to changes in foreign currency rates results from intercompany loans made between affiliates to minimize the need for borrowings from third parties. Additionally, we enter into foreign currency forward purchase and sale contracts to mitigate our exposure to changes in exchange rates on certain intercompany and third-party trade receivables and payables. We manage counter-party credit risk by entering into derivative financial instruments with major financial institutions that can be expected to fully perform under the terms of such agreements. We do not enter into derivative financial instruments for speculative purposes. In managing our foreign currency exposures, we identify and aggregate existing offsetting positions and then hedge residual exposures through third-party derivative contracts. The fair value of our foreign currency forward contracts was a net liability position of less than $1 million at both December 31, 2014 and 2013 and is based on an internally developed model which incorporates observable inputs including quoted spot rates, forward exchange rates and discounted future expected cash flows utilizing market interest rates with similar quality and maturity characteristics. We record the change in fair value of these foreign exchange forward contracts as part of currency gains (losses) within cost of sales in the consolidated statements of income (loss). The fair value of foreign exchange forward contracts are recorded in prepayments and other current assets or other current liabilities in the consolidated balance sheet.
New Accounting Pronouncements
In May 2014, the Financial Accounting Standards Board (“FASB”) issued an amendment on revenue recognition. The amendment in this update creates Topic 606, Revenue from Contracts with Customers, and supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, including most industry-specific revenue recognition guidance throughout the Industry Topics of the Codification. In addition, the amendment supersedes the cost guidance in Subtopic 605-35, Revenue Recognition-Construction-Type and Production-Type Contracts, and creates new Subtopic 340-40, Other Assets and Deferred Costs-Contracts with Customers. The core principle of Topic 606 is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendment is effective for reporting periods beginning after December 15, 2016 for public entities. We will adopt this amendment on January1, 2017. We are currently evaluating the potential impact of this new guidance on our consolidated financial statements.
Restricted Net Assets
In certain countries where we operate, transfers of funds out of such countries by way of dividends, loans or advances are subject to certain central bank restrictions which require approval from the central bank authorities prior to transferring funds out of these countries. The countries in which we operate that have such restrictions include Argentina, China, South Africa, and Thailand. The net asset balance of our subsidiaries in the countries in which we operate that have such restrictions was $218 million and $177 million as of December 31, 2014 and 2013, respectively. These central banking restrictions do not have a significant effect on our ability to manage liquidity on a global basis.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Earnings Per Share	Earnings Per Share
	Earnings per share of common stock outstanding were computed as follows:
		Year Ended December 31,
		2014		2013		2012
		(Millions Except Share and Per Share Amounts)
	Basic earnings per share —
	Net income attributable to Tenneco Inc.	$	226	$	183	$	275
	Average shares of common stock outstanding	60,734,022		60,474,492		59,985,677
	Earnings per average share of common stock	$	3.72	$	3.03	$	4.58
	Diluted earnings per share —
	Net income attributable to Tenneco Inc.	$	226	$	183	$	275
	Average shares of common stock outstanding	60,734,022		60,474,492		59,985,677
	Effect of dilutive securities:
	Restricted stock	130,732		205,020		140,609
	Stock options	917,754		914,550		957,224
	Average shares of common stock outstanding including dilutive securities	61,782,508		61,594,062		61,083,510
	Earnings per average share of common stock	$	3.66	$	2.97	$	4.5
	Options to purchase 1,357, 205,104 and 521,249 shares of common stock were outstanding as of December 31, 2014, 2013 and 2012, respectively, but not included in the computation of diluted earnings per share, because the options were anti-dilutive.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Acquisitions	Acquisitions and divestitures
	In September 2012, we purchased certain rights from Combustion Components Associates, Inc. primarily pertaining to emission control technology for stationary reciprocating engine applications for $7 million in cash.
	In the fourth quarter of 2013, we purchased an additional 20 percent equity interest in Tenneco Tongtai (Dalian) Exhaust System Co., Ltd. (TTEC) joint venture investment in China for $69 million in cash through two transactions. The joint venture partner also received an additional amount of $9 million in lieu of receiving its pro-rata share of dividends owed from the joint venture. As a result of the purchase, TTEC became a wholly owned indirect subsidiary of Tenneco.
	In May 2014, we sold a 45 percent equity interest in Tenneco Fusheng (Chengdu) Automobile Parts Co., Ltd., to a third party for $4 million. As a result of the sale, our equity ownership of Tenneco Fusheng (Chengdu) Automobile Parts Co., Ltd. changed to 55 percent from 100 percent. The net impact to equity from the sale was less than $1 million.
	The table below summaries the net income attributable to Tenneco Inc. and transfers to the noncontrolling interest:
		Year Ended December 31,
		2014		2013			2012
		(Millions)
	Net income attributable to Tenneco Inc.	$	226	$	183		$	275
	Decrease in equity for purchase of noncontrolling equity interest	—		(68		)	—
	Net income attributable to Tenneco Inc. shareholders less purchase of noncontrolling equity interest	226		115			275

Restructuring_and_Other_Charge

Restructuring and Other Charges	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Restructuring and Other Charges	Restructuring and Other Charges
	Over the past several years, we have adopted plans to restructure portions of our operations. These plans were approved by our Board of Directors and were designed to reduce operational and administrative overhead costs throughout the business. In 2012, we incurred $13 million in restructuring and related costs, primarily related to headcount reductions in South America and non-cash asset write downs of $4 million in Europe, of which $10 million was recorded in cost of sales and $3 million was recorded in SG&A. In 2013, we incurred $78 million in restructuring and related costs, primarily related to European cost reduction efforts including non-cash asset write downs of $3 million, the costs to exit the distribution of aftermarket exhaust products and ending production of leaf springs in Australia, headcount reductions in various regions, and the net impact of freezing our defined benefit plans in the United Kingdom, of which $70 million was recorded in cost of sales, $6 million in SG&A, $1 million in engineering expense and $1 million in other expense. In 2014, we incurred $49 million in restructuring and related costs including non-cash charges of $5 million, primarily related to European cost reduction efforts, headcount reductions in Australia and South America, the sale of a closed facility in Cozad, Nebraska and costs related to organizational change, of which $28 million was recorded in cost of sales, $9 million in SG&A, $7 million in engineering expense, $4 million in other expense and $1 million in depreciation and amortization.
	Amounts related to activities that are part of our restructuring plans are as follows:
		December 31,		2014	2014		Impact of Exchange Rates		December 31,
		2013		Expenses	Cash				2014
		Restructuring			Payments				Restructuring
		Reserve							Reserve
		(Millions)
	Employee Severance, Termination Benefits and Other Related Costs	$	44	44	(43	)	(5	)	$	40
	On January 31, 2013, we announced our intent to reduce structural costs in Europe by approximately $60 million annually, and anticipate related costs of approximately $120 million, which includes the closing of the Vittaryd facility in Sweden that we announced in September 2012 and a $7 million charge recorded in the fourth quarter of 2012 related to the impairment of certain assets in the European ride performance business. Any plans affecting our European hourly and salaried workforce have been and will be subject to consultation with the relevant employee representatives. We incurred $78 million in restructuring and related costs in 2013, of which $69 million was related to this initiative including $3 million for non-cash asset write downs. In 2014, we incurred $49 million in restructuring and related costs, of which $31 million was related to this initiative including $3 million for non-cash asset write downs. As part of our European structural cost reduction initiative, on September 5, 2013, we announced our intent to close our ride performance plant in Gijon, Spain and reduce the workforce at our ride performance plant in Sint-Truiden, Belgium. The actions were subject to consultation with the relevant employee representatives and in total would eliminate approximately 480 jobs in Western Europe while allowing the most efficient use of our capital assets and production capacity across the region. We concluded the consultation period with employee representatives at Gijon without having reached agreement and on December 17, 2013 notified the Gijon employees' works council that the Company was proceeding with the plant closure. Employee terminations at Gijon were completed by the end of 2013. During the first quarter of 2014, the employees' works council filed suit challenging the decision to close the Gijon plant and the local High Court of Justice of Asturias ruled in favor of the employees' works council. On February 25, 2014, we announced the intention of the Company to appeal that decision to the Supreme Court of Spain in Madrid and at the same time we worked closely with local and European government officials to reach a solution to address the challenge to our restructuring plan by the Gijon plant's employees' works council. In July 2014, we finalized an agreement related to the restructuring with employee representatives at Gijon. In the same month, we also finalized an agreement related to the Sint Truiden restructuring with employee representatives. Under the final agreement for Gijon, the plant re-opened in July 2014 with about half of its prior workforce and will continue to be operated by Tenneco until a complete transfer of ownership takes place in 2016. In the first quarter of 2014, we announced and finalized the closure of the clean air just-in-time plant in Iwuy, France, due to reduced demand for the plant's products. The actions were subject to the required consultation process with the relevant employee representatives.
	Under the terms of our amended and restated senior credit agreement that took effect on December 8, 2014, we are allowed to exclude up to $150 million in the aggregate of all costs, expenses, fees, fines, penalties, judgments, legal settlements and other amounts associated with any restructuring, litigation, claim, proceeding or investigation related to or undertaken by us or any of our subsidiaries, together with any related provision for taxes, incurred after December 8, 2014 in the calculation of the financial covenant ratios required under our senior credit facility. As of December 31, 2014, we have not excluded any allowable charges relating to restructuring initiatives against the $150 million available under the terms of the senior credit facility.

LongTerm_Debt_ShortTerm_Debt_a

Long-Term Debt, Short-Term Debt, and Financing Arrangements	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Long-Term Debt, Short-Term Debt, and Financing Arrangements	Long-Term Debt, Short-Term Debt, and Financing Arrangements
	Long-Term Debt
	A summary of our long-term debt obligations at December 31, 2014 and 2013, is set forth in the following table:
		2014				2013
		(Millions)
	Tenneco Inc. —
	Revolver borrowings due 2017, average effective interest rate 2.7% in 2013	$	—			$	58
	Revolver borrowings due 2019, average effective interest rate 2.6% in 2014	—				—
	Senior Tranche A Term Loan due 2014 through 2017, average effective interest rate 2.7% in 2013	—				228
	Senior Tranche A Term Loan due 2015 through 2019, average effective interest rate 1.9% in 2014	300				—
	7 3/4% Senior Notes due 2018	—				225
	5 3/8% Senior Notes due 2024	225				—
	6 7/8% Senior Notes due 2020	500				500
	Debentures due 2015 through 2026, average effective interest rate 7.5% in 2014 and 7.5% in 2013	1				1
	Other subsidiaries —
	Other Long Term Debt due in 2019, average interest rate 5.45% in 2014	37				—
	Notes due 2015 through 2026, average effective interest rate 1.3% in both 2014 and 2013	8				9
		1,071				1,021
	Less — maturities classified as current	2				2
	Total long-term debt	$	1,069			$	1,019
	The aggregate maturities applicable to the long-term debt outstanding at December 31, 2014, are $16 million, $16 million, $24 million, $31 million and $255 million for 2015, 2016, 2017, 2018 and 2019, respectively.
	We have excluded the required payments, within the next twelve months, under the Tranche A Term Facility totaling $15 million from current liabilities as of December 31, 2014, because we have the intent and ability to refinance the obligations on a long-term basis by using our revolving credit facility.
	Short-Term Debt
	Our short-term debt includes the current portion of long-term obligations and borrowings by parent company and foreign subsidiaries. Information regarding our short-term debt as of and for the years ended December 31, 2014 and 2013 is as follows:
		2014				2013
		(Millions)
	Maturities classified as current	$	2			$	2
	Short-term borrowings	58				81
	Total short-term debt	$	60			$	83
		Notes Payable(a)
		2014				2013
		(Dollars in Millions)
	Outstanding borrowings at end of year	$	58			$	81
	Weighted average interest rate on outstanding borrowings at end of year(b)	2.6		%		4.4		%
	Maximum month-end outstanding borrowings during year	$	124			$	177
	Average month-end outstanding borrowings during year	$	107			$	116
	Weighted average interest rate on average month-end outstanding borrowings during year(b)	4		%		4.7		%
	(a)	Includes borrowings under both committed credit facilities and uncommitted lines of credit and similar arrangements.
	(b)	This calculation does not include the commitment fees to be paid on the unused revolving credit facility balances which are recorded as interest expense for accounting purposes.
	Financing Arrangements
		Committed Credit Facilities(a) as of December 31, 2014
		Term		Commitments				Borrowings			Letters of			Available
											Credit(b)
		(Millions)
	Tenneco Inc. revolving credit agreement	2019		1,200				—			34			1,166
	Tenneco Inc. tranche A term facility	2019		300				300			—			—
	Subsidiaries’ credit agreements	2015-2026		152				104			—			48
				$	1,652			$	404		$	34		$	1,214
	(a)	We generally are required to pay commitment fees on the unused portion of the total commitment.
	(b)	Letters of credit reduce the available borrowings under the revolving credit agreement.
	Overview.    Our financing arrangements are primarily provided by a committed senior secured financing arrangement with a syndicate of banks and other financial institutions. The arrangement is secured by substantially all our domestic assets and pledges of up to 66 percent of the stock of certain first-tier foreign subsidiaries, as well as guarantees by our material domestic subsidiaries.
	On December 8, 2014, we completed an amendment and restatement of our senior credit facility by increasing the amounts and extending the maturity dates of our revolving credit facility and our Tranche A Term Facility. The amended and restated facility replaces our former $850 million revolving credit facility and $213 million Tranche A Term Facility. The proceeds from this refinancing transaction were used to repay the $213 million Tranche A Term Facility, to fund the fees and expenses associated with the purchase and redemption of our $225 million 7 3/4 percent senior notes due in 2018 and for general corporate purposes. As of December 31, 2014, the senior credit facility provides us with a total revolving credit facility size of $1,200 million and a $300 million Tranche A Term Facility, both of which will mature on December 8, 2019. Funds may be borrowed, repaid and re-borrowed under the revolving credit facility without premium or penalty (subject to any customary LIBOR breakage fees). The revolving credit facility is reflected as debt on our balance sheet only if we borrow money under this facility or if we use the facility to make payments for letters of credit. Outstanding letters of credit reduce our availability to borrow revolving loans under the facility. We are required to make quarterly principal payments under the Tranche A Term Facility of $3.75 million through December 31, 2016, $5.625 million beginning March 31, 2017 through December 31, 2017, $7.5 million beginning March 31, 2018 through September 30, 2019 and a final payment of $195 million is due on December 8, 2019. We have excluded the required payments, within the next twelve months, under the Tranche A Term Facility totaling $15 million from current liabilities as of December 31, 2014, because we have the intent and ability to refinance the obligations on a long-term basis by using our revolving credit facility.
	On November 20, 2014, we announced a cash tender offer to purchase our outstanding $225 million 7 3/4 percent senior notes due in 2018 and a solicitation of consents to certain proposed amendments to the indenture governing these notes. We received tenders and consents representing $181 million aggregate principal amount of the notes and, on December 5, 2014, we purchased the tendered notes at a price of 104.35 percent of the principal amount (which includes a consent payment of three percent of the principal amount), plus accrued and unpaid interest, and amended the related indenture. On December 22, 2014, we redeemed the remaining outstanding $44 million aggregate principal amount of senior notes that were not purchased pursuant to the tender offer at a price of 103.88 percent of the principal amount, plus accrued and unpaid interest. The additional liquidity provided by the new $1,200 million revolving credit facility and the new $300 million Tranche A Term Facility was used in part to fund the fees and expenses of the tender offer and redemption.
	We recorded $13 million of pre-tax interest charges in December 2014 related to the refinancing of our senior credit facility, the repurchase and redemption of our 7  3/4 percent senior notes due in 2018 and the write-off of deferred debt issuance costs relating to those notes.
	At December 31, 2014, of the $1,200 million available under the revolving credit facility, we had unused borrowing capacity of $1,166 million with zero balance in outstanding borrowings and $34 million in outstanding letters of credit. As of December 31, 2014, our outstanding debt also included $300 million related to our Tranche A Term Facility due December 8, 2019, $225 million of 5 3/8 percent senior notes due December 15, 2024, $500 million of 6 7/8 percent senior notes due December 15, 2020, and $104 million of other debt.
	Senior Credit Facility — Interest Rates and Fees.    Beginning December 8, 2014, our Tranche A Term Facility and revolving credit facility bear interest at an annual rate equal to, at our option, either (i) London Interbank Offered Rate (“LIBOR”) plus a margin of 175 basis points, or (ii) a rate consisting of the greater of (a) the JPMorgan Chase prime rate plus a margin of 75 basis points, (b) the Federal Funds rate plus 50 basis points plus a margin of 75 basis points, and (c) one month LIBOR plus 100 basis points plus a margin of 75 basis points. The margin we pay on these borrowings will be increased by a total of 25 basis points above the original margin following each fiscal quarter for which our consolidated net leverage ratio is equal to or greater than 2.25 and less than 3.25, and will be increased by a total of 50 basis points above the original margin following each fiscal quarter for which our consolidated net leverage ratio is equal to or greater than 3.25. In addition, beginning after we deliver financial statements for the fiscal quarter ending September 30, 2015, the margin we pay on these borrowings will be reduced by a total of 25 basis points below the original margin if our consolidated net leverage ratio is less than 1.25. We also pay a commitment fee equal to 30 basis points that will be reduced to 25 basis points or increased to up to 40 basis points depending on consolidated net leverage ratio changes as set forth in the senior credit facility.
	Senior Credit Facility — Other Terms and Conditions.    Our senior credit facility requires that we maintain financial ratios equal to or better than the following consolidated net leverage ratio (consolidated indebtedness net of cash divided by consolidated EBITDA, as defined in the senior credit facility agreement), and consolidated interest coverage ratio (consolidated EBITDA divided by consolidated interest expense, as defined in the senior credit facility agreement) at the end of each period indicated. Failure to maintain these ratios will result in a default under our senior credit facility. The financial ratios required under the amended and restated senior credit facility (or the predecessor facility, as applicable) and the actual ratios we achieved for the four quarters of 2014, are as follows:
		Quarter Ended
		December 31,						September 30,					June 30,			March 31,
		2014						2014					2014			2014
		Req.			Act.			Req.		Act.			Req.		Act.	Req.	Act.
	Leverage Ratio (maximum)	3.5			1.22			3.5		1.55			3.5		1.57	3.5	1.63
	Interest Coverage Ratio (minimum)	3.75			11.4			2.75		10.99			2.75		10.62	2.75	10.39
	The senior credit facility includes a maximum leverage ratio covenant of 3.50 and a minimum interest coverage ratio of 2.75 through December 8, 2019.
The covenants in our senior credit facility agreement generally prohibit us from repaying or refinancing our senior notes. So long as no default existed, we would, however, under our senior credit facility agreement, be permitted to repay or refinance our senior notes (i) with the net cash proceeds of permitted refinancing indebtedness (as defined in the senior credit facility agreement) or with the net cash proceeds of our common stock in each case issued within 180 days prior to such repayment; (ii) with the net cash proceeds of the incremental facilities (as defined in the senior credit facility agreement) and certain indebtedness incurred by our foreign subsidiaries; (iii) with the proceeds of the revolving loans (as defined in the senior credit facility agreement); (iv) with the cash generated by our operations; (v) in an amount equal to the net cash proceeds of qualified capital stock (as defined in the senior credit facility agreement) issued by us after December 8, 2014; and (vi) in exchange for permitted refinancing indebtedness or in exchange for shares of our common stock; provided that such purchases are capped as follows (with respect to clauses (iii), (iv) and (v) based on a pro forma consolidated leverage ratio after giving effect to such purchase, cancellation or redemption):
Pro forma Consolidated	Aggregate Senior
Leverage Ratio	Note Maximum Amount
	(Millions)
Greater than or equal to 3.0x	$	20
Greater than or equal to 2.5x	$	100
Greater than or equal to 2.0x	$	200
Less than 2.0x	no limit
Although the senior credit facility agreement would permit us to repay or refinance our senior notes under the conditions described above, any repayment or refinancing of our outstanding notes would be subject to market conditions and either the voluntary participation of note holders or our ability to redeem the notes under the terms of the applicable note indenture. For example, while the senior credit facility agreement would allow us to repay our outstanding notes via a direct exchange of the notes for either permitted refinancing indebtedness or for shares of our common stock, we do not, under the terms of the agreements governing our outstanding notes, have the right to refinance the notes via any type of direct exchange.
The senior credit facility agreement also contains other restrictions on our operations that are customary for similar facilities, including limitations on: (i) incurring additional liens; (ii) sale and leaseback transactions (except for the permitted transactions as described in the senior credit facility agreement); (iii) liquidations and dissolutions; (iv) incurring additional indebtedness or guarantees; (v) investments and acquisitions; (vi) dividends and share repurchases; (vii) mergers and consolidations; and (viii) refinancing of the senior notes. Compliance with these requirements and restrictions is a condition for any incremental borrowings under the senior credit facility agreement and failure to meet these requirements enables the lenders to require repayment of any outstanding loans.
As of December 31, 2014, we were in compliance with all the financial covenants and operational restrictions of the senior credit facility. Our senior credit facility does not contain any terms that could accelerate payment of the facility or affect pricing under the facility as a result of a credit rating agency downgrade.
Senior Notes.    As of December 31, 2014, our outstanding senior notes included $225 million of 5 3/8 percent senior notes due December 15, 2024 and $500 million of 6 7/8 percent senior notes due December 15, 2020. Under the indentures governing the notes, we are permitted to redeem some or all of the remaining senior notes at specified prices that decline to par over a specified period, (a) on or after December 15, 2019, in the case of the senior notes due 2024, and (b) December 15, 2015, in the case of the senior notes due 2020. In addition, the notes may also be redeemed at a price generally equal to 100 percent of the principal amount thereof plus a premium based on the present values of the remaining payments due to the noteholders. Further, the indentures governing the notes also permit us to redeem up to 35 percent of the senior notes due 2024, with the proceeds of certain equity offerings completed on or before December 15, 2017. If we sell certain of our assets or experience specified kinds of changes in control, we must offer to repurchase the notes due 2024 and 2020 at 101 percent of the principal amount thereof plus accrued and unpaid interest.
Our senior notes require that, as a condition precedent to incurring certain types of indebtedness not otherwise permitted, our consolidated fixed charge coverage ratio, as calculated on a pro forma basis, be greater than 2.00. The indentures also contain restrictions on our operations, including limitations on: (i) incurring additional indebtedness or liens; (ii) dividends; (iii) distributions and stock repurchases; (iv) investments; (v) asset sales and (vi) mergers and consolidations. Subject to limited exceptions, all of our existing and future material domestic wholly owned subsidiaries fully and unconditionally guarantee these notes on a joint and several basis. There are no significant restrictions on the ability of the subsidiaries that have guaranteed these notes to make distributions to us. As of December 31, 2014, we were in compliance with the covenants and restrictions of these indentures.
Accounts Receivable Securitization.    We securitize some of our accounts receivable on a limited recourse basis in North America and Europe. As servicer under these accounts receivable securitization programs, we are responsible for performing all accounts receivable administration functions for these securitized financial assets including collections and processing of customer invoice adjustments. In North America, we have an accounts receivable securitization program with three commercial banks comprised of a first priority facility and a second priority facility. We securitize original equipment and aftermarket receivables on a daily basis under the bank program. In March 2014, the North American program was amended and extended to March 20, 2015. The first priority facility continues to provide financing of up to $110 million and the second priority facility, which is subordinated to the first priority facility, continues to provide up to an additional $40 million of financing. Both facilities monetize accounts receivable generated in the U.S. and Canada that meet certain eligibility requirements. The second priority facility also monetizes certain accounts receivable generated in the U.S. or Canada that would otherwise be ineligible under the first priority securitization facility. The amount of outstanding third-party investments in our securitized accounts receivable under the North American program was zero at December 31, 2014 and $10 million at December 31, 2013.
Each facility contains customary covenants for financings of this type, including restrictions related to liens, payments, mergers or consolidations and amendments to the agreements underlying the receivables pool. Further, each facility may be terminated upon the occurrence of customary events (with customary grace periods, if applicable), including breaches of covenants, failure to maintain certain financial ratios, inaccuracies of representations and warranties, bankruptcy and insolvency events, certain changes in the rate of default or delinquency of the receivables, a change of control and the entry or other enforcement of material judgments. In addition, each facility contains cross-default provisions, where the facility could be terminated in the event of non-payment of other material indebtedness when due and any other event which permits the acceleration of the maturity of material indebtedness.
We also securitize receivables in our European operations with regional banks in Europe. The arrangements to securitize receivables in Europe are provided under six separate facilities provided by various financial institutions in each of the foreign jurisdictions. The commitments for these arrangements are generally for one year, but some may be cancelled with notice 90 days prior to renewal. In some instances, the arrangement provides for cancellation by the applicable financial institution at any time upon notification. The amount of outstanding third-party investments in our securitized accounts receivable in Europe was $153 million and $134 million at December 31, 2014 and December 31, 2013, respectively.
If we were not able to securitize receivables under either the North American or European securitization programs, our borrowings under our revolving credit agreement might increase. These accounts receivable securitization programs provide us with access to cash at costs that are generally favorable to alternative sources of financing, and allow us to reduce borrowings under our revolving credit agreement.
In our North American accounts receivable securitization programs, we transfer a partial interest in a pool of receivables and the interest that we retain is subordinate to the transferred interest. Accordingly, we account for our North American securitization program as a secured borrowing. In our European programs, we transfer accounts receivables in their entirety to the acquiring entities and satisfy all of the conditions established under ASC Topic 860, “Transfers and Servicing,” to report the transfer of financial assets in their entirety as a sale. The fair value of assets received as proceeds in exchange for the transfer of accounts receivable under our European securitization programs approximates the fair value of such receivables. We recognized $2 million in interest expense for each of the years ended 2014 and 2013 and $3 million in interest expense for the year ended 2012, respectively, relating to our North American securitization program. In addition, we recognized a loss of $4 million for each of the years ended 2014, 2013 and 2012, on the sale of trade accounts receivable in our European accounts receivable securitization programs, representing the discount from book values at which these receivables were sold to our banks. The discount rate varies based on funding costs incurred by our banks, which averaged approximately two percent for the year ended 2014 and three percent for each of the years ended 2013 and 2012, respectively.

Financial_Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Financial Instruments	Financial Instruments
	The carrying and estimated fair values of our financial instruments by class at December 31, 2014 and 2013 were as follows:
		31-Dec-14					31-Dec-13
		Carrying			Fair		Carrying		Fair
		Amount			Value		Amount		Value
		(Millions)
	Long-term debt (including current maturities)	$	1,071		$	1,106	$	1,021	$	1,089
	Instruments with off-balance sheet risk:
	Foreign exchange forward contracts:
	Asset derivative contracts	—			—		—		—
	Asset and Liability Instruments — The fair value of cash and cash equivalents, short and long-term receivables, accounts payable, and short-term debt was considered to be the same as or was not determined to be materially different from the carrying amount.
	Long-term Debt — The fair value of our public fixed rate senior notes is based on quoted market prices. The fair value of our private borrowings under our senior credit facility and other long-term debt instruments is based on the market value of debt with similar maturities, interest rates and risk characteristics. The fair value of our level 1 debt, as classified in the fair value hierarchy, was $759 million and $792 million at December 31, 2014 and December 31, 2013, respectively. We have classified the $301 million and $287 million as level 2 in the fair value hierarchy at December 31, 2014 and December 31, 2013, respectively, since we utilize valuation inputs that are observable both directly and indirectly. We classified the remaining $46 million and $10 million, consisting of foreign subsidiary debt, as level 3 in the fair value hierarchy at December 31, 2014, and December 31, 2013, respectively.
	Foreign exchange forward contracts — We use derivative financial instruments, principally foreign currency forward purchase and sales contracts with terms of less than one year, to hedge our exposure to changes in foreign currency exchange rates. Our primary exposure to changes in foreign currency rates results from intercompany loans made between affiliates to minimize the need for borrowings from third parties. Additionally, we enter into foreign currency forward purchase and sale contracts to mitigate our exposure to changes in exchange rates on certain intercompany and third-party trade receivables and payables. We manage counter-party credit risk by entering into derivative financial instruments with major financial institutions that can be expected to fully perform under the terms of such agreements. We do not enter into derivative financial instruments for speculative purposes. The fair value of our foreign currency forward contracts is based on an internally developed model which incorporates observable inputs including quoted spot rates, forward exchange rates and discounted future expected cash flows utilizing market interest rates with similar quality and maturity characteristics. We record the change in fair value of these foreign exchange forward contracts as part of currency gains (losses) within cost of sales in the consolidated statements of income. The fair value of foreign exchange forward contracts are recorded in prepayments and other current assets or other current liabilities in the consolidated balance sheet. The fair value of our foreign currency forward contracts was a net liability position of less than $1 million at both December 31, 2014 and 2013.
	The following table summarizes by major currency the notional amounts for foreign currency forward purchase and sale contracts as of December 31, 2014 (all of which mature in 2015):
			Notional Amount
			in Foreign Currency
			(Millions)
	Australian dollars	—Purchase	3
	British pounds	—Purchase	1
	Canadian dollars	—Sell	(2	)
	European euro	—Purchase	1
		—Sell	(4	)
	Japanese yen	—Sell	(1,268	)
	South African rand	—Purchase	112
	U.S. dollars	—Purchase	14
		—Sell	(10	)
	Guarantees — We have from time to time issued guarantees for the performance of obligations by some of our subsidiaries, and some of our subsidiaries have guaranteed our debt. All of our existing and future material domestic subsidiaries fully and unconditionally guarantee our senior credit facility and our senior notes on a joint and several basis. The senior credit facility is also secured by first-priority liens on substantially all our domestic assets and pledges of up to 66 percent of the stock of certain first-tier foreign subsidiaries. No assets or capital stock secure our senior notes. For additional information, refer to Note 13 of the consolidated financial statements of Tenneco Inc., where we present the Supplemental Guarantor Condensed Consolidating Financial Statements.
	In March 2011, we entered into two performance guarantee agreements in the U.K. between Tenneco Management (Europe) Limited (“TMEL”) and the two Walker Group Retirement Plans, the Walker Group Employee Benefit Plan and the Walker Group Executive Retirement Benefit Plan (the “Walker Plans”), whereby TMEL will guarantee the payment of all current and future pension contributions in event of a payment default by the sponsoring or participating employers of the Walker Plans. As a result of our decision to enter into these performance guarantee agreements, the levy due to the U.K. Pension Protection Fund was reduced. The Walker Plans are comprised of employees from Tenneco Walker (U.K.) Limited and our Futaba-Tenneco U.K. joint venture. Employer contributions are funded by both Tenneco Walker (U.K.) Limited, as the sponsoring employer and Futaba-Tenneco U.K., as a participating employer. The performance guarantee agreements are expected to remain in effect until all pension obligations for the Walker Plans’ sponsoring and participating employers have been satisfied. The maximum amount payable for these pension performance guarantees, related to other participating employers, is approximately $55 million as of December 31, 2014 which is determined by taking 105 percent of the liability of the Walker Plans calculated under section 179 of the U.K. Pension Act of 2004 offset by plan assets. We did not record an additional liability in March 2011 for this performance guarantee since Tenneco Walker (U.K.) Limited, as the sponsoring employer of the Walker Plans, already recognizes 100 percent of the pension obligation calculated based on U.S. GAAP, for all of the Walker Plans’ participating employers on its balance sheet, which was $17 million and $10 million at December 31, 2014 and December 31, 2013, respectively. At December 31, 2014, all pension contributions under the Walker Plans were current for all of the Walker Plans’ sponsoring and participating employers.
	In June 2011, we entered into an indemnity agreement between TMEL and Futaba Industrial Co. Ltd. which requires Futaba to indemnify TMEL for any cost, loss or liability which TMEL may incur under the performance guarantee agreements relating to the Futaba-Tenneco U.K. joint venture. The maximum amount reimbursable by Futaba to TMEL under this indemnity agreement is equal to the amount incurred by TMEL under the performance guarantee agreements multiplied by Futaba’s shareholder ownership percentage of the Futaba-Tenneco U.K. joint venture. At December 31, 2014, the maximum amount reimbursable by Futaba to TMEL is approximately $9 million.
	We have issued guarantees through letters of credit in connection with some obligations of our affiliates. As of December 31, 2014, we have guaranteed $35 million in letters of credit to support some of our subsidiaries’ insurance arrangements, foreign employee benefit programs, environmental remediation activities and cash management and capital requirements.
	Financial Instruments — One of our European subsidiaries receives payment from one of its customers whereby the accounts receivable are satisfied through the delivery of negotiable financial instruments. We may collect these financial instruments before their maturity date by either selling them at a discount or using them to satisfy accounts receivable that have previously been sold to a European bank. Any of these financial instruments which are not sold are classified as other current assets. The amount of these financial instruments that was collected before their maturity date and sold at a discount totaled $1 million and $5 million at December 31, 2014 and December 31, 2013, respectively. No such financial instruments were held by our European subsidiary as of December 31, 2014 and December 31, 2013, respectively.
	In certain instances, several of our Chinese subsidiaries receive payment from customers through the receipt of financial instruments on the date the customer payments are due. Several of our Chinese subsidiaries also satisfy vendor payments through the delivery of financial instruments on the date the payments are due. Financial instruments issued to satisfy vendor payables and not redeemed totaled $24 million and $13 million at December 31, 2014 and December 31, 2013, respectively, and were classified as notes payable. Financial instruments received from customers and not redeemed totaled $17 million and $12 million at December 31, 2014 and December 31, 2013, respectively. We classify financial instruments received from our customers as other current assets if issued by a financial institution of our customers or as customer notes and accounts if issued by our customer. We classified $17 million and $12 million in other current assets at December 31, 2014 and December 31, 2013, respectively.
	The financial instruments received by one of our European subsidiaries and some of our Chinese subsidiaries are drafts drawn that are payable at a future date and, in some cases, are negotiable and/or are guaranteed by the banks of the customers. The use of these instruments for payment follows local commercial practice. Because certain of such financial instruments are guaranteed by our customers’ banks, we believe they represent a lower financial risk than the outstanding accounts receivable that they satisfy which are not guaranteed by a bank.
	Supply Chain Financing. Near the end of the second quarter of 2013 certain of our suppliers in the U.S. extended their payment terms to Tenneco. The liquidity benefit to Tenneco from the extended payment terms totaled $16 million at December 31, 2014. These suppliers also began participating in a supply chain financing program under which they securitize their accounts receivables from Tenneco with two financial institutions. The financial institutions participate in the supply chain financing program on an uncommitted basis and can cease purchasing receivables from Tenneco's suppliers at any time. If the financial institutions did not continue to purchase receivables from Tenneco's suppliers under this program, the participating vendors could reduce their payment terms to Tenneco which in turn would cause our borrowings under our revolving credit facility to increase.
	Restricted Cash - Two of our Australian subsidiaries arranged for $3 million in guarantees to be issued by a financial institution to support some of our subsidiaries' property lease arrangements and workers compensation programs. These guarantees were supported by a cash deposit with the financial institution which has been classified as restricted cash on the Tenneco Inc. consolidated balance sheet at December 31, 2014.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Income Taxes	Income Taxes
	The domestic and foreign components of our income before income taxes and noncontrolling interests are as follows:
		Year Ended December 31,
		2014			2013			2012
		(Millions)
	U.S. income before income taxes	$	130		$	150		$	166
	Foreign income before income taxes	271			194			157
	Income before income taxes and noncontrolling interests	$	401		$	344		$	323
	Following is a comparative analysis of the components of income tax expense:
		Year Ended December 31,
		2014			2013			2012
		(Millions)
	Current —
	U.S. federal	$	38		$	25		$	—
	State and local	3			4			4
	Foreign	92			81			89
		133			110			93
	Deferred —
	U.S. federal	2			(4		)	(25		)
	State and local	7			2			(20		)
	Foreign	(11		)	14			(29		)
		(2		)	12			(74		)
	Income tax expense	$	131		$	122		$	19
	Following is a reconciliation of income taxes computed at the statutory U.S. federal income tax rate (35 percent for all years presented) to the income tax expense reflected in the statements of income:
		Year Ended December 31,
		2014			2013			2012
		(Millions)
	Income tax expense computed at the statutory U.S. federal income tax rate	$	140		$	120		$	113
	Increases (reductions) in income tax expense resulting from:
	Foreign income taxed at different rates	(21		)	(21		)	(21		)
	Taxes on repatriation of dividends	4			9			8
	Remeasurement of estimated tax on unremitted earnings	—			(17		)	—
	State and local taxes on income, net of U.S. federal income tax benefit	8			6			4
	Changes in valuation allowance for tax loss carryforwards and credits	12			27			(91		)
	Foreign tax holidays	(6		)	(5		)	(5		)
	Investment and R&D tax credits	(10		)	(8		)	(1		)
	Foreign earnings subject to U.S. federal income tax	7			5			23
	Adjustment of prior years taxes	(2		)	(1		)	(5		)
	Impact of tax law changes	—			(3		)	(1		)
	Tax contingencies	—			6			(6		)
	Other	(1		)	4			1
	Income tax expense	$	131		$	122		$	19
	The components of our net deferred tax assets were as follows:
		Year Ended December 31,
		2014			2013
		(Millions)
	Deferred tax assets —
	Tax loss carryforwards:
	U.S. federal	$	—		$	—
	State	15			23
	Foreign	75			78
	Tax credit benefits	86			88
	Postretirement benefits other than pensions	55			43
	Pensions	56			36
	Bad debts	2			1
	Sales allowances	7			6
	Payroll and other accruals	155			132
	Valuation allowance	(139		)	(135		)
	Total deferred tax assets	312			272
	Deferred tax liabilities —
	Tax over book depreciation	51			56
	Other	59			51
	Total deferred tax liabilities	110			107
	Net deferred tax assets	$	202		$	165
State tax loss carryforwards have been presented net of uncertain tax positions that if realized, would reduce tax loss carryforwards in 2014 and 2013 by $6 million and $4 million, respectively. Additionally, foreign tax loss carryforwards, have been presented net of uncertain tax positions that if realized, would reduce tax loss carryforwards in 2014 and 2013 by $12 million and $6 million, respectively.
Following is a reconciliation of deferred taxes to the deferred taxes shown in the balance sheet:
	Year Ended December 31,
	2014			2013
	(Millions)
Balance Sheet:
Current portion — deferred tax asset	$	81		$	71
Non-current portion — deferred tax asset	143			125
Current portion — deferred tax liability shown in other current liabilities	(4		)	(3		)
Non-current portion — deferred tax liability	(18		)	(28		)
Net deferred tax assets	$	202		$	165
As a result of the valuation allowances recorded for $139 million and $135 million at December 31, 2014 and 2013, respectively, we have potential tax assets that were not recognized on our balance sheet. These unrecognized tax assets resulted primarily from foreign tax loss carryforwards, foreign investment tax credits, foreign research and development credits and U.S. state net operating losses that are available to reduce future tax liabilities.
We reported income tax expense of $131 million, $122 million and $19 million in the years ended 2014, 2013 and 2012, respectively. The tax expense recorded in 2014 includes a net tax benefit of $11 million for prior year tax adjustments primarily relating to changes to uncertain tax positions and prior year income tax estimates. The tax expense recorded in 2013 differs from the expense that would be recorded using a U.S. Federal statutory rate of 35 percent primarily due to the impact of recording a valuation allowance against a tax benefit for restructuring activities in Spain and Belgium and U.S. taxes on repatriation of dividends, partially offset by tax adjustments related to recognizing a U.S. tax benefit for foreign taxes and a favorable mix of income generated in low tax rate jurisdictions. The tax expense recorded in 2012 included the impact of the U.S. 2012 valuation allowance release and income generated in lower tax rate jurisdictions, partially offset by the impact of recording a valuation allowance against the tax benefit for tax credits and losses in certain foreign jurisdictions.
In 2012, we reversed the tax valuation allowance against our net deferred tax assets in the U.S. based on operating improvements we had made, the outlook for light and commercial vehicle production in the U.S. and the positive impact this should have on our U.S. operations. We have fully utilized our federal net operating loss ("NOL") as of June 30, 2014. The state NOLs expire in various tax years through 2032.
Valuation allowances have been established in certain foreign jurisdictions for deferred tax assets based on a “more likely than not” threshold. The ability to realize deferred tax assets depends on our ability to generate sufficient taxable income within the carryforward periods provided for in the tax law for each tax jurisdiction. We have considered the following possible sources of taxable income when assessing the realization of our deferred tax assets:
•	Future reversals of existing taxable temporary differences;
•	Taxable income or loss, based on recent results, exclusive of reversing temporary differences and carryforwards;
•	Tax-planning strategies; and
•	Taxable income in prior carryback years if carryback is permitted under the relevant tax law.
In 2012, after considering all available evidence and all possible sources of taxable income, we recorded a $19 million tax valuation allowance in Spain for tax credits that may not be utilized due to tax losses in Spain.
The valuation allowances recorded against deferred tax assets generated by taxable losses in Spain and certain other foreign jurisdictions will impact our provision for income taxes until the valuation allowances are released. Our provision for income taxes will include no tax benefit for losses incurred and no tax expense with respect to income generated in these jurisdictions until the respective valuation allowance is eliminated.
We do not provide for U.S. income taxes on unremitted earnings of foreign subsidiaries, except for the earnings of certain of our China operations, as our present intention is to reinvest the unremitted earnings in our foreign operations. Unremitted earnings of foreign subsidiaries were approximately $737 million at December 31, 2014. We estimated that the amount of U.S. and foreign income taxes that would be accrued or paid upon remittance of the assets that represent those unremitted earnings was $121 million. The estimated U.S. and foreign income taxes on unremitted earnings may be impacted in the future if we are unable to claim a U.S. foreign tax credit.
We have tax sharing agreements with our former affiliates that allocate tax liabilities for periods prior to year 2000 and establish indemnity rights on certain tax issues.
U.S. GAAP provides that a tax benefit from an uncertain tax position may be recognized when it is “more likely than not” that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on the technical merits.
A reconciliation of our uncertain tax positions is as follows:
	2014			2013			2012
	(Millions)
Uncertain tax positions —
Balance January 1	$	115		$	107		$	119
Gross increases in tax positions in current period	8			15			13
Gross increases in tax positions in prior period	5			—			1
Gross decreases in tax positions in prior period	(5		)	(1		)	(12		)
Gross decreases — settlements	(2		)	—			(5		)
Gross decreases — statute of limitations expired	(7		)	(6		)	(9		)
Balance December 31	$	114		$	115		$	107
Included in the balance of uncertain tax positions were $101 million in 2014, $107 million in 2013, $101 million in 2012, of tax benefits, that if recognized, would affect the effective tax rate. We recognize accrued interest and penalties related to unrecognized tax benefits as income tax expense. Penalties of less than $1 million were accrued in 2014, 2013 and 2012. Additionally, we accrued interest income related to uncertain tax positions of less than $1 million in 2014, accrued interest expense of $2 million in 2013, and interest income of $2 million in 2012. Our liability for penalties was $2 million at December 31, 2014, $2 million at December 31, 2013 and $3 million at December 31, 2012, respectively, and our liability for interest was $6 million, $7 million, and $5 million at December 31, 2014, 2013 and 2012, respectively.
Our uncertain tax position at December 31, 2014 and 2013 included exposures relating to the disallowance of deductions, global transfer pricing and various other issues. We believe it is reasonably possible that a decrease of up to $30 million in unrecognized tax benefits related to the expiration of foreign statute of limitations and the conclusion of income tax examinations may occur within the coming year.
We are subject to taxation in the U.S. and various state and foreign jurisdictions. As of December 31, 2014, our tax years open to examination in primary jurisdictions are as follows:
	Open To Tax
	Year
United States	2000
China	2004
Spain	2003
Canada	2011
Brazil	2010
Mexico	2009
Belgium	2012
Germany	2010
United Kingdom	2012

Common_Stock

Common Stock	12 Months Ended
	Dec. 31, 2014
Common Stock	Common Stock
	We have authorized 135 million shares ($0.01 par value) of common stock, of which 64,454,248 shares and 63,714,728 shares were issued at December 31, 2014 and 2013, respectively. We held 3,244,692 and 2,844,692 shares of treasury stock at December 31, 2014 and 2013, respectively.
	Equity Plans — In December 1996, we adopted the 1996 Stock Ownership Plan, which permitted the granting of a variety of awards, including common stock, restricted stock, performance units, stock equivalent units, stock appreciation rights (“SARs”) and stock options to our directors, officers, employees and consultants. The 1996 plan, which terminated as to new awards on December 31, 2001, was renamed the “Stock Ownership Plan.” In December 1999, we adopted the Supplemental Stock Ownership Plan, which permitted the granting of a variety of similar awards to our directors, officers, employees and consultants. We were authorized to deliver up to about 1.1 million treasury shares of common stock under the Supplemental Stock Ownership Plan, which also terminated as to new awards on December 31, 2001. In March 2002, we adopted the 2002 Long-Term Incentive Plan which permitted the granting of a variety of similar awards to our officers, directors, employees and consultants. Up to 4 million shares of our common stock were authorized for delivery under the 2002 Long-Term Incentive Plan. In March 2006, we adopted the 2006 Long-Term Incentive Plan which replaced the 2002 Long-Term Incentive Plan and permits the granting of a variety of similar awards to directors, officers, employees and consultants. On May 13, 2009, our stockholders approved an amendment to the Tenneco Inc. 2006 Long-Term Incentive Plan to increase the shares of common stock available thereunder by 2.3 million. Each share underlying an award generally counts as one share against the total plan availability under the 2009 amendment, each share underlying a full value award (e.g. restricted stock), however, counts as 1.25 shares against the total plan availability. On May 15, 2013 our stockholders approved another amendment to the Tenneco Inc. 2006 Long-Term Incentive Plan to increase the shares of common stock available thereunder by 3.5 million. As part of this amendment, each share underlying a full value award subsequently issued counts as 1.49 shares against total plan availability. As of December 31, 2014, up to 3,610,571 shares of our common stock remain authorized for delivery under the 2006 Long-Term Incentive Plan. Our nonqualified stock options have seven to 20 year terms and vest equally over a three-year service period from the date of the grant.
	We have granted restricted common stock and stock options to our directors and certain key employees and restricted stock units, payable in cash, to certain key employees. These awards generally require, among other things, that the award holder remain in service to our company during the restriction period, which is currently three years, with a portion of the award vesting equally each year. We also have granted stock equivalent units and long-term performance units to certain key employees that are payable in cash. At December 31, 2014, the long-term performance units outstanding included a three-year grant for 2012-2014 payable in the first quarter of 2015, a three-year grant for 2013-2015 payable in the first quarter of 2016, and a three-year grant for 2014-2016 payable in the first quarter of 2017. Payment is based on the attainment of specified performance goals. Grant value is based on stock price, cumulative EBITDA and free cash flow metrics. In addition, we have granted SARs to certain key employees in our Asian and Indian operations that are payable in cash after a three-year service period. The grant value is indexed to the stock price.
	Accounting Methods — We have recorded compensation expense (net of taxes) of $3 million, $6 million, and $5 million in the years ended December 31, 2014, 2013 and 2012, respectively, related to nonqualified stock options as part of our selling, general and administrative expense. This resulted in a $0.06 decrease in basic and diluted earnings per share in 2014, a $0.10 decrease in basic and a $0.09 decrease in diluted earnings per share in 2013, and a $0.09 decrease in basic and a $0.08 decrease in diluted earnings per share in 2012.
	For employees eligible to retire at the grant date, we immediately expense stock options and restricted stock. If employees become eligible to retire during the vesting period, we immediately recognize any remaining expense associated with their stock options and restricted stock.
	As of December 31, 2014, there was approximately $5 million of unrecognized compensation costs related to our stock options awards that we expect to recognize over a weighted average period of 0.9 years.
	Compensation expense for restricted stock, restricted stock units, long-term performance units and SARs (net of taxes) was $13 million, $17 million, and $16 million for each of the years ended 2014, 2013 and 2012, respectively, and was recorded in selling, general, and administrative expense on the consolidated statements of income.
	Cash received from stock option exercises was $10 million in 2014, $15 million in 2013, and $7 million in 2012. Stock option exercises generated an excess tax benefit of $12 million in 2014, $6 million in 2013 and $10 million in 2012. We started to record this tax benefit in the third quarter of 2013 when we began utilizing our federal and state NOLs. We recorded a tax benefit of $26 million in 2014, of which $14 million was related to the historic tax benefit on stock options from 2011 to 2013. In 2013 we recorded a tax benefit of $24 million related to the historic tax benefit on stock options from 2006 through 2011.
	Assumptions — We calculated the fair values of stock option awards using the Black-Scholes option pricing model with the weighted average assumptions listed below. The fair value of share-based awards is determined at the time the awards are granted which is generally in January of each year, and requires judgment in estimating employee and market behavior.
		2014				2013				2012
	Stock Options Granted:
	Weighted average grant date fair value, per share	$	26.46			$	19.84			$	17.35
	Weighted average assumptions used:
	Expected volatility	52.8		%		66.4		%		73.5		%
	Expected lives	5				4.9				4.7
	Risk-free interest rates	1.7		%		0.7		%		0.8		%
	Dividends yields	—		%		—		%		—		%
	Expected volatility is calculated based on current implied volatility and historical realized volatility for the Company.
	Expected lives of options are based upon the historical and expected time to post-vesting forfeiture and exercise. We believe this method is the best estimate of the future exercise patterns currently available.
	The risk-free interest rates are based upon the Constant Maturity Rates provided by the U.S. Treasury. For our valuations, we used the continuous rate with a term equal to the expected life of the options.
	Stock Options — The following table reflects the status and activity for all options to purchase common stock for the period indicated:
		Year Ended December 31, 2014
		Shares			Weighted Avg.				Weighted Avg.		Aggregate
		Under			Exercise				Remaining		Intrinsic
		Option			Prices				Life in Years		Value
											(Millions)
	Outstanding Stock Options:
	Outstanding, January 1, 2014	1,983,573			$	22.93			4.5		$	62
	Granted	192,624			56.23
	Canceled	(31,299	)		19.78
	Forfeited	(300	)		22.77
	Exercised	(25,595	)		14.72						1
	Outstanding, March 31, 2014	2,119,003			$	26.1			4.6		$	67
	Granted	—			—
	Forfeited	—			—
	Exercised	(32,233	)		25.49						1
	Outstanding, June 30, 2014	2,086,770			$	26.11			4.3		$	75
	Granted	834			66.54
	Canceled	(526	)		36
	Forfeited	(1,535	)		29.72
	Exercised	(12,358	)		23.81						—
	Outstanding, September 30, 2014	2,073,185			$	26.13			4.1		$	77
	Granted	—			—
	Canceled	—			—
	Forfeited	(12,182	)		47.36
	Exercised	(607,000	)		13.66						24
	Outstanding, December 31, 2014	1,454,003			$	31.16			4.4		$	33
	Of the outstanding 1,454,003 options, 971,689 are currently exercisable and have an intrinsic value of $28 million, a weighted average exercise price of 25.37 and a weighted average remaining life of 4.5 years.
	The weighted average grant-date fair value of options granted during the years 2014, 2013 and 2012 was $26.48, $19.91 and $17.49, respectively. The total intrinsic value of options exercised during the years ended December 31, 2014, 2013, and 2012 was $30 million, $19 million and $10 million, respectively. The total fair value of shares vested was $6 million, $5 million, and $4 million in 2014, 2013 and 2012.
	Restricted Stock — The following table reflects the status for all nonvested restricted shares for the period indicated:
		Year Ended December 31, 2014
		Shares			Weighted Avg.
					Grant Date
					Fair Value
	Nonvested Restricted Shares
	Nonvested balance at January 1, 2014	368,268			$	34.9
	Granted	131,561			54.9
	Vested	(186,112	)		36.57
	Forfeited	—			—
	Nonvested balance at March 31, 2014	313,717			$	42.3
	Granted	2,838			66.96
	Vested	(2,286	)		31.63
	Forfeited	(575	)		38.52
Nonvested balance at June 30, 2014	313,694			$	42.6
Granted	1,160			67.02
Vested	(10,664	)		55.36
Forfeited	—			—
Nonvested balance at September 30, 2014	304,190			$	42.25
Granted	—			—
Vested	(11,040	)		36.37
Forfeited	(7,099	)		47.37
Nonvested balance at December 31, 2014	286,051			$	42.35
The fair value of restricted stock grants is equal to the average market price of our stock at the date of grant. As of December 31, 2014, approximately $5 million of total unrecognized compensation costs related to restricted stock awards is expected to be recognized over a weighted-average period of approximately 1.7 years.
The weighted average grant-date fair value of restricted stock granted during the years 2014, 2013 and 2012 was $55.26, $36.40, and $30.06, respectively. The total fair value of restricted shares vested was $8 million in 2014, $6 million in 2013 and $5 million in 2012.
Share Repurchase Program — In January 2012, our Board of Directors approved a share repurchase program, authorizing us to repurchase up to 600,000 shares of our outstanding common stock over a 12 months period. This share repurchase program was intended to offset dilution from shares of restricted stock and stock options issued in 2012 to employees. We purchased all of the 600,000 shares during the second quarter of 2012 through open market purchases, which were funded through cash from operations, at a total cost of $18 million, at an average price of $29.22 per share. These repurchased shares are held as part of our treasury stock which increased to 2,294,692 shares at December 31, 2012 from 1,694,692 shares at December 31, 2011.
In January 2013, our Board of Directors approved a share repurchase program, authorizing our company to repurchase up to 550,000 shares of our outstanding common stock over a 12 month period. This share repurchase program is intended to offset dilution from shares of restricted stock and stock options issued in 2013 to employees. We purchased 450,000 shares through open market purchases and 100,000 shares from the Tenneco Retirement Plan for Salaried Employees, both of which were funded through cash from operations, at a total cost of $27 million, at an average price of 49.33 per share. These repurchased shares are held as part of our treasury stock which increased to 2,844,692 shares at December 31, 2013 from 2,294,692 shares at December 31, 2012.
In January 2014, our Board of Directors approved a share repurchase program, authorizing our company to repurchase up to 400,000 shares of our outstanding common stock over a 12 month period. This share repurchase program is intended to offset dilution from shares of restricted stock and stock options issued in 2014 to employees. We purchased 400,000 shares through open market purchases, which were funded through cash from operations, at a total cost of $22 million, at an average price of $56.06 per share. These repurchased shares are held as part of our treasury stock which increased to 3,244,692 shares at December 31, 2014 from 2,844,692 shares at December 31, 2013.
In January 2015, our Board of Directors approved a share repurchase program, authorizing our company to repurchase up to $350 million of our outstanding common stock over a three-year period.
Long-Term Performance Units, Restricted Stock Units and SARs — Long-term performance units, restricted stock units, and SARs are paid in cash and recognized as a liability based upon their fair value. As of December 31, 2014, $14 million of total unrecognized compensation costs is expected to be recognized over a weighted-average period of approximately 1.6 years.

Preferred_Stock

Preferred Stock	12 Months Ended
	Dec. 31, 2014
Preferred Stock	Preferred Stock
	We had 50 million shares of preferred stock ($0.01 par value) authorized at December 31, 2014 and 2013, respectively. No shares of preferred stock were outstanding at those dates.

Pension_Plans_Postretirement_a

Pension Plans, Postretirement and Other Employee Benefits	12 Months Ended
	Dec. 31, 2014
Pension Plans, Postretirement and Other Employee Benefits	Pension Plans, Postretirement and Other Employee Benefits
	Pension benefits are based on years of service and, for most salaried employees, on average compensation. Our funding policy is to contribute to the plans amounts necessary to satisfy the funding requirement of applicable federal or foreign laws and regulations. Of our $931 million benefit obligation at December 31, 2014, approximately $879 million required funding under applicable federal and foreign laws. The balance of our benefit obligation, $52 million, did not require funding under applicable federal or foreign laws and regulations. At December 31, 2014, we had approximately $726 million in assets to fund that obligation. Pension plan assets were invested in the following classes of securities:
		Percentage of Fair Market Value
		31-Dec-14						31-Dec-13
		US			Foreign			US			Foreign
	Equity Securities	70	%		60	%		71	%		62	%
	Debt Securities	30	%		32	%		29	%		31	%
	Real Estate	—			4	%		—			2	%
	Other	—			4	%		—	%		5	%
	The assets of some of our pension plans are invested in trusts that permit commingling of the assets of more than one employee benefit plan for investment and administrative purposes. Each of the plans participating in the trust has interests in the net assets of the underlying investment pools of the trusts. The investments for all our pension plans are recorded at estimated fair value, in compliance with the accounting guidance on fair value measurement.
	The following table presents our plan assets using the fair value hierarchy as of December 31, 2014 and 2013, respectively. The fair value hierarchy has three levels based on the methods used to determine the fair value. Level 1 assets refer to those asset values based on quoted market prices in active markets for identical assets at the measurement date. Level 2 assets refer to assets with values determined using significant other observable inputs, and Level 3 assets include values determined with non-observable inputs.
		Fair Value Level as of December 31, 2014
		US											Foreign
	Asset Category	Level 1				Level 2				Level 3			Level 1				Level 2			Level 3
		(Millions)
	Equity securities:
	U.S. large cap	$	41			$	134			$	—		$	31			$	25		$	—
	U.S. mid cap	—				—				—			4				5			—
	U.S. Small Cap	—				25				—			—				—			—
	Non-U.S. large cap	—				—				—			57				68			—
	Non-U.S. mid cap	—				24				—			20				16			—
	Non-U.S. small cap	—				—				—			1				6			—
	Emerging markets	—				8				—			—				3			—
	Debt securities:
	U.S. corporate bonds	—				5				—			—				5			—
	U.S. other fixed income	—				95				—			—				—			—
	Non-U.S. treasuries/government bonds	—				—				—			41				27			—
	Non-U.S. corporate bonds	—				—				—			20				27			—
	Non-U.S. mortgage backed securities	—				—				—			—				2			—
	Non-U.S. municipal obligations	—				—				—			1				—			—
	Non-U.S. asset backed securities	—				—				—			—				—			—
	Non-U.S. other fixed income	—				—				—			1				—			—
	Real Estate:
	Non-U.S. real estate	—				—				—			—				6			—
	Other:
	Insurance contracts	—				—				—			—				13			9
	Cash held in bank accounts	2				—				—			4				—			—
	Total	$	43			$	291			$	—		$	180			$	203		$	9
		Fair Value Level as of December 31, 2013
		US											Foreign
	Asset Category	Level 1				Level 2				Level 3			Level 1				Level 2			Level 3
		(Millions)
	Equity securities:
	U.S. large cap	$	41			$	143			$	—		$	31			$	21		$	—
	U.S. mid cap	—				—				—			4				4			—
	U.S. Small Cap	—				27				—			—				—			—
	Non-U.S. large cap	—				—				—			57				71			—
	Non-U.S. mid cap	—				27				—			20				19			—
	Non-U.S. small cap	—				—				—			1				7			—
	Emerging markets	—				8				—			—				4			—
	Debt securities:
	U.S. corporate bonds	—				5				—			—				4			—
	U.S. other fixed income	—				96				—			—				—			—
	Non-U.S. treasuries/government bonds	—				—				—			35				25			—
	Non-U.S. corporate bonds	—				—				—			18				18			—
	Non-U.S. mortgage backed securities	—				—				—			—				4			—
	Non-U.S. municipal obligations	—				—				—			1				—			—
	Non-U.S. asset backed securities	—				—				—			—				3			—
	Non-U.S. other fixed income	—				—				—			1				2			—
	Real Estate:
	Non-U.S. real estate	—				—				—			1				5			—
	Other:
	Insurance contracts	—				—				—			—				9			8
	Cash held in bank accounts	—				—				—			6				—			—
Total	$	41			$	306			$	—		$	175			$	196		$	8
Level 1 assets were valued using market prices based on daily net asset value (NAV) or prices available daily through a public stock exchange. Level 2 assets were valued primarily using market prices, sometimes net of estimated realization expenses, and based on broker/dealer markets or in commingled funds where NAV is not available daily or publicly. For insurance contracts, the estimated surrender value of the policy was used to estimate fair market value. Level 3 assets in the Netherlands were valued using an industry standard model based on certain assumptions such as the U-return and estimated technical reserve.
The table below summarizes the changes in the fair value of the Level 3 assets:
	31-Dec-14								31-Dec-13
	Level 3 Assets								Level 3 Assets
	US				Foreign				US			Foreign
	(Millions)								(Millions)
Balance at December 31 of the previous year	$	—			$	8			$	—		$	8
Actual return on plan assets:
Relating to assets still held at the reporting date	—				1				—			—
Ending Balance at December 31	$	—			$	9			$	—		$	8
The following table contains information about significant concentrations of risk, including all individual assets that make up more than 5 percent of the total assets and any direct investments in Tenneco stock:
Asset Category	Fair Value Level			Value				Percentage of
								Total Assets
	(Millions)
2014:00:00
Tenneco Stock	1			$	41			5.6	%
2013:00:00
Tenneco Stock	1			$	41			5.6	%
Our investment policy for both our domestic and foreign plans is to invest more heavily in equity securities than debt securities. Targeted pension plan allocations are 70 percent in equity securities and 30 percent in debt securities, with acceptable tolerance levels of plus or minus five percent within each category for our domestic plans. Our foreign plans are individually managed to different target levels depending on the investing environment in each country.
Our approach to determining expected return on plan asset assumptions evaluates both historical returns as well as estimates of future returns, and adjusts for any expected changes in the long-term outlook for the equity and fixed income markets for both our domestic and foreign plans.
A summary of the change in benefit obligation, the change in plan assets, the development of net amount recognized, and the amounts recognized in the balance sheets for the pension plans and postretirement benefit plan follows:
	Pension															Postretirement
	2014								2013							2014			2013
	US				Foreign				US			Foreign				US			US
	(Millions)
Change in benefit obligation:
Benefit obligation at December 31 of the previous year	$	421			$	442			$	461		$	431			$	112		$	131
Currency rate conversion	—				(41		)		—			(2		)		—			—
Settlement	(53		)		—				—			(1		)		—			—
Curtailment	—				—							(1		)
Service cost	1				8				1			9				—			—
Interest cost	20				18				19			17				6			5
Administrative expenses/taxes paid	—				(2		)		—			(2		)		—			—
Plan amendments	—				—				—			1				—			—
Actuarial (gain)/loss	77				73				(41		)	6				18			(16		)
Prior period correction	—				—				—			—				15			—
Benefits paid	(18		)		(17		)		(19		)	(18		)		(8		)	(8		)
Participants’ contributions	—				2				—			2				—			—
Benefit obligation at December 31	$	448			$	483			$	421		$	442			$	143		$	112
Change in plan assets:
Fair value at December 31 of the previous year	$	347			$	379			$	275		$	332			$	—		$	—
Currency rate conversion	—				(32		)		—			(3		)		—			—
Settlement	(41		)		—				—			(1		)		—			—
Actual return on plan assets	23				40				60			43				—			—
Administrative expenses/taxes paid	—				(2		)		—			(2		)		—			—
Employer contributions	23				22				31			26				8			8
Prescription drug subsidy received	—				—				—			—				—			—
Participants’ contributions	—				2				—			2				—			—
Benefits paid	(18		)		(17		)		(19		)	(18		)		(8		)	(8		)
Fair value at December 31	$	334			$	392			$	347		$	379			$	—		$	—
Development of net amount recognized:
Unfunded status at December 31	$	(115	)		$	(90	)		$	(74	)	$	(62	)		$	(143	)	$	(112	)
Unrecognized cost:
Actuarial loss	230				172				190			137				53			32
Prior service cost/(credit)	1				5				1			7				(10		)	(16		)
Net amount recognized at December 31	$	116			$	87			$	117		$	82			$	(100	)	$	(96	)
Amounts recognized in the balance sheets as of December 31
Noncurrent assets	—				8				—			11				—			—
Current liabilities	(10		)		(3		)		(6		)	(2		)		(9		)	(8		)
Noncurrent liabilities	(105		)		(95		)		(68		)	(71		)		(134		)	(104		)
Net amount recognized	$	(115	)		$	(90	)		$	(74	)	$	(62	)		$	(143	)	$	(112	)
Assets of one plan may not be utilized to pay benefits of other plans. Additionally, the prepaid (accrued) pension cost has been recorded based upon certain actuarial estimates as described below. Those estimates are subject to revision in future periods given new facts or circumstances.
Net periodic pension costs for the years 2014, 2013 and 2012, consist of the following components:
	2014								2013							2012
	US				Foreign				US			Foreign				US			Foreign
	(Millions)
Service cost — benefits earned during the year	$	1			$	8			$	1		$	9			$	1		$	7
Interest cost	20				18				19			17				20			18
Expected return on plan assets	(25		)		(23		)		(22		)	(20		)		(22		)	(20		)
Curtailment loss	—				—				—			—				—			—
Settlement loss	21				—				—			1				—			1
Net amortization:
Actuarial loss	7				7				9			10				7			7
Prior service cost	—				2				—			1				—			2
Net pension costs	$	24			$	12			$	7		$	18			$	6		$	15
Amounts recognized in accumulated other comprehensive loss for pension benefits consist of the following components:
	2014								2013
	US				Foreign				US			Foreign
	(Millions)
Net actuarial loss	$	230			$	172			$	190		$	137
Prior service cost	1				5				1			7
	$	231			$	177			$	191		$	144
Amounts recognized for pension and postretirement benefits in other comprehensive income for the year ended December 31, 2014 and 2013 include the following components:
	Year Ended December 31,
	2014											2013
	Before-Tax				Tax				Net-of-Tax			Before-Tax				Tax			Net-of-Tax
	Amount				Benefit				Amount			Amount				Benefit			Amount
	(Millions)
Defined benefit pension and postretirement plans:
Change in total actuarial gain (loss)	$	(124	)		$	35			$	(89	)	$	113			$	(41	)	$	72
Amortization of prior service cost included in net periodic pension and postretirement cost	(5		)		1				(4		)	(5		)		2			(3		)
Amortization of actuarial gain (loss) included in net periodic pension and postretirement cost	18				(5		)		13			23				(7		)	16
Other comprehensive income — pension benefits	$	(111	)		$	31			$	(80	)	$	131			$	(46	)	$	85
In 2015, we expect to recognize the following amounts, which are currently reflected in accumulated other comprehensive loss, as components of net periodic benefit cost:
	2015
	US				Foreign
	(Millions)
Net actuarial loss	$	8			$	9
Prior service cost	—				1
	$	8			$	10
The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for all pension plans with accumulated benefit obligations in excess of plan assets at December 31, 2014 and 2013 were as follows:
	31-Dec-14								31-Dec-13
	US				Foreign				US			Foreign
	(Millions)
Projected benefit obligation	$	448			$	349			$	421		$	289
Accumulated benefit obligation	448				344				421			286
Fair value of plan assets	334				253				347			218
The following estimated benefit payments are payable from the pension plans to participants:
Year	US				Foreign
	(Millions)
2015	$	29			$	18
2016	21				19
2017	29				18
2018	22				19
2019	24				22
2020-2023	122				113
The following assumptions were used in the accounting for the pension plans for the years of 2014, 2013, and 2012:
	2014						2013
	US			Foreign			US			Foreign
Weighted-average assumptions used to determine benefit obligations
Discount rate	4.1	%		3.3	%		4.8	%		4.3	%
Rate of compensation increase	N/A			3.4	%		N/A			3.3	%
	2014						2013					2012
	US			Foreign			US			Foreign		US			Foreign
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate	4.8	%		4.3	%		4.1	%		4.2	%	4.8	%		4.9	%
Expected long-term return on plan assets	7.8	%		6.1	%		7.8	%		6.2	%	8.3	%		6.3	%
Rate of compensation increase	N/A			3.3	%		N/A			3.4	%	N/A			3.5	%
We made contributions of $46 million to our pension plans during 2014. Based on current actuarial estimates, we believe we will be required to make contributions of $31 million to those plans during 2015. Pension contributions beyond 2015 will be required, but those amounts will vary based upon many factors, including the performance of our pension fund investments during 2015 and future discount rate changes.
The company announced and launched a voluntary program offering to buyout former employees vested in the U.S. pension plan during the third quarter of 2014. The process was completed in the fourth quarter. Based on participant responses, more than 60% of the former employees who were eligible to participate received a buyout. This resulted in a non-cash charge of $21 million. The cash payments to those former employees who elected to take the buyout were made from the pension plan's assets and did not impact the company's cash flow. This program reduced the outstanding U.S. pension liability by approximately $50 million.
We have life insurance plans which provided benefit to a majority of our U.S. employees. We also have postretirement plans for our U.S. employees hired before January 1, 2001. The plans cover salaried employees retiring on or after attaining age 55 who have at least 10 years of service with us. For hourly employees, the postretirement benefit plans generally cover employees who retire according to one of our hourly employee retirement plans. All of these benefits may be subject to deductibles, co-payment provisions and other limitations, and we have reserved the right to change these benefits. For those employees hired after January 1, 2001, we do not provide any postretirement benefits. Our postretirement healthcare and life insurance plans are not funded. The measurement date used to determine postretirement benefit obligations is December 31.
Net periodic postretirement benefit cost for the years 2014, 2013, and 2012, consists of the following components:
	2014				2013				2012
	(Millions)
Service cost — benefits earned during the year	$	—			$	—			$	1
Interest on accumulated postretirement benefit obligation	6				5				6
Net amortization:
Actuarial loss	4				4				5
Prior service credit	(7		)		(6		)		(6		)
Prior period correction	9				$	—			$	—
Net periodic postretirement benefit cost	$	12			$	3			$	6
In the fourth quarter of 2014, we recorded an $11 million adjustment to our postretirement medical expense as a result of approximately 170 retirees who were entitled to benefits but had not been included in the prior year calculations of net periodic postretirement benefit cost.
In 2015, we expect to recognize the following amounts, which are currently reflected in accumulated other comprehensive loss, as components of net periodic benefit cost:
	2015
	(Millions)
Net actuarial loss	$	5
Prior service credit	(4		)
	$	1
The following estimated postretirement benefit payments are payable from the plan to participants:
Year	Postretirement
	Benefits
	(Millions)
2015	$	9
2016	9
2017	9
2018	9
2019	9
2020-2023	42
We do not expect to receive any future subsidies under the Medicare Prescription Drug, Improvement, and Modernization Act.
The weighted-average assumed health care cost trend rate used in determining the 2014 accumulated postretirement benefit obligation was 6.5 percent, declining to 4.5 percent by 2019. For 2013, the health care cost trend rate was 7.0 percent declining to 4.5 percent by 2019 and for 2012, the health care cost trend rate was 7.5 percent declining to 4.5 percent by 2019.
The following assumptions were used in the accounting for postretirement cost for the years of 2014, 2013 and 2012:
	2014			2013
Weighted-average assumptions used to determine benefit obligations
Discount rate	4.1	%		4.8	%
Rate of compensation increase	N/A			N/A
	2014			2013			2012
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate	4.8	%		4.1	%		4.8	%
Rate of compensation increase	N/A			N/A			N/A
A one-percentage-point increase in the 2014 assumed health care cost trend rates would increase total service and interest cost by less than $1 million and would increase the postretirement benefit obligation by $15 million. A one-percentage-point decrease in the 2014 assumed health care cost trend rates would decrease the total service and interest cost by less than $1 million and decrease the postretirement benefit obligation by $12 million.
Based on current actuarial estimates, we believe we will be required to make postretirement contributions of approximately $9 million during 2015.
Effective January 1, 2012, the Tenneco Employee Stock Ownership Plan for Hourly Employees and the Tenneco Employee Stock Ownership Plan for Salaried Employees were merged into one plan called the Tenneco 401(k) Retirement Savings Plan (the “Retirement Savings Plan”). Under the plan, subject to limitations in the Internal Revenue Code, participants may elect to defer up to 75 percent of their salary through contributions to the plan, which are invested in selected mutual funds or used to buy our common stock. We match 100 percent of an employee's contributions up to three percent of the employee's salary and 50 percent of an employee's contributions that are between three percent and five percent of the employee's salary. In connection with freezing the defined benefit pension plans for nearly all U.S. based salaried and non-union hourly employees effective December 31, 2006, and the related replacement of those defined benefit plans with defined contribution plans, we are making additional contributions to the Employee Stock Ownership Plans. We recorded expense for these contributions of approximately $25 million, $23 million and $21 million in 2014, 2013 and 2012, respectively. Matching contributions vest immediately. Defined benefit replacement contributions fully vest on the employee’s third anniversary of employment.

Segment_and_Geographic_Area_In

Segment and Geographic Area Information	12 Months Ended
	Dec. 31, 2014
Segment and Geographic Area Information	Segment and Geographic Area Information
	In connection with the organizational changes announced on February 14, 2013 that aligned our businesses along product lines, effective with 2013, our three prior geographic reportable segments have each been split into two product segments. Beginning with 2013, we are managed and organized along our two major product lines (clean air and ride performance) and three geographic areas (North America; Europe, South America and India; and Asia Pacific), resulting in six operating segments (North America Clean Air, North America Ride Performance, Europe, South America and India Clean Air, Europe, South America and India Ride Performance, Asia Pacific Clean Air and Asia Pacific Ride Performance). Within each geographical area, each operating segment manufactures and distributes either clean air or ride performance products primarily for the original equipment and aftermarket industries. Each of the six operating segments constitutes a reportable segment. Costs related to other business activities, primarily corporate headquarter functions, are disclosed separately from the six 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 revised to reflect our new reporting segments.
	Segment results for 2014, 2013 and 2012 are as follows:
		Clean Air Division									Ride Performance Division
		North			Europe, South America & India				Asia		North		Europe, South America & India			Asia		Other			Reclass & Elims			Total
		America							Pacific		America					Pacific
		(Millions)
	At December 31, 2014, and for the Year Ended
	Revenues from external customers	$	2,815		$	1,974			$	1,022	$	1,351	$	1,032		$	226	$	—		$	—		$	8,420
	Intersegment revenues	25			114				—		10		38			43		—			(230		)	—
	EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	237			59				101		143		40			36		(124		)	—			492
	Total assets	1,165			789				593		664		503			227		—			69			4,010
	At December 31, 2013, and for the Year Ended
	Revenues from external customers	2,658			1,934				852		1,255		1,046			219		—			—			7,964
	Intersegment revenues	8			111				1		10		41			32		—			(203		)	—
	EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	229			57				84		124		(7		)	22		(85		)	—			424
	Total assets	1,030			827				544		628		552			213		—			36			3,830
	At December 31, 2012, and for the Year Ended
	Revenues from external customers	$	2,506		$	1,726			$	694	$	1,213	$	1,041		$	183	$	—		$	—		$	7,363
	Intersegment revenues	6			101				1		10		53			30		—			(201		)	—
	EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	202			54				71		122		41			5		(67		)	—			428
	Total assets	1,029			725				435		593		600			202		—			24			3,608
	The following table shows information relating to our external customer revenues for each product or each group of similar products:
		Net Sales
		Year Ended December 31,
		2014			2013				2012
		(Millions)
	Emission Control Products & Systems
	Aftermarket	$	318		$	327			$	318
	Original Equipment
	OE Value-add	3,559			3,282				2,948
	OE Substrate	1,934			1,835				1,660
		5,493			5,117				4,608
		5,811			5,444				4,926
	Ride Control Products & Systems
	Aftermarket	976			953				944
	Original Equipment	1,633			1,567				1,493
		2,609			2,520				2,437
	Total Revenues	$	8,420		$	7,964			$	7,363
	The following customers accounted for 10 percent or more of our net sales in the last three years. The net sales to both customers were across segments.
	Customer	2014		2013			2012
	General Motors Company	15	%	15	%		17	%
	Ford Motor Company	13	%	14	%		15	%
	The following table shows information relating to the geographic regions in which we operate:
		Geographic Area
		United			China				Germany		Mexico		Canada			Other		Reclass &			Consolidated
		States														Foreign(a)		Elims
		(Millions)
	At December 31, 2014, and for the Year Then Ended
	Revenues from external customers(b)	$	3,348		$	1,079			$	955	$	423	$	413		$	2,202	$	—		$	8,420
	Long-lived assets(c)	473			192				113		34		52			487		—			1,351
	Total assets	1,710			683				319		156		164			1,133		(155		)	4,010
	At December 31, 2013, and for the Year Then Ended
	Revenues from external customers(b)	$	3,144		$	875			$	941	$	397	$	387		$	2,220	$	—		$	7,964
	Long-lived assets(c)	448			158				120		31		59			500		—			1,316
	Total assets	1,552			602				358		126		182			1,200		(190		)	3,830
	At December 31, 2012, and for the Year Then Ended
	Revenues from external customers(b)	$	2,975		$	661			$	817	$	374	$	389		$	2,147	$	—		$	7,363
	Long-lived assets(c)	429			139				115		31		57			490		—			1,261
	Total assets	1,521			448				344		120		168			1,187		(180		)	3,608
	(a)	Revenues from external customers and long-lived assets for individual foreign countries other than China, Germany, Mexico, and Canada are not material.
	(b)	Revenues are attributed to countries based on location of the shipper.
	(c)	Long-lived assets include all long-term assets except goodwill, intangibles and deferred tax assets.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies	Commitments and Contingencies
	Capital Commitments
	We estimate that expenditures aggregating approximately $132 million will be required after December 31, 2014 to complete facilities and projects authorized at such date, and we have made substantial commitments in connection with these facilities and projects.
	Lease Commitments
	We have long-term leases for certain facilities, equipment and other assets. The minimum lease payments under our non-cancelable operating leases with lease terms in excess of one year are $46 million in 2015, $35 million in 2016, $27 million in 2017, $21 million in 2018, and $14 million in 2019 and $18 million in subsequent years. The minimum lease payments under our non-cancelable capital leases with lease terms in excess of one year are less than $1 million in each of the next five years. Total rental expense for the year 2014, 2013 and 2012 was $64 million, $58 million and $55 million, respectively.
	Environmental Matters, Legal Proceedings and Product Warranties
	We are involved in environmental remediation matters, legal proceedings, claims, investigations and warranty obligations. These matters are typically incidental to the conduct of our business and create the potential for contingent losses. We accrue for potential contingent losses when our review of available facts indicates that it is probable a loss has been incurred and the amount of the loss is reasonably estimable. Each quarter we assess our loss contingencies based upon currently available facts, existing technology, presently enacted laws and regulations and taking into consideration the likely effects of inflation and other societal and economic factors and record adjustments to these reserves as required. As an example, we consider all available evidence including prior experience in remediation of contaminated sites, other companies’ cleanup experiences and data released by the United States Environmental Protection Agency or other organizations when we evaluate our environmental remediation contingencies. All of our loss contingency estimates are subject to revision in future periods based on actual costs or new information. With respect to our environmental liabilities, where future cash flows are fixed or reliably determinable, we have discounted those liabilities. We evaluate recoveries separately from the liability and, when they are assured, recoveries are recorded and reported separately from the associated liability in our consolidated financial statements.
	Environmental Matters
	We are subject to a variety of environmental and pollution control laws and regulations in all jurisdictions in which we operate. We expense or capitalize, as appropriate, expenditures for ongoing compliance with environmental regulations that relate to current operations. We expense costs related to an existing condition caused by past operations that do not contribute to current or future revenue generation. As of December 31, 2014, we have the obligation to remediate or contribute towards the remediation of certain sites, including one Federal Superfund site. At December 31, 2014, our aggregated estimated share of environmental remediation costs for all these sites on a discounted basis was approximately $15 million, of which $3 million is recorded in other current liabilities and $12 million is recorded in deferred credits and other liabilities in our consolidated balance sheet. For those locations where the liability was discounted, the weighted average discount rate used was 2.2 percent. The undiscounted value of the estimated remediation costs was $19 million. Our expected payments of environmental remediation costs are estimated to be approximately $3 million in 2015, $1 million each year beginning 2016 through 2019 and $12 million in aggregate thereafter.
	Based on information known to us, we have established reserves that we believe are adequate for these costs. Although we believe these estimates of remediation costs are reasonable and are based on the latest available information, the costs are estimates and are subject to revision as more information becomes available about the extent of remediation required. At some sites, we expect that other parties will contribute towards the remediation costs. In addition, certain environmental statutes provide that our liability could be joint and several, meaning that we could be required to pay in excess of our share of remediation costs. Our understanding of the financial strength of other potentially responsible parties at these sites has been considered, where appropriate, in our determination of our estimated liability. We do not believe that any potential costs associated with our current status as a potentially responsible party in the Federal Superfund site, or as a liable party at the other locations referenced herein, will be material to our consolidated financial position, results of operations, or liquidity.
	Antitrust Investigations
	On March 25, 2014, representatives of the European Commission were at Tenneco GmbH's Edenkoben, Germany administrative facility to gather information in connection with an ongoing global antitrust investigation concerning multiple automotive suppliers. On March 25, 2014, we also received a related subpoena from the U.S. Department of Justice (“DOJ”).
	On November 5, 2014, the DOJ granted us conditional leniency pursuant to an agreement we entered into under the Antitrust Division’s Corporate Leniency Policy. This agreement provides us with important benefits in exchange for our self reporting of matters to the DOJ and our continuing full cooperation with the DOJ’s resulting investigation. For example, the DOJ will not bring any criminal antitrust prosecution against us, nor seek any criminal fines or penalties, in connection with the matters we reported to the DOJ. Additionally, there are limits on our liability related to any follow on civil antitrust litigation in the U.S. The limits include single rather than treble damages, as well as relief from joint and several antitrust liability with other relevant civil antitrust action defendants. These limits are subject to our satisfying the DOJ and any court presiding over such follow on civil litigation. We cannot provide any assurance as to when such actions will be filed in the future or how they will ultimately be resolved.
	Certain other competition agencies are also investigating possible violations of antitrust laws relating to products supplied by our company. We have cooperated and continue to cooperate fully with all of these antitrust investigations, and take other actions to minimize our potential exposure.
	Antitrust law investigations and related matters often continue for several years and can result in significant penalties and liability. At this point, we cannot estimate the ultimate impact on our company from investigations into our antitrust compliance and related matters in light of the uncertainties and many variables involved, and there can be no assurance that the ultimate resolution of these matters, including any civil litigation claims, will not have a material adverse effect on our consolidated financial position, results of operations or liquidity.
	Other Legal Proceedings, Claims and Investigations
	We also from time to time are involved in legal proceedings, claims or investigations. Some of these matters involve allegations of damages against us relating to environmental liabilities (including, toxic tort, property damage and remediation), intellectual property matters (including patent, trademark and copyright infringement, and licensing disputes), personal injury claims (including injuries due to product failure, design or warning issues, and other product liability related matters), taxes, employment matters, and commercial or contractual disputes, sometimes related to acquisitions or divestitures. Additionally, some of these matters involve allegations relating to legal compliance. For example, one of our Argentine subsidiaries is currently defending against a criminal complaint alleging the failure to comply with laws requiring the proceeds of export transactions to be collected, reported and/or converted to local currency within specified time periods. As another example, in the U.S. we are subject to an audit in 11 states with respect to the payment of unclaimed property to those states, spanning a period as far back as over 30 years. While we vigorously defend ourselves against all of these legal proceedings, claims and investigations and take other actions to minimize our potential exposure, in future periods we could be subject to cash costs or charges to earnings if any of these matters are resolved on unfavorable terms. Although the ultimate outcome of any legal matter cannot be predicted with certainty, based on current information, including our assessment of the merits of the particular claim, except as described above under "Antitrust Investigations," we do not expect the legal proceedings, or claims or investigations currently pending against us will have any material adverse impact on our consolidated financial position, results of operations or liquidity.
	In addition, we are subject to lawsuits initiated by a significant number of claimants alleging health problems as a result of exposure to asbestos. In the early 2000’s we were named in nearly 20,000 complaints, most of which were filed in Mississippi state court and the vast majority of which made no allegations of exposure to asbestos from our product categories. Most of these claims have been dismissed and our current docket of active and inactive cases is less than 500 cases nationwide. A small number of claims have been asserted by railroad workers alleging exposure to asbestos products in railroad cars manufactured by The Pullman Company, one of our subsidiaries. The substantial majority of the remaining claims are related to alleged exposure to asbestos in our automotive products. Only a small percentage of the claimants allege that they were automobile mechanics and a significant number appear to involve workers in other industries or otherwise do not include sufficient information to determine whether there is any basis for a claim against us. We believe, based on scientific and other evidence, it is unlikely that mechanics were exposed to asbestos by our former products and that, in any event, they would not be at increased risk of asbestos-related disease based on their work with these products. Further, many of these cases involve numerous defendants, with the number of some cases exceeding 100 defendants from a variety of industries. Additionally, the plaintiffs either do not specify any, or specify the jurisdictional minimum, dollar amount for damages. As major asbestos manufacturers and/or users continue to go out of business or file for bankruptcy, we may experience an increased number of these claims. We vigorously defend ourselves against these claims as part of our ordinary course of business. In future periods, we could be subject to cash costs or charges to earnings if any of these matters are resolved unfavorably to us. To date, with respect to claims that have proceeded sufficiently through the judicial process, we have regularly achieved favorable resolutions. Accordingly, we presently believe that these asbestos-related claims will not have a material adverse impact on our future consolidated financial position, results of operations or liquidity.
	Warranty Matters
	We provide warranties on some of our products. The warranty terms vary but range from one year up to limited lifetime warranties on some of our premium aftermarket products. Provisions for estimated expenses related to product warranty are made at the time products are sold or when specific warranty issues are identified on OE products. These estimates are established using historical information about the nature, frequency, and average cost of warranty claims. We actively study trends of our warranty claims and take action to improve product quality and minimize warranty claims. We believe that the warranty reserve is appropriate; however, actual claims incurred could differ from the original estimates, requiring adjustments to the reserve. The reserve is included in both current and long-term liabilities on the balance sheet.
	Below is a table that shows the activity in the warranty accrual accounts:
		Year Ended
		December 31,
		2014			2013			2012
		(Millions)
	Beginning Balance	$	24		$	23		$	26
	Accruals related to product warranties	24			20			15
	Reductions for payments made	(22		)	(19		)	(18		)
	Ending Balance	$	26		$	24		$	23
	In the fourth quarter of 2011, we encountered an issue in our North America OE ride performance business involving struts supplied on one particular OE platform. As a result, we directly incurred approximately $2 million in premium freight and overtime costs in the fourth quarter of 2011 and $3 million in 2012. In the first quarter of 2013 we incurred a charge of $2 million in connection with the resolution of all existing claims pertaining to this matter. We paid the customer the $2 million in the second quarter of 2013.

Supplemental_Guarantor_Condens

Supplemental Guarantor Condensed Consolidating Financial Statements	12 Months Ended
	Dec. 31, 2014
Supplemental Guarantor Condensed Consolidating Financial Statements	Supplemental Guarantor Condensed Consolidating Financial Statement
	Basis of Presentation
	Substantially all of our existing and future material domestic 100% owned subsidiaries (which are referred to as the Guarantor Subsidiaries) fully and unconditionally guarantee our senior notes due in 2020 and 2024 on a joint and several basis. However, a subsidiary’s guarantee may be released in certain customary circumstances such as a sale of the subsidiary or all or substantially all of its assets in accordance with the indenture applicable to the notes. The Guarantor Subsidiaries are combined in the presentation below.
	These consolidating financial statements are presented on the equity method. Under this method, our investments are recorded at cost and adjusted for our ownership share of a subsidiary’s cumulative results of operations, capital contributions and distributions, and other equity changes. You should read the condensed consolidating financial information of the Guarantor Subsidiaries in connection with our condensed consolidated financial statements and related notes of which this note is an integral part.
	We revised the supplemental guarantor statements of comprehensive income and cash flows as a result of a correction to comprehensive income and to the classification of intercompany dividends in the cash flow. These revisions had no impact on any of the company’s current or previously issued consolidated financial statements. The misclassification in the supplemental cash flow statements consisted of including $59 million and $47 million of intercompany dividend payments by the nonguarantor subsidiaries in operating activities which should have instead been included in financing activities for the years ended 2013 and 2012, respectively. Other comprehensive income of $48 million was excluded in the net comprehensive income of the parent company for the year ended 2013 and $26 million of other comprehensive loss was excluded for the year ended 2012. The impact of these corrections to the applicable prior periods are reflected in the guarantor financial information herein and will be reflected in future filings.
	Distributions
	There are no significant restrictions on the ability of the Guarantor Subsidiaries to make distributions to us.
	STATEMENT OF COMPREHENSIVE INCOME (LOSS)
		For the Year Ended December 31, 2014
		Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
		Subsidiaries			Subsidiaries			(Parent			& Elims
								Company)
		(Millions)
	Revenues
	Net sales and operating revenues —
	External	$	3,727		$	4,693		$	—		$	—		$	8,420
	Affiliated companies	403			602			—			(1,005		)	—
		4,130			5,295			—			(1,005		)	8,420
	Costs and expenses
	Cost of sales (exclusive of depreciation and amortization shown below)	3,391			4,639			—			(1,005		)	7,025
	Goodwill impairment charge	—			—			—			—			—
	Engineering, research, and development	81			88			—			—			169
	Selling, general, and administrative	211			302			6			—			519
	Depreciation and amortization of other intangibles	86			122			—			—			208
		3,769			5,151			6			(1,005		)	7,921
	Other income (expense)
	Loss on sale of receivables	—			(4		)	—			—			(4		)
	Other income (expense)	26			9			—			(38		)	(3		)
		26			5			—			(38		)	(7		)
	Earnings (loss) before interest expense, income taxes, noncontrolling interests and equity in net income from affiliated companies	387			149			(6		)	(38		)	492
	Interest expense —
	External (net of interest capitalized)	(1		)	4			88			—			91
	Affiliated companies (net of interest income)	73			(75		)	2			—			—
	Earnings (loss) before income taxes, noncontrolling interests and equity in net income from affiliated companies	315			220			(96		)	(38		)	401
	Income tax expense	94			37			—			—			131
	Equity in net income (loss) from affiliated companies	129			—			322			(451		)	—
	Net income (loss)	350			183			226			(489		)	270
	Less: Net income attributable to noncontrolling interests	—			44			—			—			44
	Net income (loss) attributable to Tenneco Inc.	$	350		$	139		$	226		$	(489	)	$	226
	Comprehensive income (loss) attributable to Tenneco Inc.	$	350		$	139		$	41		$	(489	)	$	41
	STATEMENT OF COMPREHENSIVE INCOME (LOSS)
		For the Year Ended December 31, 2013
		Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
		Subsidiaries			Subsidiaries			(Parent			& Elims
								Company)
		(Millions)
	Revenues
	Net sales and operating revenues —
	External	$	3,498		$	4,466		$	—		$	—		$	7,964
	Affiliated companies	350			572			—			(922		)	—
		3,848			5,038			—			(922		)	7,964
	Costs and expenses
	Cost of sales (exclusive of depreciation and amortization shown below)	3,103			4,553			—			(922		)	6,734
	Goodwill impairment charge	—			—			—			—			—
	Engineering, research, and development	66			78			—			—			144
	Selling, general, and administrative	187			260			6			—			453
	Depreciation and amortization of other intangibles	78			127			—			—			205
		3,434			5,018			6			(922		)	7,536
	Other income (expense)
	Loss on sale of receivables	—			(4		)	—			—			(4		)
	Other income (expense)	(1		)	59			—			(58		)	—
		(1		)	55			—			(58		)	(4		)
	Earnings (loss) before interest expense, income taxes, noncontrolling interests and equity in net income from affiliated companies	413			75			(6		)	(58		)	424
	Interest expense —
External (net of interest capitalized)	(2		)	5			77			—			80
Affiliated companies (net of interest income)	70			(72		)	2			—			—
Earnings (loss) before income taxes, noncontrolling interests and equity in net income from affiliated companies	345			142			(85		)	(58		)	344
Income tax expense	60			62			—			—			122
Equity in net income (loss) from affiliated companies	32			—			268			(300		)	—
Net income (loss)	317			80			183			(358		)	222
Less: Net income attributable to noncontrolling interests	—			39			—			—			39
Net income (loss) attributable to Tenneco Inc.	$	317		$	41		$	183		$	(358	)	$	183
Comprehensive income (loss) attributable to Tenneco Inc.	$	317		$	41		$	231		$	358		$	231
STATEMENT OF COMPREHENSIVE INCOME (LOSS)
	For the Year Ended December 31, 2012
	Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
	Subsidiaries			Subsidiaries			(Parent			& Elims
							Company)
	(Millions)
Revenues
Net sales and operating revenues —
External	$	3,331		$	4,032		$	—		$	—		$	7,363
Affiliated companies	182			547			—			(729		)	—
	3,513			4,579			—			(729		)	7,363
Costs and expenses
Cost of sales (exclusive of depreciation and amortization shown below)	3,056			3,843			—			(729		)	6,170
Goodwill impairment charge	—			—			—			—			—
Engineering, research, and development	57			69			—			—			126
Selling, general, and administrative	198			224			5			—			427
Depreciation and amortization of other intangibles	72			133			—			—			205
	3,383			4,269			5			(729		)	6,928
Other income (expense)
Loss on sale of receivables	—			(4		)	—			—			(4		)
Other income (expense)	115			(71		)	—			(47		)	(3		)
	115			(75		)	—			(47		)	(7		)
Earnings (loss) before interest expense, income taxes, noncontrolling interests, and equity in net income from affiliated companies	245			235			(5		)	(47		)	428
Interest expense —
External (net of interest capitalized)	—			5			100			—			105
Affiliated companies (net of interest income)	212			(81		)	(131		)	—			—
Earnings (loss) before income taxes, noncontrolling interests, and equity in net income from affiliated companies	33			311			26			(47		)	323
Income tax expense	(39		)	58			—			—			19
Equity in net income (loss) from affiliated companies	217			—			249			(466		)	—
Net income (loss)	289			253			275			(513		)	304
Less: Net income attributable to noncontrolling interests	—			29			—			—			29
Net income (loss) attributable to Tenneco Inc.	$	289		$	224		$	275		$	(513	)	$	275
Comprehensive income (loss) attributable to Tenneco Inc.	$	289		$	224		$	249		$	(513	)	$	249
BALANCE SHEET
	31-Dec-14
	Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
	Subsidiaries			Subsidiaries			(Parent			& Elims
							Company)
	(Millions)
ASSETS
Current assets:
Cash and cash equivalents	$	10		$	272		$	—		$	—		$	282
Restricted cash	—			3			—			—			3
Receivables, net	408			1,309			—			(629		)	1,088
Inventories	312			376			—			—			688
Deferred income taxes	49			25			7			—			81
Prepayments and other	96			188			—			—			284
Total current assets	875			2,173			7			(629		)	2,426
Other assets:
Investment in affiliated companies	1,064			—			764			(1,828		)	—
Notes and advances receivable from affiliates	944			10,589			4,844			(16,377		)	—
Long-term receivables, net	12			—			—			—			12
Goodwill	22			43			—			—			65
Intangibles, net	10			16			—			—			26
Deferred income taxes	76			14			53			—			143
Other	40			53			27			—			120
	2,168			10,715			5,688			(18,205		)	366
Plant, property, and equipment, at cost	1,236			2,254			—			—			3,490
Less — Accumulated depreciation and amortization	(845		)	(1,427		)	—			—			(2,272		)
	391			827			—			—			1,218
Total assets	$	3,434		$	13,715		$	5,695		$	(18,834	)	$	4,010
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Short-term debt (including current maturities of long-term debt)
Short-term debt — non-affiliated	$	—		$	54		$	6		$	—		$	60
Short-term debt — affiliated	243			220			9			(472		)	—
Accounts payable	478			1,000			—			(106		)	1,372
Accrued taxes	(15		)	31			24			—			40
Other	134			241			3			(51		)	327
Total current liabilities	840			1,546			42			(629		)	1,799
Long-term debt — non-affiliated	—			44			1,025			—			1,069
Long-term debt — affiliated	1,730			10,516			4,131			(16,377		)	—
Deferred income taxes	—			18			—			—			18
Postretirement benefits and other liabilities	418			129			—			4			551
Commitments and contingencies
Total liabilities	2,988			12,253			5,198			(17,002		)	3,437
Redeemable noncontrolling interests	—			35			—			—			35
Tenneco Inc. Shareholders’ equity	446			1,386			497			(1,832		)	497
Noncontrolling interests	—			41			—			—			41
Total equity	446			1,427			497			(1,832		)	538
Total liabilities, redeemable noncontrolling interests and equity	$	3,434		$	13,715		$	5,695		$	(18,834	)	$	4,010
BALANCE SHEET
	31-Dec-13
	Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
	Subsidiaries			Subsidiaries			(Parent			& Elims
							Company)
	(Millions)
ASSETS
Current assets:
Cash and cash equivalents	$	6		$	269		$	—		$	—		$	275
Restricted cash	—			5			—			—			5
Receivables, net	387			1,306			16			(649		)	1,060
Inventories	279			377			—			—			656
Deferred income taxes	87			—			7			(23		)	71
Prepayments and other	35			188			—			—			223
Total current assets	794			2,145			23			(672		)	2,290
Other assets:
Investment in affiliated companies	944			—			696			(1,640		)	—
Notes and advances receivable from affiliates	1,026			7,320			4,826			(13,172		)	—
Long-term receivables, net	12			2			—			—			14
Goodwill	22			47			—			—			69
Intangibles, net	13			17			—			—			30
Deferred income taxes	72			9			44			—			125
Other	44			60			23			—			127
	2,133			7,455			5,589			(14,812		)	365
Plant, property, and equipment, at cost	1,173			2,325			—			—			3,498
Less — Accumulated depreciation and amortization	(807		)	(1,516		)	—			—			(2,323		)
	366			809			—			—			1,175
Total assets	$	3,293		$	10,409		$	5,612		$	(15,484	)	$	3,830
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Short-term debt (including current maturities of long-term debt)
Short-term debt — non-affiliated	$	—		$	68		$	15		$	—		$	83
Short-term debt — affiliated	247			176			10			(433		)	—
Accounts payable	521			1,011			—			(173		)	1,359
Accrued taxes	9			31			—			—			40
Other	128			285			9			(66		)	356
Total current liabilities	905			1,571			34			(672		)	1,838
Long-term debt — non-affiliated	—			8			1,011			—			1,019
Long-term debt — affiliated	1,700			7,338			4,134			(13,172		)	—
Deferred income taxes	—			28			—			—			28
Postretirement benefits and other liabilities	357			92			—			4			453
Commitments and contingencies
Total liabilities	2,962			9,037			5,179			(13,840		)	3,338
Redeemable noncontrolling interests	—			20			—			—			20
Tenneco Inc. Shareholders’ equity	331			1,313			433			(1,644		)	433
Noncontrolling interests	—			39			—			—			39
Total equity	331			1,352			433			(1,644		)	472
Total liabilities, redeemable noncontrolling interests and equity	$	3,293		$	10,409		$	5,612		$	(15,484	)	$	3,830
STATEMENT OF CASH FLOWS
	Year Ended December 31, 2014
	Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
	Subsidiaries			Subsidiaries			(Parent			& Elims
							Company)
	(Millions)
Operating Activities
Net cash provided (used) by operating activities	$	44		$	314		$	21		$	(38	)	$	341
Investing Activities
Proceeds from sale of assets	—			3			—			—			3
Cash payments for plant, property, and equipment	(106		)	(222		)	—			—			(328		)
Cash payments for software related intangible assets	(5		)	(8		)	—			—			(13		)
Cash payments for net assets purchased	(3		)	—			—			—			(3		)
Changes in restricted cash	—			2			—			—			2
Net cash used by investing activities	(114		)	(225		)	—			—			(339		)
Financing Activities
Retirement of long-term debt	—			(9		)	(453		)	—			(462		)
Issuance of long-term debt	—			45			525			—			570
Debt issuance cost on long-term debt	—			—			(12		)	—			(12		)
Tax benefit from stock-based compensation	—			—			26			—			26
Purchase of common stock under the share repurchase program	—			—			(22		)	—			(22		)
Issuance of common stock	—			—			19			—			19
Increase in bank overdrafts	—			6			—			—			6
Net increase in revolver borrowings and short-term debt excluding current maturities of long-term debt and short-term borrowings secured by accounts receivable	—			(13		)	(57		)	—			(70		)
Net increase (decrease) in short-term borrowings secured by accounts receivable	—			—			(10		)	—			(10		)
Intercompany dividends and net increase (decrease) in intercompany obligations	74			(75		)	(37		)	38			—
Capital contribution from noncontrolling interest partner	—			5			—			—			5
Distribution to noncontrolling interests partners	—			(30		)	—			—			(30		)
Net cash provided (used) by financing activities	74			(71		)	(21		)	38			20
Effect of foreign exchange rate changes on cash and cash equivalents	—			(15		)	—			—			(15		)
Increase in cash and cash equivalents	4			3			—			—			7
Cash and cash equivalents, January 1	6			269			—			—			275
Cash and cash equivalents, December 31 (Note)	$	10		$	272		$	—		$	—		$	282
Note:	Cash and cash equivalents include highly liquid investments with a maturity of three months or less at the date of purchase.
STATEMENT OF CASH FLOWS
	Year Ended December 31, 2013
	Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
	Subsidiaries			Subsidiaries			(Parent			& Elims
							Company)
	(Millions)
Operating Activities
Net cash provided (used) by operating activities	$	270		$	244		$	48		$	(59	)	$	503
Investing Activities
Proceeds from sale of assets	1			7			—			—			8
Cash payments for plant, property, and equipment	(102		)	(142		)	—			—			(244		)
Cash payments for software related intangible assets	(19		)	(6		)	—			—			(25		)
Change in restricted cash	—			(5		)	—			—			(5		)
Net cash used by investing activities	(120		)	(146		)	—			—			(266		)
Financing Activities
Retirement of long-term debt	—			(2		)	(14		)	—			(16		)
Tax benefit from stock-based compensation	—			—			24			—			24
Purchase of common stock under the share repurchase program	—			—			(27		)	—			(27		)
Issuance of common stock	—			—			20			—			20
Increase in bank overdrafts	—			(6		)	—			—			(6		)
Net increase in revolver borrowings and short-term debt excluding current maturities of long-term debt and short-term borrowings secured by accounts receivable	—			(43		)	21			—			(22		)
Net increase in short-term borrowings secured by accounts receivable	—			—			(40		)	—			(40		)
Intercompany dividends and net increase (decrease) in intercompany obligations	(148		)	121			(32		)	59			—
Purchase of noncontrolling equity interest	—			(69		)	—			—			(69		)
Distribution to noncontrolling interests partners	—			(39		)	—			—			(39		)
Net cash provided (used) by financing activities	(148		)	(38		)	(48		)	59			(175		)
Effect of foreign exchange rate changes on cash and cash equivalents	—			(10		)	—			—			(10		)
Increase in cash and cash equivalents	2			50			—			—			52
Cash and cash equivalents, January 1	4			219			—			—			223
Cash and cash equivalents, December 31 (Note)	$	6		$	269		$	—		$	—		$	275
Note:	Cash and cash equivalents include highly liquid investments with a maturity of three months or less at the date of purchase.
STATEMENT OF CASH FLOWS
	Year Ended December 31, 2012
	Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
	Subsidiaries			Subsidiaries			(Parent			& Elims
							Company)
	(Millions)
Operating Activities
Net cash provided (used) by operating activities	$	385		$	253		$	(226	)	$	(47	)	$	365
Investing Activities
Proceeds from sale of assets	—			3			—			—			3
Cash payments for plant, property, and equipment	(101		)	(155		)	—			—			(256		)
Cash payments for software related intangible assets	(6		)	(7		)	—			—			(13		)
Cash payments for net assets purchased	(7		)	—			—			—			(7		)
Net cash used by investing activities	(114		)	(159		)	—			—			(273		)
Financing Activities
Retirement of long-term debt	—			(1		)	(410		)	—			(411		)
Issuance of long-term debt	—			—			250			—			250
Debt issuance cost on long-term debt	—			—			(13		)	—			(13		)
Purchase of common stock under the share repurchase program	—			—			(18		)	—			(18		)
Issuance of common stock	—			—			5			—			5
Increase in bank overdrafts	—			5			—			—			5
Net decrease in revolver borrowings and short-term debt excluding current maturities of long-term debt	—			48			19			—			67
Net increase in short-term borrowings secured by accounts receivable	—			—			50			—			50
Intercompany dividends and net increase (decrease) in intercompany obligations	(268		)	(122		)	343			47			—
Capital contribution from noncontrolling interest partner	—			5			—			—			5
Purchase of noncontrolling equity interest	—			—			—			—			—
Distribution to noncontrolling interests partners	—			(29		)	—			—			(29		)
Net cash provided (used) by financing activities	(268		)	(94		)	226			47			(89		)
Effect of foreign exchange rate changes on cash and cash equivalents	—			6			—			—			6
Increase (decrease) in cash and cash equivalents	3			6			—			—			9
Cash and cash equivalents, January 1	1			213			—			—			214
Cash and cash equivalents, December 31 (Note)	$	4		$	219		$	—		$	—		$	223
Note:	Cash and cash equivalents include highly liquid investments with a maturity of three months or less at the date of purchase.

Quarterly_Financial_Data_Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited)
	Quarter	Net Sales		Cost of Sales		Earnings Before		Net Income
		and		(Excluding		Interest Expense,		Attributable
		Operating		Depreciation and		Income Taxes		to Tenneco
		Revenues		Amortization)		and Noncontrolling		Inc.
						Interests
		(Millions)
	2014
	1st	$	2,094	$	1,754	$	113	$	46
	2nd	2,241		1,851		156		81
	3rd	2,081		1,735		140		78
	4th	2,004		1,685		83		21
		$	8,420	$	7,025	$	492	$	226
	2013
	1st	$	1,903	$	1,604	$	93	$	54
	2nd	2,067		1,736		141		63
	3rd	1,963		1,691		72		12
	4th	2,031		1,703		118		54
		$	7,964	$	6,734	$	424	$	183
	Quarter	Basic		Diluted
		Earnings		Earnings
		per Share of		per Share of
		Common Stock		Common Stock
	2014
	1st	$	0.76	$	0.75
	2nd	1.34		1.32
	3rd	1.29		1.27
	4th	0.34		0.33
	Full Year	3.72		3.66
	2013
	1st	$	0.9	$	0.88
	2nd	1.04		1.02
	3rd	0.19		0.19
	4th	0.9		0.88
	Full Year	3.03		2.97
	Note:	The sum of the quarters may not equal the total of the respective year’s earnings per share on either a basic or diluted basis due to changes in the weighted average shares outstanding throughout the year.
	(The preceding notes are an integral part of the foregoing consolidated financial statements.)

VALUATION_AND_QUALIFYING_ACCOU

VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 31, 2014
VALUATION AND QUALIFYING ACCOUNTS	SCHEDULE II
	TENNECO INC. AND CONSOLIDATED SUBSIDIARIES
	SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
	Column A	Column B		Column C		Column D	Column E
				Additions
	Description	Balance		Charged	Charged	Deductions	Balance
		at		to	to		at End of
		Beginning		Costs and	Other		Year
		of Year		Expenses	Accounts
		(Millions)
	Allowance for Doubtful Accounts and Notes Receivable Deducted from Assets to Which it Applies:
	Year Ended December 31, 2014	$	14	4	—	2	$	16
	Year Ended December 31, 2013	$	14	1	—	1	$	14
	Year Ended December 31, 2012	$	17	3	—	6	$	14

Summary_of_Accounting_Policies1

Summary of Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Consolidation and Presentation	Consolidation and Presentation
	Our consolidated financial statements include all majority-owned subsidiaries. We carry investments in 20 percent to 50 percent owned companies in which the Company does not have a controlling interest, as equity method investments, at cost plus equity in undistributed earnings since the date of acquisition and cumulative translation adjustments. We have eliminated intercompany transactions. We have evaluated all subsequent events through the date our financial statements were issued.
Use of Estimates	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates include, among others allowances for doubtful receivables, promotional and product returns, pension and postretirement benefit plans, income taxes, and contingencies.
Redeemable Noncontrolling Interests	Redeemable Noncontrolling Interests
	We have noncontrolling interests in five joint ventures with redemption features that could require us to purchase the noncontrolling interests at fair value in the event of a change in control of Tenneco Inc. or certain of our subsidiaries. We do not believe that it is probable that the redemption features in any of these joint venture agreements will be triggered. However, the redemption of these shares is not solely within our control. Accordingly, the related noncontrolling interests are presented as “Redeemable noncontrolling interests” in the temporary equity section of our consolidated balance sheets.
Inventories	Our inventories are stated at the lower of cost or market value using the first-in, first-out (“FIFO”) or average cost methods.
Goodwill and Intangibles, net	Goodwill and Intangibles, net
	We evaluate goodwill for impairment in the fourth quarter of each year, or more frequently if events indicate it is warranted. The goodwill impairment test consists of a two-step process. In step one, we compare the estimated fair value of our reporting units with goodwill to the carrying value of the unit’s assets and liabilities to determine if impairment exists within the recorded balance of goodwill. We estimate the fair value of each reporting unit using the income approach which is based on the present value of estimated future cash flows. The income approach is dependent on a number of factors, including estimates of market trends, forecasted revenues and expenses, capital expenditures, weighted average cost of capital and other variables. A separate discount rate derived by a combination of published sources, internal estimates and weighted based on our debt to equity ratio, was used to calculate the discounted cash flows for each of our reporting units. These estimates are based on assumptions that we believe to be reasonable, but which are inherently uncertain and outside of the control of management. If the carrying value of the reporting unit is higher than its fair value, there is an indication that impairment may exist which requires step two to be performed to measure the amount of the impairment loss. The amount of impairment is determined by comparing the implied fair value of a reporting unit’s goodwill to its carrying value.
Plant, Property, and Equipment, at Cost	We depreciate these properties excluding land on a straight-line basis over the estimated useful lives of the assets. Useful lives range from 10 to 50 years for buildings and improvements and from 3 to 25 years for machinery and equipment.
Notes and Accounts Receivable and Allowance for Doubtful Accounts	Notes and Accounts Receivable and Allowance for Doubtful Accounts
	Receivables consist of amounts billed and currently due from customers and unbilled pre-production design and development costs.
Pre-production Design and Development and Tooling Assets	Pre-production Design and Development and Tooling Assets
	We expense pre-production design and development costs as incurred unless we have a contractual guarantee for reimbursement from the original equipment customer.
Internal Use Software Assets	Internal Use Software Assets
	We capitalize certain costs related to the purchase and development of software that we use in our business operations. We amortize the costs attributable to these software systems over their estimated useful lives, ranging from 3 to 12 years, based on various factors such as the effects of obsolescence, technology, and other economic factors.
Income Taxes	Income Taxes
	We recognize deferred tax assets and liabilities on the basis of the future tax consequences attributable to temporary differences that exist between the financial statement carrying value of assets and liabilities and their respective tax values, and net operating losses ("NOL") and tax credit carryforwards on a taxing jurisdiction basis. We measure deferred tax assets and liabilities using enacted tax rates that will apply in the years in which we expect the temporary differences to be recovered or paid.
	We evaluate our deferred income taxes quarterly to determine if valuation allowances are required or should be adjusted. U.S. GAAP requires that companies assess whether valuation allowances should be established against their deferred tax assets based on consideration of all available evidence, both positive and negative, using a “more likely than not” standard. This assessment considers, among other matters, the nature, frequency and amount of recent losses, the duration of statutory carryforward periods, and tax planning strategies. In making such judgments, significant weight is given to evidence that can be objectively verified.
	Valuation allowances have been established in certain foreign jurisdictions for deferred tax assets based on a “more likely than not” threshold. The ability to realize deferred tax assets depends on our ability to generate sufficient taxable income within the carryforward periods provided for in the tax law for each tax jurisdiction. We have considered the following possible sources of taxable income when assessing the realization of our deferred tax assets:
	•	Future reversals of existing taxable temporary differences;
	•	Taxable income or loss, based on recent results, exclusive of reversing temporary differences and carryforwards;
	•	Tax-planning strategies; and
	•	Taxable income in prior carryback years if carryback is permitted under the relevant tax law.
	The valuation allowances recorded against deferred tax assets generated by taxable losses in foreign jurisdictions will impact our provision for income taxes until the valuation allowances are released. Our provision for income taxes will include no tax benefit for losses incurred and no tax expense with respect to income generated in these jurisdictions until the respective valuation allowance is eliminated.
Revenue Recognition	Revenue Recognition
	We recognize revenue for sales to our original equipment and aftermarket customers when title and risk of loss passes to the customers under the terms of our arrangements with those customers, which is usually at the time of shipment from our plants or distribution centers. Generally, in connection with the sale of exhaust systems to certain original equipment manufacturers, we purchase catalytic converters and diesel particulate filters or components thereof including precious metals (“substrates”) on behalf of our customers which are used in the assembled system. These substrates are included in our inventory and “passed through” to the customer at our cost, plus a small margin, since we take title to the inventory and are responsible for both the delivery and quality of the finished product. Revenues recognized for substrate sales were $1,934 million, $1,835 million and $1,660 million in 2014, 2013 and 2012, respectively. For our aftermarket customers, we provide for promotional incentives and returns at the time of sale. Estimates are based upon the terms of the incentives and historical experience with returns. Certain taxes assessed by governmental authorities on revenue producing transactions, such as value added taxes, are excluded from revenue and recorded on a net basis. Shipping and handling costs billed to customers are included in revenues and the related costs are included in cost of sales in our consolidated statements of income (loss).
Warranty Reserves	Warranty Reserves
	Where we have offered product warranty, we also provide for warranty costs. Provisions for estimated expenses related to product warranty are made at the time products are sold or when specific warranty issues are identified on OE products. These estimates are established using historical information about the nature, frequency, and average cost of warranty claims and upon specific warranty issues as they arise. The warranty terms vary but range from one year up to limited lifetime warranties on some of our premium aftermarket products. We actively study trends of our warranty claims and take action to improve product quality and minimize warranty claims. While we have not experienced any material differences between these estimates and our actual costs, it is reasonably possible that future warranty issues could arise that could have a significant impact on our consolidated financial statements.
Earnings Per Share	Earnings Per Share
	We compute basic earnings per share by dividing income available to common shareholders by the weighted-average number of common shares outstanding. The computation of diluted earnings per share is similar to the computation of basic earnings per share, except that we adjust the weighted-average number of shares outstanding to include estimates of additional shares that would be issued if potentially dilutive common shares had been issued. In addition, we adjust income available to common shareholders to include any changes in income or loss that would result from the assumed issuance of the dilutive common shares.
Engineering, Research and Development	Engineering, Research and Development
	We expense engineering, research, and development costs as they are incurred. Engineering, research, and development expenses were $169 million for 2014, $144 million for 2013, and $126 million for 2012, net of reimbursements from our customers. Our customers reimburse us for engineering, research, and development costs on some platforms when we prepare prototypes and incur costs before platform awards.
Advertising and Promotion Expenses	Advertising and Promotion Expenses
	We expense advertising and promotion expenses as they are incurred.
Foreign Currency Translation	Foreign Currency Translation
	We translate the consolidated financial statements of foreign subsidiaries into U.S. dollars using the exchange rate at each balance sheet date for assets and liabilities and a weighted-average exchange rate for revenues and expenses in each period. We record translation adjustments for those subsidiaries whose local currency is their functional currency as a component of accumulated other comprehensive income (loss) in shareholders’ equity. We recognize transaction gains and losses arising from fluctuations in currency exchange rates on transactions denominated in currencies other than the functional currency in earnings as incurred, except for those transactions which hedge purchase commitments and for those intercompany balances which are designated as long-term investments.
Risk Management Activities	Risk Management Activities
	We use derivative financial instruments, principally foreign currency forward purchase and sales contracts with terms of less than one year, to hedge our exposure to changes in foreign currency exchange rates. Our primary exposure to changes in foreign currency rates results from intercompany loans made between affiliates to minimize the need for borrowings from third parties. Additionally, we enter into foreign currency forward purchase and sale contracts to mitigate our exposure to changes in exchange rates on certain intercompany and third-party trade receivables and payables. We manage counter-party credit risk by entering into derivative financial instruments with major financial institutions that can be expected to fully perform under the terms of such agreements. We do not enter into derivative financial instruments for speculative purposes. In managing our foreign currency exposures, we identify and aggregate existing offsetting positions and then hedge residual exposures through third-party derivative contracts. The fair value of our foreign currency forward contracts was a net liability position of less than $1 million at both December 31, 2014 and 2013 and is based on an internally developed model which incorporates observable inputs including quoted spot rates, forward exchange rates and discounted future expected cash flows utilizing market interest rates with similar quality and maturity characteristics. We record the change in fair value of these foreign exchange forward contracts as part of currency gains (losses) within cost of sales in the consolidated statements of income (loss). The fair value of foreign exchange forward contracts are recorded in prepayments and other current assets or other current liabilities in the consolidated balance sheet.
New Accounting Pronouncements	New Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued an amendment on revenue recognition. The amendment in this update creates Topic 606, Revenue from Contracts with Customers, and supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, including most industry-specific revenue recognition guidance throughout the Industry Topics of the Codification. In addition, the amendment supersedes the cost guidance in Subtopic 605-35, Revenue Recognition-Construction-Type and Production-Type Contracts, and creates new Subtopic 340-40, Other Assets and Deferred Costs-Contracts with Customers. The core principle of Topic 606 is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendment is effective for reporting periods beginning after December 15, 2016 for public entities. We will adopt this amendment on January1, 2017. We are currently evaluating the potential impact of this new guidance on our consolidated financial statements.
Restricted Net Assets	Restricted Net Assets
	In certain countries where we operate, transfers of funds out of such countries by way of dividends, loans or advances are subject to certain central bank restrictions which require approval from the central bank authorities prior to transferring funds out of these countries. The countries in which we operate that have such restrictions include Argentina, China, South Africa, and Thailand.

Summary_of_Accounting_Policies2

Summary of Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Redeemable Noncontrolling Interests	The following is a rollforward of activity in our redeemable noncontrolling interests for the years ending December 31, 2014, 2013 and 2012, respectively:
		2014			2013			2012
		(Millions)
	Balance January 1	$	20		$	15		$	12
	Net income attributable to redeemable noncontrolling interests	23			14			9
	Sale of 45 percent equity interest from Tenneco Inc	4			—			—
	Capital Contributions	1			—			2
	Dividends declared	(13		)	(9		)	(8		)
	Balance December 31	$	35		$	20		$	15
Inventories by Major Classification	Inventories
	At December 31, 2014 and 2013, inventory by major classification was as follows:
		2014			2013
		(Millions)
	Finished goods	$	272		$	267
	Work in process	221			202
	Raw materials	137			130
	Materials and supplies	58			57
		$	688		$	656
Changes in Net Carrying Amount of Goodwill	The changes in the net carrying amount of goodwill for the years ended December 31, 2014, 2013 and 2012 were as follows:
		Clean Air Division									Ride Performance Division
		North			Europe, South America & India			Asia			North			Europe, South America & India			Asia		Total
		America						Pacific			America						Pacific
	(Millions)
	Balance at December 31, 2012	$	14		$	14		$	—		$	10		$	34		$	—	$	72
	Translation Adjustment	—			—			—			—			(3		)	—		(3		)
	Balance at December 31, 2013	14			14			—			10			31			—		69
	Translation Adjustment	—			(2		)	—			—			(2		)	—		(4		)
	Balance at December 31, 2014	14			12			—			10			29			—		65
Carrying Amount and Accumulated Amortization of Finite Useful Life Intangible Assets	The carrying amount and accumulated amortization of our finite useful life intangible assets were as follows:
		31-Dec-14						31-Dec-13
		Gross Carrying			Accumulated			Gross Carrying			Accumulated
		Value			Amortization			Value			Amortization
		(Millions)						(Millions)
	Customer contract	$	8		$	(4	)	$	8		$	(4	)
	Patents	3			(2		)	3			(2		)
	Technology rights	26			(15		)	26			(12		)
	Other	11			(2		)	11			(1		)
	Total	$	48		$	(23	)	$	48		$	(19	)
Property, Plant and Equipment	At December 31, 2014 and 2013, plant, property, and equipment, at cost, by major category were as follows:
		2014			2013
		(Millions)
	Land, buildings, and improvements	$	569		$	579
	Machinery and equipment	2,655			2,673
	Other, including construction in progress	266			246
		$	3,490		$	3,498

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Summary of Earnings Per Share of Common Stock	Earnings per share of common stock outstanding were computed as follows:
		Year Ended December 31,
		2014		2013		2012
		(Millions Except Share and Per Share Amounts)
	Basic earnings per share —
	Net income attributable to Tenneco Inc.	$	226	$	183	$	275
	Average shares of common stock outstanding	60,734,022		60,474,492		59,985,677
	Earnings per average share of common stock	$	3.72	$	3.03	$	4.58
	Diluted earnings per share —
	Net income attributable to Tenneco Inc.	$	226	$	183	$	275
	Average shares of common stock outstanding	60,734,022		60,474,492		59,985,677
	Effect of dilutive securities:
	Restricted stock	130,732		205,020		140,609
	Stock options	917,754		914,550		957,224
	Average shares of common stock outstanding including dilutive securities	61,782,508		61,594,062		61,083,510
	Earnings per average share of common stock	$	3.66	$	2.97	$	4.5

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Transfers to Noncontrolling Interest	The table below summaries the net income attributable to Tenneco Inc. and transfers to the noncontrolling interest:
		Year Ended December 31,
		2014		2013			2012
		(Millions)
	Net income attributable to Tenneco Inc.	$	226	$	183		$	275
	Decrease in equity for purchase of noncontrolling equity interest	—		(68		)	—
	Net income attributable to Tenneco Inc. shareholders less purchase of noncontrolling equity interest	226		115			275

Restructuring_and_Other_Charge1

Restructuring and Other Charges (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Roll Forward of Restructuring Reserve	Amounts related to activities that are part of our restructuring plans are as follows:
		December 31,		2014	2014		Impact of Exchange Rates		December 31,
		2013		Expenses	Cash				2014
		Restructuring			Payments				Restructuring
		Reserve							Reserve
		(Millions)
	Employee Severance, Termination Benefits and Other Related Costs	$	44	44	(43	)	(5	)	$	40

LongTerm_Debt_ShortTerm_Debt_a1

Long-Term Debt, Short-Term Debt, and Financing Arrangements (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Summary of Long-term Debt Obligations	Long-Term Debt
	A summary of our long-term debt obligations at December 31, 2014 and 2013, is set forth in the following table:
		2014				2013
		(Millions)
	Tenneco Inc. —
	Revolver borrowings due 2017, average effective interest rate 2.7% in 2013	$	—			$	58
	Revolver borrowings due 2019, average effective interest rate 2.6% in 2014	—				—
	Senior Tranche A Term Loan due 2014 through 2017, average effective interest rate 2.7% in 2013	—				228
	Senior Tranche A Term Loan due 2015 through 2019, average effective interest rate 1.9% in 2014	300				—
	7 3/4% Senior Notes due 2018	—				225
	5 3/8% Senior Notes due 2024	225				—
	6 7/8% Senior Notes due 2020	500				500
	Debentures due 2015 through 2026, average effective interest rate 7.5% in 2014 and 7.5% in 2013	1				1
	Other subsidiaries —
	Other Long Term Debt due in 2019, average interest rate 5.45% in 2014	37				—
	Notes due 2015 through 2026, average effective interest rate 1.3% in both 2014 and 2013	8				9
		1,071				1,021
	Less — maturities classified as current	2				2
	Total long-term debt	$	1,069			$	1,019
Summary of Short-term Debt Obligations	Information regarding our short-term debt as of and for the years ended December 31, 2014 and 2013 is as follows:
		2014				2013
		(Millions)
	Maturities classified as current	$	2			$	2
	Short-term borrowings	58				81
	Total short-term debt	$	60			$	83
		Notes Payable(a)
		2014				2013
		(Dollars in Millions)
	Outstanding borrowings at end of year	$	58			$	81
	Weighted average interest rate on outstanding borrowings at end of year(b)	2.6		%		4.4		%
	Maximum month-end outstanding borrowings during year	$	124			$	177
	Average month-end outstanding borrowings during year	$	107			$	116
	Weighted average interest rate on average month-end outstanding borrowings during year(b)	4		%		4.7		%
	(a)	Includes borrowings under both committed credit facilities and uncommitted lines of credit and similar arrangements.
	(b)	This calculation does not include the commitment fees to be paid on the unused revolving credit facility balances which are recorded as interest expense for accounting purposes.
Financing Arrangements	Financing Arrangements
		Committed Credit Facilities(a) as of December 31, 2014
		Term		Commitments				Borrowings			Letters of			Available
											Credit(b)
		(Millions)
	Tenneco Inc. revolving credit agreement	2019		1,200				—			34			1,166
	Tenneco Inc. tranche A term facility	2019		300				300			—			—
	Subsidiaries’ credit agreements	2015-2026		152				104			—			48
				$	1,652			$	404		$	34		$	1,214
	(a)	We generally are required to pay commitment fees on the unused portion of the total commitment.
	(b)	Letters of credit reduce the available borrowings under the revolving credit agreement.
Financial Ratios under Senior Credit Facility	The financial ratios required under the amended and restated senior credit facility (or the predecessor facility, as applicable) and the actual ratios we achieved for the four quarters of 2014, are as follows:
		Quarter Ended
		December 31,						September 30,					June 30,			March 31,
		2014						2014					2014			2014
		Req.			Act.			Req.		Act.			Req.		Act.	Req.	Act.
	Leverage Ratio (maximum)	3.5			1.22			3.5		1.55			3.5		1.57	3.5	1.63
	Interest Coverage Ratio (minimum)	3.75			11.4			2.75		10.99			2.75		10.62	2.75	10.39
Proforma Consolidated Leverage Ratio	So long as no default existed, we would, however, under our senior credit facility agreement, be permitted to repay or refinance our senior notes (i) with the net cash proceeds of permitted refinancing indebtedness (as defined in the senior credit facility agreement) or with the net cash proceeds of our common stock in each case issued within 180 days prior to such repayment; (ii) with the net cash proceeds of the incremental facilities (as defined in the senior credit facility agreement) and certain indebtedness incurred by our foreign subsidiaries; (iii) with the proceeds of the revolving loans (as defined in the senior credit facility agreement); (iv) with the cash generated by our operations; (v) in an amount equal to the net cash proceeds of qualified capital stock (as defined in the senior credit facility agreement) issued by us after December 8, 2014; and (vi) in exchange for permitted refinancing indebtedness or in exchange for shares of our common stock; provided that such purchases are capped as follows (with respect to clauses (iii), (iv) and (v) based on a pro forma consolidated leverage ratio after giving effect to such purchase, cancellation or redemption):
	Pro forma Consolidated	Aggregate Senior
	Leverage Ratio	Note Maximum Amount
		(Millions)
	Greater than or equal to 3.0x	$	20
	Greater than or equal to 2.5x	$	100
	Greater than or equal to 2.0x	$	200
	Less than 2.0x	no limit

Financial_Instruments_Tables

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Carrying and Estimated Fair Value	The carrying and estimated fair values of our financial instruments by class at December 31, 2014 and 2013 were as follows:
		31-Dec-14					31-Dec-13
		Carrying			Fair		Carrying		Fair
		Amount			Value		Amount		Value
		(Millions)
	Long-term debt (including current maturities)	$	1,071		$	1,106	$	1,021	$	1,089
	Instruments with off-balance sheet risk:
	Foreign exchange forward contracts:
	Asset derivative contracts	—			—		—		—
Foreign Exchange Forward Contracts Fair Value on Gross Basis	2013
Fair Value of Financial Assets on Recurring Basis	.
Fair Value Hierarchy	.
Summarization for Foreign Currency Forward Purchase and Sale Contracts	The following table summarizes by major currency the notional amounts for foreign currency forward purchase and sale contracts as of December 31, 2014 (all of which mature in 2015):
			Notional Amount
			in Foreign Currency
			(Millions)
	Australian dollars	—Purchase	3
	British pounds	—Purchase	1
	Canadian dollars	—Sell	(2	)
	European euro	—Purchase	1
		—Sell	(4	)
	Japanese yen	—Sell	(1,268	)
	South African rand	—Purchase	112
	U.S. dollars	—Purchase	14
		—Sell	(10	)

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Income before Income Taxes and Noncontrolling Interests	The domestic and foreign components of our income before income taxes and noncontrolling interests are as follows:
		Year Ended December 31,
		2014			2013			2012
		(Millions)
	U.S. income before income taxes	$	130		$	150		$	166
	Foreign income before income taxes	271			194			157
	Income before income taxes and noncontrolling interests	$	401		$	344		$	323
Comparative Analysis of Components of Income Tax Expense	Following is a comparative analysis of the components of income tax expense:
		Year Ended December 31,
		2014			2013			2012
		(Millions)
	Current —
	U.S. federal	$	38		$	25		$	—
	State and local	3			4			4
	Foreign	92			81			89
		133			110			93
	Deferred —
	U.S. federal	2			(4		)	(25		)
	State and local	7			2			(20		)
	Foreign	(11		)	14			(29		)
		(2		)	12			(74		)
	Income tax expense	$	131		$	122		$	19
Reconciliation of Income Taxes Computed at Statutory U.S. Federal Income Tax Rate to Income Tax Expense	Following is a reconciliation of income taxes computed at the statutory U.S. federal income tax rate (35 percent for all years presented) to the income tax expense reflected in the statements of income:
		Year Ended December 31,
		2014			2013			2012
		(Millions)
	Income tax expense computed at the statutory U.S. federal income tax rate	$	140		$	120		$	113
	Increases (reductions) in income tax expense resulting from:
	Foreign income taxed at different rates	(21		)	(21		)	(21		)
	Taxes on repatriation of dividends	4			9			8
	Remeasurement of estimated tax on unremitted earnings	—			(17		)	—
	State and local taxes on income, net of U.S. federal income tax benefit	8			6			4
	Changes in valuation allowance for tax loss carryforwards and credits	12			27			(91		)
	Foreign tax holidays	(6		)	(5		)	(5		)
	Investment and R&D tax credits	(10		)	(8		)	(1		)
	Foreign earnings subject to U.S. federal income tax	7			5			23
	Adjustment of prior years taxes	(2		)	(1		)	(5		)
	Impact of tax law changes	—			(3		)	(1		)
	Tax contingencies	—			6			(6		)
	Other	(1		)	4			1
	Income tax expense	$	131		$	122		$	19
Components of Our Net Deferred Tax Assets	The components of our net deferred tax assets were as follows:
		Year Ended December 31,
		2014			2013
		(Millions)
	Deferred tax assets —
	Tax loss carryforwards:
	U.S. federal	$	—		$	—
	State	15			23
	Foreign	75			78
	Tax credit benefits	86			88
	Postretirement benefits other than pensions	55			43
	Pensions	56			36
	Bad debts	2			1
	Sales allowances	7			6
	Payroll and other accruals	155			132
	Valuation allowance	(139		)	(135		)
	Total deferred tax assets	312			272
	Deferred tax liabilities —
	Tax over book depreciation	51			56
	Other	59			51
	Total deferred tax liabilities	110			107
	Net deferred tax assets	$	202		$	165
Reconciliation of Deferred Taxes to Deferred Taxes Shown In Balance Sheet	Following is a reconciliation of deferred taxes to the deferred taxes shown in the balance sheet:
		Year Ended December 31,
		2014			2013
		(Millions)
	Balance Sheet:
	Current portion — deferred tax asset	$	81		$	71
	Non-current portion — deferred tax asset	143			125
	Current portion — deferred tax liability shown in other current liabilities	(4		)	(3		)
	Non-current portion — deferred tax liability	(18		)	(28		)
	Net deferred tax assets	$	202		$	165
Reconciliation of our Uncertain Tax Positions	A reconciliation of our uncertain tax positions is as follows:
		2014			2013			2012
		(Millions)
	Uncertain tax positions —
	Balance January 1	$	115		$	107		$	119
	Gross increases in tax positions in current period	8			15			13
	Gross increases in tax positions in prior period	5			—			1
	Gross decreases in tax positions in prior period	(5		)	(1		)	(12		)
	Gross decreases — settlements	(2		)	—			(5		)
	Gross decreases — statute of limitations expired	(7		)	(6		)	(9		)
	Balance December 31	$	114		$	115		$	107
Tax Years Open to Examination in Primary Jurisdictions	We are subject to taxation in the U.S. and various state and foreign jurisdictions. As of December 31, 2014, our tax years open to examination in primary jurisdictions are as follows:
		Open To Tax
		Year
	United States	2000
	China	2004
	Spain	2003
	Canada	2011
	Brazil	2010
	Mexico	2009
	Belgium	2012
	Germany	2010
	United Kingdom	2012

Common_Stock_Tables

Common Stock (Tables)	12 Months Ended
	Dec. 31, 2014
Assumptions Used for Calculating Fair Values of Stock Option Awards	The fair value of share-based awards is determined at the time the awards are granted which is generally in January of each year, and requires judgment in estimating employee and market behavior.
		2014				2013				2012
	Stock Options Granted:
	Weighted average grant date fair value, per share	$	26.46			$	19.84			$	17.35
	Weighted average assumptions used:
	Expected volatility	52.8		%		66.4		%		73.5		%
	Expected lives	5				4.9				4.7
	Risk-free interest rates	1.7		%		0.7		%		0.8		%
	Dividends yields	—		%		—		%		—		%
Stock Options Status and Activity	The following table reflects the status and activity for all options to purchase common stock for the period indicated:
		Year Ended December 31, 2014
		Shares			Weighted Avg.				Weighted Avg.		Aggregate
		Under			Exercise				Remaining		Intrinsic
		Option			Prices				Life in Years		Value
											(Millions)
	Outstanding Stock Options:
	Outstanding, January 1, 2014	1,983,573			$	22.93			4.5		$	62
	Granted	192,624			56.23
	Canceled	(31,299	)		19.78
	Forfeited	(300	)		22.77
	Exercised	(25,595	)		14.72						1
	Outstanding, March 31, 2014	2,119,003			$	26.1			4.6		$	67
	Granted	—			—
	Forfeited	—			—
	Exercised	(32,233	)		25.49						1
	Outstanding, June 30, 2014	2,086,770			$	26.11			4.3		$	75
	Granted	834			66.54
	Canceled	(526	)		36
	Forfeited	(1,535	)		29.72
	Exercised	(12,358	)		23.81						—
	Outstanding, September 30, 2014	2,073,185			$	26.13			4.1		$	77
	Granted	—			—
	Canceled	—			—
	Forfeited	(12,182	)		47.36
	Exercised	(607,000	)		13.66						24
	Outstanding, December 31, 2014	1,454,003			$	31.16			4.4		$	33
Nonvested Restricted Shares	The following table reflects the status for all nonvested restricted shares for the period indicated:
		Year Ended December 31, 2014
		Shares			Weighted Avg.
					Grant Date
					Fair Value
	Nonvested Restricted Shares
	Nonvested balance at January 1, 2014	368,268			$	34.9
	Granted	131,561			54.9
	Vested	(186,112	)		36.57
	Forfeited	—			—
	Nonvested balance at March 31, 2014	313,717			$	42.3
	Granted	2,838			66.96
	Vested	(2,286	)		31.63
	Forfeited	(575	)		38.52
	Nonvested balance at June 30, 2014	313,694			$	42.6
	Granted	1,160			67.02
	Vested	(10,664	)		55.36
	Forfeited	—			—
	Nonvested balance at September 30, 2014	304,190			$	42.25
	Granted	—			—
	Vested	(11,040	)		36.37
	Forfeited	(7,099	)		47.37
	Nonvested balance at December 31, 2014	286,051			$	42.35

Pension_Plans_Postretirement_a1

Pension Plans, Postretirement and Other Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2014
Pension Plan Assets Invested	Pension plan assets were invested in the following classes of securities:
		Percentage of Fair Market Value
		31-Dec-14						31-Dec-13
		US			Foreign			US			Foreign
	Equity Securities	70	%		60	%		71	%		62	%
	Debt Securities	30	%		32	%		29	%		31	%
	Real Estate	—			4	%		—			2	%
	Other	—			4	%		—	%		5	%
Plan Assets using Fair Value Hierarchy	The following table presents our plan assets using the fair value hierarchy as of December 31, 2014 and 2013, respectively. The fair value hierarchy has three levels based on the methods used to determine the fair value. Level 1 assets refer to those asset values based on quoted market prices in active markets for identical assets at the measurement date. Level 2 assets refer to assets with values determined using significant other observable inputs, and Level 3 assets include values determined with non-observable inputs.
		Fair Value Level as of December 31, 2014
		US											Foreign
	Asset Category	Level 1				Level 2				Level 3			Level 1				Level 2			Level 3
		(Millions)
	Equity securities:
	U.S. large cap	$	41			$	134			$	—		$	31			$	25		$	—
	U.S. mid cap	—				—				—			4				5			—
	U.S. Small Cap	—				25				—			—				—			—
	Non-U.S. large cap	—				—				—			57				68			—
	Non-U.S. mid cap	—				24				—			20				16			—
	Non-U.S. small cap	—				—				—			1				6			—
	Emerging markets	—				8				—			—				3			—
	Debt securities:
	U.S. corporate bonds	—				5				—			—				5			—
	U.S. other fixed income	—				95				—			—				—			—
	Non-U.S. treasuries/government bonds	—				—				—			41				27			—
	Non-U.S. corporate bonds	—				—				—			20				27			—
	Non-U.S. mortgage backed securities	—				—				—			—				2			—
	Non-U.S. municipal obligations	—				—				—			1				—			—
	Non-U.S. asset backed securities	—				—				—			—				—			—
	Non-U.S. other fixed income	—				—				—			1				—			—
	Real Estate:
	Non-U.S. real estate	—				—				—			—				6			—
	Other:
	Insurance contracts	—				—				—			—				13			9
	Cash held in bank accounts	2				—				—			4				—			—
	Total	$	43			$	291			$	—		$	180			$	203		$	9
		Fair Value Level as of December 31, 2013
		US											Foreign
	Asset Category	Level 1				Level 2				Level 3			Level 1				Level 2			Level 3
		(Millions)
	Equity securities:
	U.S. large cap	$	41			$	143			$	—		$	31			$	21		$	—
	U.S. mid cap	—				—				—			4				4			—
	U.S. Small Cap	—				27				—			—				—			—
	Non-U.S. large cap	—				—				—			57				71			—
	Non-U.S. mid cap	—				27				—			20				19			—
	Non-U.S. small cap	—				—				—			1				7			—
	Emerging markets	—				8				—			—				4			—
	Debt securities:
	U.S. corporate bonds	—				5				—			—				4			—
	U.S. other fixed income	—				96				—			—				—			—
	Non-U.S. treasuries/government bonds	—				—				—			35				25			—
	Non-U.S. corporate bonds	—				—				—			18				18			—
	Non-U.S. mortgage backed securities	—				—				—			—				4			—
	Non-U.S. municipal obligations	—				—				—			1				—			—
	Non-U.S. asset backed securities	—				—				—			—				3			—
	Non-U.S. other fixed income	—				—				—			1				2			—
	Real Estate:
	Non-U.S. real estate	—				—				—			1				5			—
	Other:
	Insurance contracts	—				—				—			—				9			8
	Cash held in bank accounts	—				—				—			6				—			—
	Total	$	41			$	306			$	—		$	175			$	196		$	8
Changes in Fair Value of Level 3 Assets	The table below summarizes the changes in the fair value of the Level 3 assets:
		31-Dec-14								31-Dec-13
		Level 3 Assets								Level 3 Assets
		US				Foreign				US			Foreign
		(Millions)								(Millions)
	Balance at December 31 of the previous year	$	—			$	8			$	—		$	8
	Actual return on plan assets:
	Relating to assets still held at the reporting date	—				1				—			—
	Ending Balance at December 31	$	—			$	9			$	—		$	8
Significant Concentrations of Risk	The following table contains information about significant concentrations of risk, including all individual assets that make up more than 5 percent of the total assets and any direct investments in Tenneco stock:
	Asset Category	Fair Value Level			Value				Percentage of
									Total Assets
		(Millions)
	2014:00:00
	Tenneco Stock	1			$	41			5.6	%
	2013:00:00
	Tenneco Stock	1			$	41			5.6	%
Amounts Recognized in Balance Sheets for Pension Plans and Postretirement Benefit Plan	A summary of the change in benefit obligation, the change in plan assets, the development of net amount recognized, and the amounts recognized in the balance sheets for the pension plans and postretirement benefit plan follows:
		Pension															Postretirement
		2014								2013							2014			2013
		US				Foreign				US			Foreign				US			US
		(Millions)
	Change in benefit obligation:
	Benefit obligation at December 31 of the previous year	$	421			$	442			$	461		$	431			$	112		$	131
	Currency rate conversion	—				(41		)		—			(2		)		—			—
	Settlement	(53		)		—				—			(1		)		—			—
	Curtailment	—				—							(1		)
	Service cost	1				8				1			9				—			—
	Interest cost	20				18				19			17				6			5
	Administrative expenses/taxes paid	—				(2		)		—			(2		)		—			—
	Plan amendments	—				—				—			1				—			—
	Actuarial (gain)/loss	77				73				(41		)	6				18			(16		)
	Prior period correction	—				—				—			—				15			—
	Benefits paid	(18		)		(17		)		(19		)	(18		)		(8		)	(8		)
	Participants’ contributions	—				2				—			2				—			—
	Benefit obligation at December 31	$	448			$	483			$	421		$	442			$	143		$	112
	Change in plan assets:
	Fair value at December 31 of the previous year	$	347			$	379			$	275		$	332			$	—		$	—
	Currency rate conversion	—				(32		)		—			(3		)		—			—
	Settlement	(41		)		—				—			(1		)		—			—
	Actual return on plan assets	23				40				60			43				—			—
	Administrative expenses/taxes paid	—				(2		)		—			(2		)		—			—
	Employer contributions	23				22				31			26				8			8
	Prescription drug subsidy received	—				—				—			—				—			—
	Participants’ contributions	—				2				—			2				—			—
	Benefits paid	(18		)		(17		)		(19		)	(18		)		(8		)	(8		)
	Fair value at December 31	$	334			$	392			$	347		$	379			$	—		$	—
	Development of net amount recognized:
	Unfunded status at December 31	$	(115	)		$	(90	)		$	(74	)	$	(62	)		$	(143	)	$	(112	)
	Unrecognized cost:
	Actuarial loss	230				172				190			137				53			32
	Prior service cost/(credit)	1				5				1			7				(10		)	(16		)
	Net amount recognized at December 31	$	116			$	87			$	117		$	82			$	(100	)	$	(96	)
	Amounts recognized in the balance sheets as of December 31
	Noncurrent assets	—				8				—			11				—			—
	Current liabilities	(10		)		(3		)		(6		)	(2		)		(9		)	(8		)
	Noncurrent liabilities	(105		)		(95		)		(68		)	(71		)		(134		)	(104		)
	Net amount recognized	$	(115	)		$	(90	)		$	(74	)	$	(62	)		$	(143	)	$	(112	)
Components of Net Periodic Benefit Cost	Net periodic postretirement benefit cost for the years 2014, 2013, and 2012, consists of the following components:
		2014				2013				2012
		(Millions)
	Service cost — benefits earned during the year	$	—			$	—			$	1
	Interest on accumulated postretirement benefit obligation	6				5				6
	Net amortization:
	Actuarial loss	4				4				5
	Prior service credit	(7		)		(6		)		(6		)
	Prior period correction	9				$	—			$	—
	Net periodic postretirement benefit cost	$	12			$	3			$	6
	Net periodic pension costs for the years 2014, 2013 and 2012, consist of the following components:
		2014								2013							2012
		US				Foreign				US			Foreign				US			Foreign
		(Millions)
	Service cost — benefits earned during the year	$	1			$	8			$	1		$	9			$	1		$	7
	Interest cost	20				18				19			17				20			18
	Expected return on plan assets	(25		)		(23		)		(22		)	(20		)		(22		)	(20		)
	Curtailment loss	—				—				—			—				—			—
	Settlement loss	21				—				—			1				—			1
	Net amortization:
	Actuarial loss	7				7				9			10				7			7
	Prior service cost	—				2				—			1				—			2
	Net pension costs	$	24			$	12			$	7		$	18			$	6		$	15
Amounts recognized in accumulated other comprehensive loss for pension benefits	Amounts recognized in accumulated other comprehensive loss for pension benefits consist of the following components:
		2014								2013
		US				Foreign				US			Foreign
		(Millions)
	Net actuarial loss	$	230			$	172			$	190		$	137
	Prior service cost	1				5				1			7
		$	231			$	177			$	191		$	144
Amounts Recognized for Pension and Postretirement Benefits in Other Comprehensive Income	Amounts recognized for pension and postretirement benefits in other comprehensive income for the year ended December 31, 2014 and 2013 include the following components:
		Year Ended December 31,
		2014											2013
		Before-Tax				Tax				Net-of-Tax			Before-Tax				Tax			Net-of-Tax
		Amount				Benefit				Amount			Amount				Benefit			Amount
		(Millions)
	Defined benefit pension and postretirement plans:
	Change in total actuarial gain (loss)	$	(124	)		$	35			$	(89	)	$	113			$	(41	)	$	72
	Amortization of prior service cost included in net periodic pension and postretirement cost	(5		)		1				(4		)	(5		)		2			(3		)
	Amortization of actuarial gain (loss) included in net periodic pension and postretirement cost	18				(5		)		13			23				(7		)	16
	Other comprehensive income — pension benefits	$	(111	)		$	31			$	(80	)	$	131			$	(46	)	$	85
Components of Net Periodic Benefit Cost	In 2015, we expect to recognize the following amounts, which are currently reflected in accumulated other comprehensive loss, as components of net periodic benefit cost:
		2015
		(Millions)
	Net actuarial loss	$	5
	Prior service credit	(4		)
		$	1
	In 2015, we expect to recognize the following amounts, which are currently reflected in accumulated other comprehensive loss, as components of net periodic benefit cost:
		2015
		US				Foreign
		(Millions)
	Net actuarial loss	$	8			$	9
	Prior service cost	—				1
		$	8			$	10
Projected Benefit Obligation Accumulated Benefit Obligation and Fair Value of Plan Assets for all Pension Plans	The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for all pension plans with accumulated benefit obligations in excess of plan assets at December 31, 2014 and 2013 were as follows:
		31-Dec-14								31-Dec-13
		US				Foreign				US			Foreign
		(Millions)
	Projected benefit obligation	$	448			$	349			$	421		$	289
	Accumulated benefit obligation	448				344				421			286
	Fair value of plan assets	334				253				347			218
Estimated Pension Plan Benefit Payments	The following estimated benefit payments are payable from the pension plans to participants:
	Year	US				Foreign
		(Millions)
	2015	$	29			$	18
	2016	21				19
	2017	29				18
	2018	22				19
	2019	24				22
	2020-2023	122				113
Assumptions used in accounting for Pension Plans	The following assumptions were used in the accounting for the pension plans for the years of 2014, 2013, and 2012:
		2014						2013
		US			Foreign			US			Foreign
	Weighted-average assumptions used to determine benefit obligations
	Discount rate	4.1	%		3.3	%		4.8	%		4.3	%
	Rate of compensation increase	N/A			3.4	%		N/A			3.3	%
		2014						2013					2012
		US			Foreign			US			Foreign		US			Foreign
	Weighted-average assumptions used to determine net periodic benefit cost
	Discount rate	4.8	%		4.3	%		4.1	%		4.2	%	4.8	%		4.9	%
	Expected long-term return on plan assets	7.8	%		6.1	%		7.8	%		6.2	%	8.3	%		6.3	%
	Rate of compensation increase	N/A			3.3	%		N/A			3.4	%	N/A			3.5	%
Estimated Postretirement Benefit Payments	The following estimated postretirement benefit payments are payable from the plan to participants:
	Year	Postretirement
		Benefits
		(Millions)
	2015	$	9
	2016	9
	2017	9
	2018	9
	2019	9
	2020-2023	42
Postretirement Cost	The following assumptions were used in the accounting for postretirement cost for the years of 2014, 2013 and 2012:
		2014			2013
	Weighted-average assumptions used to determine benefit obligations
	Discount rate	4.1	%		4.8	%
	Rate of compensation increase	N/A			N/A
		2014			2013			2012
	Weighted-average assumptions used to determine net periodic benefit cost
	Discount rate	4.8	%		4.1	%		4.8	%
	Rate of compensation increase	N/A			N/A			N/A

Segment_and_Geographic_Area_In1

Segment and Geographic Area Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Information	Segment results for 2014, 2013 and 2012 are as follows:
		Clean Air Division									Ride Performance Division
		North			Europe, South America & India				Asia		North		Europe, South America & India			Asia		Other			Reclass & Elims			Total
		America							Pacific		America					Pacific
		(Millions)
	At December 31, 2014, and for the Year Ended
	Revenues from external customers	$	2,815		$	1,974			$	1,022	$	1,351	$	1,032		$	226	$	—		$	—		$	8,420
	Intersegment revenues	25			114				—		10		38			43		—			(230		)	—
	EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	237			59				101		143		40			36		(124		)	—			492
	Total assets	1,165			789				593		664		503			227		—			69			4,010
	At December 31, 2013, and for the Year Ended
	Revenues from external customers	2,658			1,934				852		1,255		1,046			219		—			—			7,964
	Intersegment revenues	8			111				1		10		41			32		—			(203		)	—
	EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	229			57				84		124		(7		)	22		(85		)	—			424
	Total assets	1,030			827				544		628		552			213		—			36			3,830
	At December 31, 2012, and for the Year Ended
	Revenues from external customers	$	2,506		$	1,726			$	694	$	1,213	$	1,041		$	183	$	—		$	—		$	7,363
	Intersegment revenues	6			101				1		10		53			30		—			(201		)	—
	EBIT, Earnings (loss) before interest expense, income taxes, and noncontrolling interests	202			54				71		122		41			5		(67		)	—			428
	Total assets	1,029			725				435		593		600			202		—			24			3,608
Revenue from External Customers Table	The following table shows information relating to our external customer revenues for each product or each group of similar products:
		Net Sales
		Year Ended December 31,
		2014			2013				2012
		(Millions)
	Emission Control Products & Systems
	Aftermarket	$	318		$	327			$	318
	Original Equipment
	OE Value-add	3,559			3,282				2,948
	OE Substrate	1,934			1,835				1,660
		5,493			5,117				4,608
		5,811			5,444				4,926
	Ride Control Products & Systems
	Aftermarket	976			953				944
	Original Equipment	1,633			1,567				1,493
		2,609			2,520				2,437
	Total Revenues	$	8,420		$	7,964			$	7,363
Revenue Percent by Major Customers	The following customers accounted for 10 percent or more of our net sales in the last three years. The net sales to both customers were across segments.
	Customer	2014		2013			2012
	General Motors Company	15	%	15	%		17	%
	Ford Motor Company	13	%	14	%		15	%
Geographic Information Table	The following table shows information relating to the geographic regions in which we operate:
		Geographic Area
		United			China				Germany		Mexico		Canada			Other		Reclass &			Consolidated
		States														Foreign(a)		Elims
		(Millions)
	At December 31, 2014, and for the Year Then Ended
	Revenues from external customers(b)	$	3,348		$	1,079			$	955	$	423	$	413		$	2,202	$	—		$	8,420
	Long-lived assets(c)	473			192				113		34		52			487		—			1,351
	Total assets	1,710			683				319		156		164			1,133		(155		)	4,010
	At December 31, 2013, and for the Year Then Ended
	Revenues from external customers(b)	$	3,144		$	875			$	941	$	397	$	387		$	2,220	$	—		$	7,964
	Long-lived assets(c)	448			158				120		31		59			500		—			1,316
	Total assets	1,552			602				358		126		182			1,200		(190		)	3,830
	At December 31, 2012, and for the Year Then Ended
	Revenues from external customers(b)	$	2,975		$	661			$	817	$	374	$	389		$	2,147	$	—		$	7,363
	Long-lived assets(c)	429			139				115		31		57			490		—			1,261
	Total assets	1,521			448				344		120		168			1,187		(180		)	3,608
	(a)	Revenues from external customers and long-lived assets for individual foreign countries other than China, Germany, Mexico, and Canada are not material.
	(b)	Revenues are attributed to countries based on location of the shipper.
	(c)	Long-lived assets include all long-term assets except goodwill, intangibles and deferred tax assets.

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Warranty Accrual Table	Below is a table that shows the activity in the warranty accrual accounts:
		Year Ended
		December 31,
		2014			2013			2012
		(Millions)
	Beginning Balance	$	24		$	23		$	26
	Accruals related to product warranties	24			20			15
	Reductions for payments made	(22		)	(19		)	(18		)
	Ending Balance	$	26		$	24		$	23

Supplemental_Guarantor_Condens1

Supplemental Guarantor Condensed Consolidating Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2014
Statement of Comprehensive Income (Loss)	STATEMENT OF COMPREHENSIVE INCOME (LOSS)
		For the Year Ended December 31, 2014
		Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
		Subsidiaries			Subsidiaries			(Parent			& Elims
								Company)
		(Millions)
	Revenues
	Net sales and operating revenues —
	External	$	3,727		$	4,693		$	—		$	—		$	8,420
	Affiliated companies	403			602			—			(1,005		)	—
		4,130			5,295			—			(1,005		)	8,420
	Costs and expenses
	Cost of sales (exclusive of depreciation and amortization shown below)	3,391			4,639			—			(1,005		)	7,025
	Goodwill impairment charge	—			—			—			—			—
	Engineering, research, and development	81			88			—			—			169
	Selling, general, and administrative	211			302			6			—			519
	Depreciation and amortization of other intangibles	86			122			—			—			208
		3,769			5,151			6			(1,005		)	7,921
	Other income (expense)
	Loss on sale of receivables	—			(4		)	—			—			(4		)
	Other income (expense)	26			9			—			(38		)	(3		)
		26			5			—			(38		)	(7		)
	Earnings (loss) before interest expense, income taxes, noncontrolling interests and equity in net income from affiliated companies	387			149			(6		)	(38		)	492
	Interest expense —
	External (net of interest capitalized)	(1		)	4			88			—			91
	Affiliated companies (net of interest income)	73			(75		)	2			—			—
	Earnings (loss) before income taxes, noncontrolling interests and equity in net income from affiliated companies	315			220			(96		)	(38		)	401
	Income tax expense	94			37			—			—			131
	Equity in net income (loss) from affiliated companies	129			—			322			(451		)	—
	Net income (loss)	350			183			226			(489		)	270
	Less: Net income attributable to noncontrolling interests	—			44			—			—			44
	Net income (loss) attributable to Tenneco Inc.	$	350		$	139		$	226		$	(489	)	$	226
	Comprehensive income (loss) attributable to Tenneco Inc.	$	350		$	139		$	41		$	(489	)	$	41
	STATEMENT OF COMPREHENSIVE INCOME (LOSS)
		For the Year Ended December 31, 2013
		Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
		Subsidiaries			Subsidiaries			(Parent			& Elims
								Company)
		(Millions)
	Revenues
	Net sales and operating revenues —
	External	$	3,498		$	4,466		$	—		$	—		$	7,964
	Affiliated companies	350			572			—			(922		)	—
		3,848			5,038			—			(922		)	7,964
	Costs and expenses
	Cost of sales (exclusive of depreciation and amortization shown below)	3,103			4,553			—			(922		)	6,734
	Goodwill impairment charge	—			—			—			—			—
	Engineering, research, and development	66			78			—			—			144
	Selling, general, and administrative	187			260			6			—			453
	Depreciation and amortization of other intangibles	78			127			—			—			205
		3,434			5,018			6			(922		)	7,536
	Other income (expense)
	Loss on sale of receivables	—			(4		)	—			—			(4		)
	Other income (expense)	(1		)	59			—			(58		)	—
		(1		)	55			—			(58		)	(4		)
	Earnings (loss) before interest expense, income taxes, noncontrolling interests and equity in net income from affiliated companies	413			75			(6		)	(58		)	424
	Interest expense —
	External (net of interest capitalized)	(2		)	5			77			—			80
	Affiliated companies (net of interest income)	70			(72		)	2			—			—
	Earnings (loss) before income taxes, noncontrolling interests and equity in net income from affiliated companies	345			142			(85		)	(58		)	344
	Income tax expense	60			62			—			—			122
	Equity in net income (loss) from affiliated companies	32			—			268			(300		)	—
	Net income (loss)	317			80			183			(358		)	222
	Less: Net income attributable to noncontrolling interests	—			39			—			—			39
Net income (loss) attributable to Tenneco Inc.	$	317		$	41		$	183		$	(358	)	$	183
Comprehensive income (loss) attributable to Tenneco Inc.	$	317		$	41		$	231		$	358		$	231
STATEMENT OF COMPREHENSIVE INCOME (LOSS)
	For the Year Ended December 31, 2012
	Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
	Subsidiaries			Subsidiaries			(Parent			& Elims
							Company)
	(Millions)
Revenues
Net sales and operating revenues —
External	$	3,331		$	4,032		$	—		$	—		$	7,363
Affiliated companies	182			547			—			(729		)	—
	3,513			4,579			—			(729		)	7,363
Costs and expenses
Cost of sales (exclusive of depreciation and amortization shown below)	3,056			3,843			—			(729		)	6,170
Goodwill impairment charge	—			—			—			—			—
Engineering, research, and development	57			69			—			—			126
Selling, general, and administrative	198			224			5			—			427
Depreciation and amortization of other intangibles	72			133			—			—			205
	3,383			4,269			5			(729		)	6,928
Other income (expense)
Loss on sale of receivables	—			(4		)	—			—			(4		)
Other income (expense)	115			(71		)	—			(47		)	(3		)
	115			(75		)	—			(47		)	(7		)
Earnings (loss) before interest expense, income taxes, noncontrolling interests, and equity in net income from affiliated companies	245			235			(5		)	(47		)	428
Interest expense —
External (net of interest capitalized)	—			5			100			—			105
Affiliated companies (net of interest income)	212			(81		)	(131		)	—			—
Earnings (loss) before income taxes, noncontrolling interests, and equity in net income from affiliated companies	33			311			26			(47		)	323
Income tax expense	(39		)	58			—			—			19
Equity in net income (loss) from affiliated companies	217			—			249			(466		)	—
Net income (loss)	289			253			275			(513		)	304
Less: Net income attributable to noncontrolling interests	—			29			—			—			29
Net income (loss) attributable to Tenneco Inc.	$	289		$	224		$	275		$	(513	)	$	275
Comprehensive income (loss) attributable to Tenneco Inc.	$	289		$	224		$	249		$	(513	)	$	249
Balance Sheet	BALANCE SHEET
		31-Dec-14
		Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
		Subsidiaries			Subsidiaries			(Parent			& Elims
								Company)
		(Millions)
	ASSETS
	Current assets:
	Cash and cash equivalents	$	10		$	272		$	—		$	—		$	282
	Restricted cash	—			3			—			—			3
	Receivables, net	408			1,309			—			(629		)	1,088
	Inventories	312			376			—			—			688
	Deferred income taxes	49			25			7			—			81
	Prepayments and other	96			188			—			—			284
	Total current assets	875			2,173			7			(629		)	2,426
	Other assets:
	Investment in affiliated companies	1,064			—			764			(1,828		)	—
	Notes and advances receivable from affiliates	944			10,589			4,844			(16,377		)	—
	Long-term receivables, net	12			—			—			—			12
	Goodwill	22			43			—			—			65
	Intangibles, net	10			16			—			—			26
	Deferred income taxes	76			14			53			—			143
	Other	40			53			27			—			120
		2,168			10,715			5,688			(18,205		)	366
	Plant, property, and equipment, at cost	1,236			2,254			—			—			3,490
	Less — Accumulated depreciation and amortization	(845		)	(1,427		)	—			—			(2,272		)
		391			827			—			—			1,218
	Total assets	$	3,434		$	13,715		$	5,695		$	(18,834	)	$	4,010
	LIABILITIES AND SHAREHOLDERS’ EQUITY
	Current liabilities:
	Short-term debt (including current maturities of long-term debt)
	Short-term debt — non-affiliated	$	—		$	54		$	6		$	—		$	60
	Short-term debt — affiliated	243			220			9			(472		)	—
	Accounts payable	478			1,000			—			(106		)	1,372
	Accrued taxes	(15		)	31			24			—			40
	Other	134			241			3			(51		)	327
	Total current liabilities	840			1,546			42			(629		)	1,799
	Long-term debt — non-affiliated	—			44			1,025			—			1,069
	Long-term debt — affiliated	1,730			10,516			4,131			(16,377		)	—
	Deferred income taxes	—			18			—			—			18
	Postretirement benefits and other liabilities	418			129			—			4			551
	Commitments and contingencies
	Total liabilities	2,988			12,253			5,198			(17,002		)	3,437
	Redeemable noncontrolling interests	—			35			—			—			35
	Tenneco Inc. Shareholders’ equity	446			1,386			497			(1,832		)	497
	Noncontrolling interests	—			41			—			—			41
	Total equity	446			1,427			497			(1,832		)	538
	Total liabilities, redeemable noncontrolling interests and equity	$	3,434		$	13,715		$	5,695		$	(18,834	)	$	4,010
	BALANCE SHEET
		31-Dec-13
		Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
		Subsidiaries			Subsidiaries			(Parent			& Elims
								Company)
		(Millions)
	ASSETS
	Current assets:
	Cash and cash equivalents	$	6		$	269		$	—		$	—		$	275
	Restricted cash	—			5			—			—			5
	Receivables, net	387			1,306			16			(649		)	1,060
	Inventories	279			377			—			—			656
	Deferred income taxes	87			—			7			(23		)	71
	Prepayments and other	35			188			—			—			223
	Total current assets	794			2,145			23			(672		)	2,290
	Other assets:
Investment in affiliated companies	944			—			696			(1,640		)	—
Notes and advances receivable from affiliates	1,026			7,320			4,826			(13,172		)	—
Long-term receivables, net	12			2			—			—			14
Goodwill	22			47			—			—			69
Intangibles, net	13			17			—			—			30
Deferred income taxes	72			9			44			—			125
Other	44			60			23			—			127
	2,133			7,455			5,589			(14,812		)	365
Plant, property, and equipment, at cost	1,173			2,325			—			—			3,498
Less — Accumulated depreciation and amortization	(807		)	(1,516		)	—			—			(2,323		)
	366			809			—			—			1,175
Total assets	$	3,293		$	10,409		$	5,612		$	(15,484	)	$	3,830
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Short-term debt (including current maturities of long-term debt)
Short-term debt — non-affiliated	$	—		$	68		$	15		$	—		$	83
Short-term debt — affiliated	247			176			10			(433		)	—
Accounts payable	521			1,011			—			(173		)	1,359
Accrued taxes	9			31			—			—			40
Other	128			285			9			(66		)	356
Total current liabilities	905			1,571			34			(672		)	1,838
Long-term debt — non-affiliated	—			8			1,011			—			1,019
Long-term debt — affiliated	1,700			7,338			4,134			(13,172		)	—
Deferred income taxes	—			28			—			—			28
Postretirement benefits and other liabilities	357			92			—			4			453
Commitments and contingencies
Total liabilities	2,962			9,037			5,179			(13,840		)	3,338
Redeemable noncontrolling interests	—			20			—			—			20
Tenneco Inc. Shareholders’ equity	331			1,313			433			(1,644		)	433
Noncontrolling interests	—			39			—			—			39
Total equity	331			1,352			433			(1,644		)	472
Total liabilities, redeemable noncontrolling interests and equity	$	3,293		$	10,409		$	5,612		$	(15,484	)	$	3,830
Statement of Cash Flows	STATEMENT OF CASH FLOWS
		Year Ended December 31, 2014
		Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
		Subsidiaries			Subsidiaries			(Parent			& Elims
								Company)
		(Millions)
	Operating Activities
	Net cash provided (used) by operating activities	$	44		$	314		$	21		$	(38	)	$	341
	Investing Activities
	Proceeds from sale of assets	—			3			—			—			3
	Cash payments for plant, property, and equipment	(106		)	(222		)	—			—			(328		)
	Cash payments for software related intangible assets	(5		)	(8		)	—			—			(13		)
	Cash payments for net assets purchased	(3		)	—			—			—			(3		)
	Changes in restricted cash	—			2			—			—			2
	Net cash used by investing activities	(114		)	(225		)	—			—			(339		)
	Financing Activities
	Retirement of long-term debt	—			(9		)	(453		)	—			(462		)
	Issuance of long-term debt	—			45			525			—			570
	Debt issuance cost on long-term debt	—			—			(12		)	—			(12		)
	Tax benefit from stock-based compensation	—			—			26			—			26
	Purchase of common stock under the share repurchase program	—			—			(22		)	—			(22		)
	Issuance of common stock	—			—			19			—			19
	Increase in bank overdrafts	—			6			—			—			6
	Net increase in revolver borrowings and short-term debt excluding current maturities of long-term debt and short-term borrowings secured by accounts receivable	—			(13		)	(57		)	—			(70		)
	Net increase (decrease) in short-term borrowings secured by accounts receivable	—			—			(10		)	—			(10		)
	Intercompany dividends and net increase (decrease) in intercompany obligations	74			(75		)	(37		)	38			—
	Capital contribution from noncontrolling interest partner	—			5			—			—			5
	Distribution to noncontrolling interests partners	—			(30		)	—			—			(30		)
	Net cash provided (used) by financing activities	74			(71		)	(21		)	38			20
	Effect of foreign exchange rate changes on cash and cash equivalents	—			(15		)	—			—			(15		)
	Increase in cash and cash equivalents	4			3			—			—			7
	Cash and cash equivalents, January 1	6			269			—			—			275
	Cash and cash equivalents, December 31 (Note)	$	10		$	272		$	—		$	—		$	282
	Note:	Cash and cash equivalents include highly liquid investments with a maturity of three months or less at the date of purchase.
	STATEMENT OF CASH FLOWS
		Year Ended December 31, 2013
		Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
		Subsidiaries			Subsidiaries			(Parent			& Elims
								Company)
		(Millions)
	Operating Activities
	Net cash provided (used) by operating activities	$	270		$	244		$	48		$	(59	)	$	503
	Investing Activities
	Proceeds from sale of assets	1			7			—			—			8
	Cash payments for plant, property, and equipment	(102		)	(142		)	—			—			(244		)
	Cash payments for software related intangible assets	(19		)	(6		)	—			—			(25		)
	Change in restricted cash	—			(5		)	—			—			(5		)
	Net cash used by investing activities	(120		)	(146		)	—			—			(266		)
	Financing Activities
	Retirement of long-term debt	—			(2		)	(14		)	—			(16		)
	Tax benefit from stock-based compensation	—			—			24			—			24
	Purchase of common stock under the share repurchase program	—			—			(27		)	—			(27		)
	Issuance of common stock	—			—			20			—			20
	Increase in bank overdrafts	—			(6		)	—			—			(6		)
	Net increase in revolver borrowings and short-term debt excluding current maturities of long-term debt and short-term borrowings secured by accounts receivable	—			(43		)	21			—			(22		)
	Net increase in short-term borrowings secured by accounts receivable	—			—			(40		)	—			(40		)
	Intercompany dividends and net increase (decrease) in intercompany obligations	(148		)	121			(32		)	59			—
	Purchase of noncontrolling equity interest	—			(69		)	—			—			(69		)
	Distribution to noncontrolling interests partners	—			(39		)	—			—			(39		)
	Net cash provided (used) by financing activities	(148		)	(38		)	(48		)	59			(175		)
	Effect of foreign exchange rate changes on cash and cash equivalents	—			(10		)	—			—			(10		)
	Increase in cash and cash equivalents	2			50			—			—			52
	Cash and cash equivalents, January 1	4			219			—			—			223
	Cash and cash equivalents, December 31 (Note)	$	6		$	269		$	—		$	—		$	275
Note:	Cash and cash equivalents include highly liquid investments with a maturity of three months or less at the date of purchase.
STATEMENT OF CASH FLOWS
	Year Ended December 31, 2012
	Guarantor			Nonguarantor			Tenneco Inc.			Reclass			Consolidated
	Subsidiaries			Subsidiaries			(Parent			& Elims
							Company)
	(Millions)
Operating Activities
Net cash provided (used) by operating activities	$	385		$	253		$	(226	)	$	(47	)	$	365
Investing Activities
Proceeds from sale of assets	—			3			—			—			3
Cash payments for plant, property, and equipment	(101		)	(155		)	—			—			(256		)
Cash payments for software related intangible assets	(6		)	(7		)	—			—			(13		)
Cash payments for net assets purchased	(7		)	—			—			—			(7		)
Net cash used by investing activities	(114		)	(159		)	—			—			(273		)
Financing Activities
Retirement of long-term debt	—			(1		)	(410		)	—			(411		)
Issuance of long-term debt	—			—			250			—			250
Debt issuance cost on long-term debt	—			—			(13		)	—			(13		)
Purchase of common stock under the share repurchase program	—			—			(18		)	—			(18		)
Issuance of common stock	—			—			5			—			5
Increase in bank overdrafts	—			5			—			—			5
Net decrease in revolver borrowings and short-term debt excluding current maturities of long-term debt	—			48			19			—			67
Net increase in short-term borrowings secured by accounts receivable	—			—			50			—			50
Intercompany dividends and net increase (decrease) in intercompany obligations	(268		)	(122		)	343			47			—
Capital contribution from noncontrolling interest partner	—			5			—			—			5
Purchase of noncontrolling equity interest	—			—			—			—			—
Distribution to noncontrolling interests partners	—			(29		)	—			—			(29		)
Net cash provided (used) by financing activities	(268		)	(94		)	226			47			(89		)
Effect of foreign exchange rate changes on cash and cash equivalents	—			6			—			—			6
Increase (decrease) in cash and cash equivalents	3			6			—			—			9
Cash and cash equivalents, January 1	1			213			—			—			214
Cash and cash equivalents, December 31 (Note)	$	4		$	219		$	—		$	—		$	223
Note:	Cash and cash equivalents include highly liquid investments with a maturity of three months or less at the date of purchase.

Quarterly_Financial_Data_Unaud1

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data
	Quarter	Net Sales		Cost of Sales		Earnings Before		Net Income
		and		(Excluding		Interest Expense,		Attributable
		Operating		Depreciation and		Income Taxes		to Tenneco
		Revenues		Amortization)		and Noncontrolling		Inc.
						Interests
		(Millions)
	2014
	1st	$	2,094	$	1,754	$	113	$	46
	2nd	2,241		1,851		156		81
	3rd	2,081		1,735		140		78
	4th	2,004		1,685		83		21
		$	8,420	$	7,025	$	492	$	226
	2013
	1st	$	1,903	$	1,604	$	93	$	54
	2nd	2,067		1,736		141		63
	3rd	1,963		1,691		72		12
	4th	2,031		1,703		118		54
		$	7,964	$	6,734	$	424	$	183
	Quarter	Basic		Diluted
		Earnings		Earnings
		per Share of		per Share of
		Common Stock		Common Stock
	2014
	1st	$	0.76	$	0.75
	2nd	1.34		1.32
	3rd	1.29		1.27
	4th	0.34		0.33
	Full Year	3.72		3.66
	2013
	1st	$	0.9	$	0.88
	2nd	1.04		1.02
	3rd	0.19		0.19
	4th	0.9		0.88
	Full Year	3.03		2.97

Summary_of_Accounting_Policies3

Summary of Accounting Policies - Consolidation and Presentation (Narrative) (Details)	Dec. 31, 2014
Minimum
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Range of percentages of investments, equity method investments	20.00%
Maximum
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Range of percentages of investments, equity method investments	50.00%

Summary_of_Accounting_Policies4

Summary of Accounting Policies - Redeemable Noncontrolling Interests (Narrative) (Details) (USD $)	12 Months Ended	1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	31-May-14	Dec. 31, 2013	Dec. 31, 2012
	joint_venture
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Finite Lived Intangible Assets Amortization Expenses	$4		$5	$5
Number of joint ventures	5
CHINA
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Buisness Sale Percentage of Voting Interest Sold		45.00%
Proceeds from Sale of Equity Method Investments		$4
Equity Ownership Percentage after Additional Sale		55.00%
Equity Ownership Percentage Before Additional Sale		100.00%

Redeemable_Non_Controlling_Int

- Redeemable Non Controlling Interest (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Balance January 1	$20	$15	$12
Net income attributable to redeemable noncontrolling interests	23	14	9
Sale of 45 percent equity interest from Tenneco Inc	4	0	0
Capital Contributions	1	0	2
Dividends declared	-13	-9	-8
Balance December 31	$35	$20	$15

Inventories_by_Major_Classific

- Inventories by Major Classification (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accounting Policies [Abstract]
Finished goods	$272	$267
Work in process	221	202
Raw materials	137	130
Materials and supplies	58	57
Inventories	$688	$656

Summary_of_Accounting_Policies5

Summary of Accounting Policies - Goodwill and Intangibles, Net (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2008
Accounting Policies [Abstract]
Goodwill impairment charge	$0	$0	$0
Finite useful life of intangible assets, Minimum	5 years
Finite useful life of intangible assets, Maximum	50 years
Finite Lived Intangible Assets Amortization Expenses	4	5	5
Estimated amortization of intangible assets, 2014	4
Estimated amortization of intangible assets, 2015	3
Estimated amortization of intangible assets, 2016	3
Estimated amortization of intangible assets, 2017	2
Estimated amortization of intangible assets, 2018	1
Capitalization of indefinite life purchased trademarks				$1

Net_Carrying_Amount_of_Goodwil

- Net Carrying Amount of Goodwill (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Intangible Assets And Goodwill [Line Items]
Balance as January 1 Goodwill	$69	$72
Translation adjustments	-4	-3
Balance at December 31 Goodwill	65	69
Clean Air Division [Member] | North America [Member]
Intangible Assets And Goodwill [Line Items]
Balance as January 1 Goodwill	14	14
Translation adjustments	0	0
Balance at December 31 Goodwill	14	14
Clean Air Division [Member] | Europe South America And India [Member]
Intangible Assets And Goodwill [Line Items]
Balance as January 1 Goodwill	14	14
Translation adjustments	-2	0
Balance at December 31 Goodwill	12	14
Clean Air Division [Member] | Asia Pacific
Intangible Assets And Goodwill [Line Items]
Balance as January 1 Goodwill	0	0
Translation adjustments	0	0
Balance at December 31 Goodwill	0	0
Ride Performance Division [Member] | North America [Member]
Intangible Assets And Goodwill [Line Items]
Balance as January 1 Goodwill	10	10
Translation adjustments	0	0
Balance at December 31 Goodwill	10	10
Ride Performance Division [Member] | Europe South America And India [Member]
Intangible Assets And Goodwill [Line Items]
Balance as January 1 Goodwill	31	34
Translation adjustments	-2	-3
Balance at December 31 Goodwill	29	31
Ride Performance Division [Member] | Asia Pacific
Intangible Assets And Goodwill [Line Items]
Balance as January 1 Goodwill	0	0
Translation adjustments	0	0
Balance at December 31 Goodwill	$0	$0

FiniteLived_Intangible_Assets_

- Finite-Lived Intangible Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Acquired Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Amortization Expenses	$4	$5	$5
Gross Carrying Value	48	48
Accumulated Amortization	-23	-19
Customer Contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	8	8
Accumulated Amortization	-4	-4
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	3	3
Accumulated Amortization	-2	-2
Technology Rights
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	26	26
Accumulated Amortization	-15	-12
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	11	11
Accumulated Amortization	($2)	($1)

Plant_Property_and_Equipment_D

- Plant Property, and Equipment (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accounting Policies [Abstract]
Land, buildings, and improvements	$569	$579
Machinery and equipment	2,655	2,673
Other, including construction in progress	266	246
Plant, property, and equipment, at cost	$3,490	$3,498

Summary_of_Accounting_Policies6

Summary of Accounting Policies - Plant, Property, and Equipment, at Cost (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014
Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life of plant, property and equipment	10 years
Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life of plant, property and equipment	50 years
Machinery and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life of plant, property and equipment	3 years
Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life of plant, property and equipment	25 years

Summary_of_Accounting_Policies7

Summary of Accounting Policies - Notes and Accounts Receivable and Allowance for Doubtful Accounts (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accounting Policies [Abstract]
Short-term and long-term accounts receivable outstanding	$1,088	$1,065
Allowance for doubtful accounts on short-term and long-term accounts receivable	16	14
Short and Long-term notes receivable outstanding		5
Allowance for doubtful accounts on short-term and long-term notes receivable	$0	$0

Summary_of_Accounting_Policies8

Summary of Accounting Policies - Pre-production Design and Development and Tooling Assets (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accounting Policies [Abstract]
Unbilled pre-production design and development costs	$23	$30
Original Equipment tools and dies, owned	59
In-process tools and dies built for original equipment customers	$98	$86

Summary_of_Accounting_Policies9

Summary of Accounting Policies - Internal Use Software Assets (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Capitalized software development costs, net of amortization	$54	$55
Amortization of software development costs	$15	$15	$15
Minimum | Software Development [Member]
Finite-Lived Intangible Assets [Line Items]
Finite useful life of intangible assets, Maximum	3 years
Maximum | Software Development [Member]
Finite-Lived Intangible Assets [Line Items]
Finite useful life of intangible assets, Maximum	12 years

Recovered_Sheet1

Summary of Accounting Policies - Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Income tax expense	$131	$122	$19
Impact on earnings related to reversal of valuation allowance	$11

Recovered_Sheet2

Summary of Accounting Policies - Revenue Recognition (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Substrate sales revenue	$1,934	$1,835	$1,660

Recovered_Sheet3

Summary of Accounting Policies - Engineering, Research and Development (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Engineering, research, and development	$169	$144	$126
Customer reimbursements for engineering, research and development expenses	$159	$169	$159

Recovered_Sheet4

Summary of Accounting Policies - Advertising and Promotion Expenses (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Advertising and promotion expenses	$57	$53	$54

Recovered_Sheet5

Summary of Accounting Policies - Foreign Currency Translation (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Foreign currency transaction losses	$1	$13	$8

Recovered_Sheet6

Summary of Accounting Policies - Risk Management Activities (Details) (Forward Contracts, USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Forward Contracts
Derivative [Line Items]
Net asset position (less than $1 million dollars)	($1)

Restricted_Net_Assets_Narrativ

- Restricted Net Assets (Narrative) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accounting Policies [Abstract]
Restricted Net Assets	$218	$177

Earnings_Per_Share_Summary_of_

Earnings Per Share - Summary of Earnings Per Share of Common Stock (Detail) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Summary Of Earnings Per Share Of Common Stock [Abstract]
Net income attributable to Tenneco Inc.	$21	$78	$81	$46	$54	$12	$63	$54	$226	$183	$275
Average shares of common stock outstanding									60,734,022	60,474,492	59,985,677
Earnings per average share of common stock (in dollars per share)	$0.34	$1.29	$1.34	$0.76	$0.90	$0.19	$1.04	$0.90	$3.72	$3.03	$4.58
Effect of dilutive securities:
Restricted stock									130,732	205,020	140,609
Stock options									917,754	914,550	957,224
Average shares of common stock outstanding including dilutive securities									61,782,508	61,594,062	61,083,510
Diluted earnings per share of common stock (in dollars per share)	$0.33	$1.27	$1.32	$0.75	$0.88	$0.19	$1.02	$0.88	$3.66	$2.97	$4.50

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Earnings Per Share Additional Information [Abstract]
Anti-dilutive stock options	1,357	205,104	521,249

Acquisitions_Additional_Inform

Acquisitions -Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended			1 Months Ended		3 Months Ended	1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2011	Dec. 31, 2013	Dec. 31, 2014	Sep. 30, 2012	31-May-14
Business Acquisition [Line Items]
Noncontrolling Interest, Increase from Sale of Parent Equity Interest	$1	$0	$68	$0
Clear Air Joint Venture in Thailand
Business Acquisition [Line Items]
Equity ownership percentage before additional acquisition					75.00%
Equity ownership percentage after additional acquisition					100.00%
TTEC
Business Acquisition [Line Items]
Additional equity interest purchased in joint venture		20.00%					20.00%
Payment to acquire additional interest in joint venture						9	69
Intellectual Property Rights | Emission Control Systems And Products
Business Acquisition [Line Items]
Acquired certain rights from Combustion Components Associates Inc								7
CHINA
Business Acquisition [Line Items]
Buisness Sale Percentage of Voting Interest Sold									45.00%
Proceeds from Sale of Equity Method Investments									$4
Equity Ownership Percentage after Additional Sale									55.00%
Equity Ownership Percentage Before Additional Sale									100.00%

Acquisitions_Transfers_to_Nonc

Acquisitions -Transfers to Noncontrolling Interest (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Combinations [Abstract]
Net income attributable to Tenneco Inc.	$21	$78	$81	$46	$54	$12	$63	$54	$226	$183	$275
Decrease in equity for purchase of noncontrolling equity interest				-1					0	-68	0
Net income attributable to Tenneco Inc. shareholders less purchase of noncontrolling equity interest									$226	$115	$275

Restructuring_and_Other_Charge2

Restructuring and Other Charges - Additional Information (Detail) (USD $)	12 Months Ended		3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	$49	$78
Non- cash charges	5	3
Restructuring and related cost allowed to be excluded from the calculation of financial covenant ratios	150
Effect on Future Cash Flows, Amount		60
European Ride Control Business
Restructuring Cost and Reserve [Line Items]
Non-cash impairment charge			7
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	78
Vittaryd Plant Closing
Restructuring Cost and Reserve [Line Items]
Non- cash charges	3
Restructuring Charges	69
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	28	70		13
Noncash asset write downs				10
Non- cash charges				4
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	9	6
Noncash asset write downs				3
Engineering Expense
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	7	1
Other Expense
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	4	1
Reduced Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	1
Europe
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	31		120
Non- cash charges	$3

Restructuring_and_Other_Charge3

Restructuring and Other Charges - Roll Forward of Restructuring Reserve (Detail) (Employee Severance, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Employee Severance
Restructuring Reserve [Roll Forward]
December 31, 2012 Restructuring Reserve	$44
2013 Expenses	44
2013 Cash Payments	-43
Impact of Exchange Rates	-5
December 31, 2013 Restructuring Reserve	$40

Summary_of_LongTerm_Debt_Oblig

- Summary of Long-Term Debt Obligations (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]
Secured debt	$404	[1]
Long-term debt (including current maturities)	1,071		1,021
Less - maturities classified as current	2		2
Total long-term debt	1,069		1,019
Revolver Borrowings due 2017
Debt Instrument [Line Items]
Secured debt	0		58
Senior Term Loan due 2014 through 2017
Debt Instrument [Line Items]
Secured debt	0		228
OnepointNicePercentageSeniorNotesDueTwoThousandNineteen [Domain]
Debt Instrument [Line Items]
Secured debt	300
7 3/4% Senior Notes due 2018
Debt Instrument [Line Items]
Unsecured debt	0		225
Five Point Three Eight Senior Notes Due Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Unsecured debt	225
6 7/8% Senior Notes due 2020
Debt Instrument [Line Items]
Unsecured debt	500		500
Debentures due 2014 through 2026
Debt Instrument [Line Items]
Unsecured debt	1		1
CHINA
Debt Instrument [Line Items]
Secured debt	37
Notes due 2015 through 2026
Debt Instrument [Line Items]
Unsecured debt	$8		$9
[1]	We generally are required to pay commitment fees on the unused portion of the total commitment.

Summary_of_LongTerm_Debt_Oblig1

- Summary of Long-Term Debt Obligations (Parenthetical) (Detail)	Dec. 31, 2014	Dec. 31, 2013
Revolver Borrowings due 2017
Debt Instrument [Line Items]
Average effective interest rate	2.70%	2.70%
Senior Term Loan due 2014 through 2017
Debt Instrument [Line Items]
Average effective interest rate	2.70%	2.70%
7 3/4% Senior Notes due 2018
Debt Instrument [Line Items]
Stated interest rate	7.75%	7.75%
6 7/8% Senior Notes due 2020
Debt Instrument [Line Items]
Stated interest rate	6.88%	6.88%
Debentures due 2013 through 2025
Debt Instrument [Line Items]
Average effective interest rate	7.50%	7.50%
CHINA
Debt Instrument [Line Items]
Average effective interest rate	5.45%	0.00%
Notes due 2013 through 2025
Debt Instrument [Line Items]
Average effective interest rate	1.30%	1.30%

Additional_Information_Detail

-Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended				1 Months Ended
	Dec. 31, 2013	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2012	Mar. 31, 2012	Feb. 28, 2014	Mar. 22, 2012	Apr. 06, 2012	Mar. 08, 2012
Long Term Debt And Other Financing Arrangement [Line Items]
Maturities and sinking fund requirement applicable to long term debt 2014		$16,000,000
Maturities and sinking fund requirement applicable to long term debt 2015		16,000,000
Maturities and sinking fund requirement applicable to long term debt 2016		24,000,000
Maturities and sinking fund requirement applicable to long term debt 2017		31,000,000
Maturities and sinking fund requirement applicable to long term debt 2018		255,000,000
Maximum percentage of stock of certain first-tier foreign subsidiaries pledged to secure senior credit facility		66.00%
Long-term Debt, Maturities, Excluded Repayments of Principal in Next Twelve Months, Intent and Ability to Refinance		15,000,000
Unused borrowing capacity		1,214,000,000	[1]
Line of credit facility letters of credit outstanding		34,000,000	[1],[2]
Leverage ratio required (maximum) through March 22, 2017	3.5
Interest coverage required (minimum) through December 31, 2013		2.75
Debt Instrument, Redemption Price, Percentage		100.00%
Percent of the principal amount thereof plus accrued and unpaid interest		101.00%
Minimum
Long Term Debt And Other Financing Arrangement [Line Items]
Senior notes indentures minimum required fixed charge coverage ratio prior to incurring certain types of indebtedness		2
North America [Member]
Long Term Debt And Other Financing Arrangement [Line Items]
North American Program maximum facility size		110,000,000
Additional financing from second priority facility		40,000,000
Outstanding third party investments in securitized accounts receivable bank program	10,000,000			10,000,000
Interest expense recognized from securitization of receivables		2,000,000		3,000,000
Europe
Long Term Debt And Other Financing Arrangement [Line Items]
Outstanding third party investments in securitized accounts receivable bank program	134,000,000	153,000,000		134,000,000
Term of Commitments		1 year
Bank facility cancellation notification		90 days
Loss on sale of trade accounts receivable		-4,000,000
Financing Cost Related To Sale Of Securitized Receivables		2.00%		3.00%	3.00%
Expiration of Former Revolving Credit Agreement due 2014
Long Term Debt And Other Financing Arrangement [Line Items]
Line of credit facility, maximum borrowing capacity									850,000,000
Expiration Of Tranche B Term Facility
Long Term Debt And Other Financing Arrangement [Line Items]
Line of credit facility, maximum borrowing capacity									213,000,000
8 1/8 Percent Senior Notes due in 2015
Long Term Debt And Other Financing Arrangement [Line Items]
Senior note rate											7.75%
Amount of debt offered for exchange by the company											225,000,000
Amount of debt tendered for exchange by the holders									181,000,000
Debt instrument redemption price as percentage of principal amount prior quarter									104.35%
Amount of debt tendered for exchange by the holders on April 6, 2012						44,000,000
Debt instrument redemption price as percentage of principal amount current quarter										103.88%
Expenses related to redemption							13,000,000
Revolving Credit Facility
Long Term Debt And Other Financing Arrangement [Line Items]
Line of credit facility, maximum borrowing capacity		1,200,000,000									1,200,000,000
Line of credit facility, maturity date		8-Dec-19
Unused borrowing capacity		1,166,000,000
Tranche A Term Facility due March 22, 2017
Long Term Debt And Other Financing Arrangement [Line Items]
Line of credit facility, maximum borrowing capacity		300,000,000									300,000,000
Line of credit facility, maturity date		8-Dec-19
Tranche A Term Facility due March 22, 2017 | London Interbank Offered Rate (LIBOR)
Long Term Debt And Other Financing Arrangement [Line Items]
Basis spread on variable rate		175.00%
Tranche A Term Facility due March 22, 2017 | London Interbank Offered Rate (LIBOR) | Initial Spread
Long Term Debt And Other Financing Arrangement [Line Items]
Basis spread on variable rate		100.00%
Tranche A Term Facility due March 22, 2017 | London Interbank Offered Rate (LIBOR) | Ending Spread
Long Term Debt And Other Financing Arrangement [Line Items]
Basis spread on variable rate		75.00%
Tranche A Term Facility due March 22, 2017 | JP Morgan Chase Prime Rate
Long Term Debt And Other Financing Arrangement [Line Items]
Basis spread on variable rate		75.00%
Tranche A Term Facility due March 22, 2017 | Federal Funds Effective Rate | Initial Spread
Long Term Debt And Other Financing Arrangement [Line Items]
Basis spread on variable rate		50.00%
Tranche A Term Facility due March 22, 2017 | Federal Funds Effective Rate | Ending Spread
Long Term Debt And Other Financing Arrangement [Line Items]
Basis spread on variable rate		75.00%
Tranche A Term Facility due March 22, 2017 | June 30, 2014 through March 31, 2015
Long Term Debt And Other Financing Arrangement [Line Items]
Repayment of term loan		3,750,000
Tranche A Term Facility due March 22, 2017 | June 30, 2015 through March 31, 2016
Long Term Debt And Other Financing Arrangement [Line Items]
Repayment of term loan		5,625,000
Tranche A Term Facility due March 22, 2017 | June 30, 2016 through December 31, 2016
Long Term Debt And Other Financing Arrangement [Line Items]
Repayment of term loan		7,500,000
Tranche A Term Facility due March 22, 2017 | Due on March 22, 2017
Long Term Debt And Other Financing Arrangement [Line Items]
Repayment of term loan		195,000,000
Letter of Credit
Long Term Debt And Other Financing Arrangement [Line Items]
Line of credit facility letters of credit outstanding		34,000,000
7 3/4 Percent Senior Notes due August 15, 2018
Long Term Debt And Other Financing Arrangement [Line Items]
Unsecured debt		225,000,000
6 7/8 Percent Senior Notes due Dec 15, 2020
Long Term Debt And Other Financing Arrangement [Line Items]
Unsecured debt		500,000,000
Other Debt
Long Term Debt And Other Financing Arrangement [Line Items]
Unsecured debt		$104,000,000
Senior Credit Facility
Long Term Debt And Other Financing Arrangement [Line Items]
Borrowings reduced in basis points to applicable margin, resulting from senior secured leverage ratio below minimum		0.0025
Increase (decrease) in basis points to applicable margin, resulting from senior secured leverage ratio below minimum		0.50%						-0.25%
Commitment fee basis points		0.30%
Senior Credit Facility | Minimum
Long Term Debt And Other Financing Arrangement [Line Items]
Senior secured leverage ratio		2.25
Senior Credit Facility | Maximum
Long Term Debt And Other Financing Arrangement [Line Items]
Senior secured leverage ratio		3.25
commitment fee [Domain]
Long Term Debt And Other Financing Arrangement [Line Items]
Increase (decrease) in basis points to applicable margin, resulting from senior secured leverage ratio below minimum		0.40%
[1]	We generally are required to pay commitment fees on the unused portion of the total commitment.
[2]	Letters of credit reduce the available borrowings under the revolving credit agreement.

ShortTerm_Debt_Detail

- Short-Term Debt (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Disclosure Short Term Debt [Abstract]
Maturities classified as current	$2	$2
Short-term borrowings	58	81
Total short-term debt	$60	$83

Notes_Payable_Detail

- Notes Payable (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Short-term Debt [Line Items]
Outstanding borrowings at end of year	$58		$81
Notes Payable Current
Short-term Debt [Line Items]
Outstanding borrowings at end of year	58	[1]	81	[1]
Weighted average interest rate on outstanding borrowings at end of year(b)	2.60%	[1],[2]	4.40%	[1],[2]
Approximate maximum month-end outstanding borrowings during year	124	[1]	177	[1]
Approximate average month-end outstanding borrowings during year	$107	[1]	$116	[1]
Weighted average interest rate on average month-end outstanding borrowings during year(b)	4.00%	[1],[2]	4.70%	[1],[2]
[1]	Includes borrowings under both committed credit facilities and uncommitted lines of credit and similar arrangements.
[2]	This calculation does not include the commitment fees to be paid on the unused revolving credit facility balances which are recorded as interest expense for accounting purposes.

Financing_Arrangements_Detail

- Financing Arrangements (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$1,069		$1,019
Committed Credit Facilities, Commitments	1,652	[1]
Committed Credit Facilities, Borrowings	404	[1]
Committed Credit Facilities, Letter of Credit	34	[1],[2]
Committed Credit Facilities, Available	1,214	[1]
Tenneco Inc. revolving credit agreement
Debt Instrument [Line Items]
Committed Credit Facilities, Term	2019	[1]
Committed Credit Facilities, Commitments	1,200	[1]
Committed Credit Facilities, Borrowings	0	[1]
Committed Credit Facilities, Letter of Credit	34	[1],[2]
Committed Credit Facilities, Available	1,166	[1]
Tranche A Term Facility
Debt Instrument [Line Items]
Committed Credit Facilities, Term	2019	[1]
Committed Credit Facilities, Commitments	300	[1]
Committed Credit Facilities, Borrowings	300	[1]
Notes due 2015 through 2026
Debt Instrument [Line Items]
Unsecured Debt	8		9
Subsidiaries' credit agreements
Debt Instrument [Line Items]
Committed Credit Facilities, Commitments	152	[1]
Committed Credit Facilities, Borrowings	104	[1]
Committed Credit Facilities, Available	$48	[1]
Subsidiaries' credit agreements | Minimum
Debt Instrument [Line Items]
Committed Credit Facilities, Term	2015	[1]
Subsidiaries' credit agreements | Maximum
Debt Instrument [Line Items]
Committed Credit Facilities, Term	2026	[1]
[1]	We generally are required to pay commitment fees on the unused portion of the total commitment.
[2]	Letters of credit reduce the available borrowings under the revolving credit agreement.

Financial_Ratios_Under_Senior_

- Financial Ratios Under Senior Credit Facility (Detail)	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Required
Debt Instrument [Line Items]
Leverage Ratio (maximum)	3.5	3.5	3.5	3.5
Interest Coverage Ratio (minimum)	2.75	2.75	2.75	3.75
Actual
Debt Instrument [Line Items]
Leverage Ratio (maximum)	1.63	1.57	1.55	1.22
Interest Coverage Ratio (minimum)	10.39	10.62	10.99	11.4

Proforma_Consolidated_Leverage

- Proforma Consolidated Leverage Ratio (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Greater than or equal to 3.0x
Line of Credit Facility [Line Items]
Maximum aggregate principal amount of purchases, cancellations and redemptions of senior notes	20
Greater than or equal to 2.5x
Line of Credit Facility [Line Items]
Maximum aggregate principal amount of purchases, cancellations and redemptions of senior notes	100
Greater than or equal to 2.0x
Line of Credit Facility [Line Items]
Maximum aggregate principal amount of purchases, cancellations and redemptions of senior notes	200
Less than 2.0x
Line of Credit Facility [Line Items]
Less than 2.0x	no limit
Europe
Line of Credit Facility [Line Items]
Financing Cost Related To Sale Of Securitized Receivables	2.00%	3.00%	3.00%

Carrying_and_Estimated_Fair_Va

- Carrying and Estimated Fair Value (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including current maturities)	$1,071	$1,021
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including current maturities)	1,071	1,021
Derivative Asset, Fair Value, Gross Asset	0	0
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including current maturities)	1,106	1,089
Derivative Asset, Fair Value, Gross Asset	$0	$0

Financial_Instruments_Addition

- Financial Instruments - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2012
			Agreement
Financial Instruments [Line Items]
Maximum percentage of stock of certain first tier foreign subsidiaries pledged to secure senior credit facility	66.00%
Line of credit facility letters of credit outstanding	$35
Negotiable financial instruments collected before maturity date and sold at discount	1	5
Negotiable financial instruments not redeemed and used for vendor payment classified as notes payable	24	13
Negotiable financial instruments received from OE customer not redeemed	17	12
Negotiable financial instruments received classified as other current assets	17	12
Supply chain financing extended payment amount	16
AUSTRALIA
Financial Instruments [Line Items]
Number of Subsidiaries	2
Restricted cash	3
Fair Value, Inputs, Level 1
Financial Instruments [Line Items]
Fair value of long term debt	759	792
Fair Value, Inputs, Level 2
Financial Instruments [Line Items]
Fair value of long term debt	301	287
Fair Value, Inputs, Level 3
Financial Instruments [Line Items]
Fair value of long term debt	46	10
TMEL and Walker Plans
Financial Instruments [Line Items]
Number of performance guarantee agreements			2
Number of group benefit plans under the agreement			2
Maximum amount payable for pension performance guarantees	55
Percentage of liability considered to determine maximum amount payable for pension performance guarantees	105.00%
Percentage of the pension obligation recognized for participating employers	100.00%
Pension obligation of participating employers recognized on the balance sheet	17	10
TMEL and Futaba
Financial Instruments [Line Items]
Maximum amount reimbursable under indemnity agreement	$9

Foreign_Exchange_Forward_Contr

- Foreign Exchange Forward Contracts Fair Value on Gross Basis (Detail) (Foreign Exchange Forward, USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Long [Member] | Australia, Dollars
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$3
Long [Member] | United Kingdom, Pounds
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1
Long [Member] | Euro Member Countries, Euro
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	-1
Long [Member] | South Africa, Rand
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	112
Long [Member] | United States of America, Dollars
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	14
Short [Member] | Canada, Dollars
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2
Short [Member] | Euro Member Countries, Euro
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4
Short [Member] | Japan, Yen
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	-1,268
Short [Member] | United States of America, Dollars
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$10

Summarization_for_Foreign_Curr

- Summarization for Foreign Currency Forward Purchase and Sale Contracts (Detail) (Foreign Exchange Forward, USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Long [Member] | Australia, Dollars
Notional Amount in Foreign Currency	($3)
Long [Member] | United Kingdom, Pounds
Notional Amount in Foreign Currency	-1
Long [Member] | Euro Member Countries, Euro
Notional Amount in Foreign Currency	1
Long [Member] | South Africa, Rand
Notional Amount in Foreign Currency	-112
Long [Member] | United States of America, Dollars
Notional Amount in Foreign Currency	-14
Short [Member] | Canada, Dollars
Notional Amount in Foreign Currency	-2
Short [Member] | Euro Member Countries, Euro
Notional Amount in Foreign Currency	-4
Short [Member] | Japan, Yen
Notional Amount in Foreign Currency	1,268
Short [Member] | United States of America, Dollars
Notional Amount in Foreign Currency	($10)

Income_before_income_taxes_and

- Income before income taxes and noncontrolling interests (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Income Before Income Taxes And Noncontrolling Interests [Abstract]
U.S. income before income taxes	$130	$150	$166
Foreign income before income taxes	271	194	157
Earnings before income taxes and noncontrolling interests	$401	$344	$323

Comparative_Analysis_of_Compon

- Comparative Analysis of Components of Income Tax Expense (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
U.S. federal	$38	$25	$0
State and local	3	4	4
Foreign	92	81	89
Total current income tax expenses	133	110	93
Deferred
U.S. federal	2	-4	-25
State and local	7	2	-20
Foreign	-11	14	-29
Total deferred income tax expenses	-2	12	-74
Income tax expense	$131	$122	$19

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
U.S. Federal statutory rate	35.00%
Reducing in tax loss carryforward due to realization domestic and state tax loss	$6	$4
Valuation allowance	139	135
Income tax expense (benefit)	131	122	19
Impact on earnings related to reversal of valuation allowance	11
Unremitted earnings of foreign subsidiaries	737
Estimated income tax liability related to unremitted earnings of foreign subsidiaries	121
Uncertain tax positions that would affect the effective tax rate if recognized	101	107	101
Liability for interest on unrecognized tax benefits	6	7	5
Estimated decrease in unrecognized tax benefits related to the expiration of foreign statute of limitations and the conclusion of foreign income tax examinations that may occur within the coming year	30
Maximum
Schedule of Equity Method Investments [Line Items]
Penalties accrued	1	1	1
Liability for penalties on unrecognized tax benefits	2	2	3
Accrued interest related to uncertain tax positions	1	2	2
Spain
Schedule of Equity Method Investments [Line Items]
Impact on earnings related to reversal of valuation allowance	$19

Reconciliation_of_Income_Taxes

- Reconciliation of Income Taxes Computed at Statutory U.S. Federal Income Tax Rate to Income Tax Expense (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Reconciliation Of Income Taxes Computed At Statutory U S Federal Income Tax Rate To Income Tax Expense [Abstract]
Income tax expense computed at the statutory U.S. federal income tax rate	$140	$120	$113
Foreign income taxed at different rates	-21	-21	-21
Taxes on repatriation of dividends	4	9	8
Remeasurement of estimated tax on unremitted earnings	0	-17	0
State and local taxes on income, net of U.S. federal income tax benefit	8	6	4
Changes in valuation allowance for tax loss carryforwards and credits	12	27	-91
Foreign tax holidays	-6	-5	-5
Investment and R&D tax credits	-10	-8	-1
Foreign earnings subject to U.S. federal income tax	7	5	23
Adjustment of prior years taxes	-2	-1	-5
Impact of foreign tax law changes	0	-3	-1
Tax contingencies	0	6	-6
Other	-1	4	1
Income tax expense	$131	$122	$19

Components_of_Our_Net_Deferred

- Components of Our Net Deferred Tax Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Disclosure Components Of Our Net Deferred Tax Assets [Abstract]
U.S. federal	$0	$0
State	15	23
Foreign	75	78
Tax credit benefits	86	88
Postretirement benefits other than pensions	55	43
Pensions	56	36
Bad debts	2	1
Sales allowances	7	6
Payroll and other accruals	155	132
Valuation allowance	-139	-135
Total deferred tax assets	312	272
Tax over book depreciation	51	56
Other	59	51
Total deferred tax liabilities	110	107
Net deferred tax assets	$202	$165

Reconciliation_of_Deferred_Tax

- Reconciliation of Deferred Taxes to Deferred Taxes Shown In Balance Sheet (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Reconciliation Of Deferred Taxes To Deferred Taxes Shown In Balance Sheet [Abstract]
Reducing in Tax Loss Carryforward Due To Realization Foreign Tax Loss	$12	$6
Valuation allowance	139	135
Balance Sheet:
Current portion - deferred tax asset	81	71
Non-current portion - deferred tax asset	143	125
Current portion - deferred tax liability shown in other current liabilities	-4	-3
Non-current portion - deferred tax liability	-18	-28
Net deferred tax assets	202	165
Income tax expense	131	122	19
Impact on earnings related to reversal of valuation allowance	$11

Reconciliation_of_our_Uncertai

- Reconciliation of our Uncertain Tax Positions (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Uncertain tax positions -
Balance January 1	$115	$107	$119
Gross increases in tax positions in current period	8	15	13
Gross increases in tax positions in prior period	5	0	1
Gross decreases in tax positions in prior period	-5	-1	-12
Gross decreases - settlements	-2	0	-5
Gross decreases - statute of limitations expired	-7	-6	-9
Balance December 31	$114	$115	$107

Tax_Years_Open_to_Examination_

- Tax Years Open to Examination in Primary Jurisdictions (Detail)	12 Months Ended
	Dec. 31, 2014
United States - due to NOL
Income Tax Contingency [Line Items]
Tax years open to examination in primary jurisdictions	2000
CHINA
Income Tax Contingency [Line Items]
Tax years open to examination in primary jurisdictions	2004
Spain
Income Tax Contingency [Line Items]
Tax years open to examination in primary jurisdictions	2003
Canada
Income Tax Contingency [Line Items]
Tax years open to examination in primary jurisdictions	2011
Brazil
Income Tax Contingency [Line Items]
Tax years open to examination in primary jurisdictions	2010
Mexico
Income Tax Contingency [Line Items]
Tax years open to examination in primary jurisdictions	2009
Belgium
Income Tax Contingency [Line Items]
Tax years open to examination in primary jurisdictions	2012
Germany
Income Tax Contingency [Line Items]
Tax years open to examination in primary jurisdictions	2010
United Kingdom
Income Tax Contingency [Line Items]
Tax years open to examination in primary jurisdictions	2012

Common_Stock_Additional_Inform

Common Stock - Additional Information (Detail) (USD $)	1 Months Ended			3 Months Ended					12 Months Ended
In Millions, except Share data, unless otherwise specified	31-May-14	Jan. 31, 2013	Dec. 31, 1999	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2014	Jan. 31, 2012	Dec. 31, 2011	Jan. 31, 2015	Mar. 12, 2002	15-May-13	13-May-09
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number				1,454,003	2,073,185	2,086,770	2,119,003		1,454,003	1,983,573
Authorized common stock available for issuance under the plan				135,000,000					135,000,000
Common stock, par value				$0.01					$0.01
Common stock, shares issued				64,454,248					64,454,248	63,714,728
Treasury stock shares				3,244,692					3,244,692	2,844,692	2,294,692			1,694,692
Term for stock options			3 years						5 years 0 months 0 days	4 years 10 months 24 days	4 years 8 months 12 days
Restriction period for restricted common stock			3 years
Decrease in basic earnings per share									($0.06)	($0.10)
Increase Decrease In Earnings Per Share Diluted										($0.09)	($0.08)
Decrease in basic and diluted earnings per share											($0.09)
Share based compensation									$13	$13	$11
Weighted average grant-date fair value of options granted									$26.48	$19.91	$17.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				971,689					971,689
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value				28					28
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price				$25.37					$25.37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term									4 years 6 months 0 days
Total Intrinsic value of options exercised				24	0	1	1		30	19	10
Total fair value of shares vested									6	5	4
Weighted average grant-date fair value of restricted stock granted									$55.26	$36.40	$30.06
Total fair value of restricted shares vested									8	6	5
Number of shares authorized to be repurchased		550,000										400,000
Stock repurchased during period								600,000
Payments for Repurchase of Common Stock								18	22	27	18
2012 authorized outstanding common stock for repurchase over a 12 month period													600,000
Average price of share repurchase program								$29.22
Stock repurchased during the period	22	27
Treasury stock average cost per share	$56.06	$49.33
Future Stock Repurchases Program
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of shares authorized to be repurchased															350,000,000
Stock Appreciation Rights (SARs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restriction period for restricted common stock									3 years
Stock Option
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense related to nonqualified stock options									3	6	5
Unrecognized compensation costs				5					5
Unrecognized compensation costs, weighted average period									0 years 10 months 24 days
Cash received from stock option exercises									10	15	7
Unrecorded Tax Benefit From Stock Options Exercised									12	6	10
Employee Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options									26
Restricted stock, restricted stock units, long term performance units, SARs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized compensation costs				14					14
Unrecognized compensation costs, weighted average period									1 year 7 months 6 days
Share based compensation									13	17	16
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized compensation costs				5					5
Unrecognized compensation costs, weighted average period									1 year 8 months 12 days
Weighted average grant-date fair value of restricted stock granted				$0	$67.02	$66.96	$54.90
Supplemental Stock Ownership Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Authorized treasury shares available for purchase under the supplemental stock ownership plan			1,100,000
2002 Long-Term Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Authorized common stock available for issuance under the plan																4,000,000
2006 Long-Term Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Authorized common stock available for issuance under the plan																	3,500,000	2,300,000
Count of each share from a stock option award against shares available for issuance under the plan																		1
Count of each share from a full value award against shares available for issuance under the plan																	1.49	1.25
Shares of common stock remain authorized for delivery				3,610,571					3,610,571
United States | Stock Option
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cash received from stock option exercises										24
United States | Employee Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options									14
2013 [Domain]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Treasury stock shares											2,294,692
2014 [Domain]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Treasury stock shares										2,844,692
Less - Common Stock Held as Treasury Stock, at Cost
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock repurchased during period									400,000	550,000	600,000
Stock repurchased during the period									$22	$27	$18
Less - Common Stock Held as Treasury Stock, at Cost | Open Market [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock repurchased during period	400,000	450,000
Less - Common Stock Held as Treasury Stock, at Cost | Tenneco Retirement Plan for Salaried Employees [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock repurchased during period		100,000
Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Term for stock options			20 years
Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Term for stock options			7 years
2012 Through 2014 [Member] | Performance Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restriction period for restricted common stock									3 years
2013 Through 2015 [Member] | Performance Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restriction period for restricted common stock									3 years
2014 Through 2016 [Member] | Performance Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restriction period for restricted common stock									3 years

Assumptions_Used_for_Calculati

Assumptions Used for Calculating Fair Values of Stock Option Awards (Detail) (USD $)	1 Months Ended	12 Months Ended
	Dec. 31, 1999	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options Granted
Weighted average grant date fair value, per share		$26.46	$19.84	$17.35
Weighted average assumptions used:
Expected volatility		52.80%	66.40%	73.50%
Expected lives	3 years	5 years 0 months 0 days	4 years 10 months 24 days	4 years 8 months 12 days
Risk-free interest rates		1.70%	0.70%	0.80%
Dividends yields		0.00%	0.00%	0.00%

Stock_Options_Status_and_Activ

Stock Options Status and Activity (Detail) (USD $)	3 Months Ended				12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Stock Options [Line Items]
Increase Decrease In Earnings Per Share Diluted						($0.09)	($0.08)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Under Option Outstanding Beginning Balance	2,073,185	2,086,770	2,119,003	1,983,573	1,983,573
Shares Under Option, Granted	0	834	0	192,624
Share Under Option, Canceled	0	-526		-31,299
Shares Under Option, Forfeited	-12,182	-1,535	0	-300
Shares Under Option, Exercised	-607,000	-12,358	-32,233	-25,595
Shares Under Option Outstanding Ending Balance	1,454,003	2,073,185	2,086,770	2,119,003	1,454,003	1,983,573
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Prices, Outstanding, Beginning Balance	$26.13	$26.11	$26.10	$22.93	$22.93
Weighted Average Exercise Prices, Granted	$0	$66.54	$0	$56.23
Weighted Average Exercise Price, Canceled	$0	$36		$19.78
Weighted Average Exercise Prices, Forfeited	$47.36	$29.72	$0	$22.77
Weighted Average Exercise Prices, Exercised	$13.66	$23.81	$25.49	$14.72
Weighted Average Exercise Prices, Outstanding, Ending Balance	$31.16	$26.13	$26.11	$26.10	$31.16	$22.93
Weighted Average Remaining Life in Years	4 years 4 months 24 days	4 years 1 month 5 days	4 years 3 months 17 days	4 years 7 months 5 days		4 years 6 months 0 days
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$77	$75	$67	$62	$62
Aggregate Intrinsic Value, Exercised	24	0	1	1	30	19	10
Aggregate Intrinsic Value, Outstanding, Ending Balance	33	77	75	67	33	62
Stock Option
Schedule Of Stock Options [Line Items]
Unrecorded Tax Benefit From Stock Options Exercised					$12	$6	$10

Nonvested_Restricted_Shares_De

Nonvested Restricted Shares (Detail) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Granted	$55.26	$36.40	$30.06
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested Restricted Shares, Beginning Balance	368,268			304,190	313,694	313,717	368,268
Nonvested Restricted Shares, Granted				0	1,160	2,838	131,561
Restricted Shares, Vested				-11,040	-10,664	-2,286	-186,112
Nonvested Restricted Shares, Forfeited				-7,099	0	-575	0
Nonvested Restricted Shares, Ending Balance	286,051			286,051	304,190	313,694	313,717
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period	$34.90			$42.25	$42.60	$42.30	$34.90
Granted				$0	$67.02	$66.96	$54.90
Vested				$36.37	$55.36	$31.63	$36.57
Forfeited				$47,370,000	$0	$38.52	$0
Nonvested, Weighted Average Grant Date Fair Value, End of Period	$42.35			$42.35	$42.25	$42.60	$42.30

Preferred_Stock_Additional_Inf

Preferred Stock - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Preferred Stock [Line Items]
Authorized shares	50,000,000	50,000,000
Par value	$0.01	$0.01
Outstanding shares	0	0

Pension_Plans_Postretirement_a2

Pension Plans Postretirement and Other Employee Benefits - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Jan. 02, 2012	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014
	retirement_plan	retiree
Pension and Other Postretirement Benefits Disclosure [Line Items]
Pension benefit obligations		$931	$931
Pension benefit obligations with funding requirements		879	879
Pension Fund assets available to fund pension benefit obligations		726	726
Pension benefit obligations with no funding requirements		52	52
Acceptable tolerance limit of investment allocations for securities			5.00%
Employer contributions			46
Expected contributions in 2013			31
Minimum retirement age for eligible employees of the post retirement plans			55 years
Minimum years of service for eligible employees of the post retirement plans			10 years
Prior period correction		11
Defined Benefit Plan, Prior Period Adjustment, Number of Retirees Entitled to Benefits Not Included		170
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate			6.50%	7.00%	7.50%
Defined Benefit Plan Ultimate Health Care Cost Year Five			4.50%	4.50%	4.50%
Retirement Savings Plan	1
Maximum percentage of salary deferral allowed under the Employee Stock Ownership Plans		75.00%	75.00%
Defined Compensation Plan, Amended Employee Match Percentage on One Hundred Percent of Employee Contributions			3.00%
Defined Compensation Plan, Amended Employee Match Percentage on Fifty Percent of Employee Contributions			50.00%
Expense recorded relating to employee matching contribution			25	23	21
Maximum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Compensation Plan, Amended Employee Match Percentage on Fifty Percent of Employee Contributions			5.00%
Postretirement
Pension and Other Postretirement Benefits Disclosure [Line Items]
Employer contributions			8	8
Percent of eligible employees who participated in voluntary buyout, more than						60.00%
Prior period correction			15
One percentage point increase effect on postretirement benefit obligation			15
One percentage point decrease effect on postretirement benefit obligation			12
Postretirement | Maximum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined benefit plan effect of one percentage point increase on service and interest cost components			1
Defined benefit plan effect of one percentage point decrease on service and interest cost components			1
Pension Plans, Defined Benefit
Pension and Other Postretirement Benefits Disclosure [Line Items]
Expected contributions in 2013			$9
Equity Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Targeted pension plan allocations in debt securities			70.00%
Debt Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Targeted pension plan allocations in debt securities			30.00%
Postretirement | Minimum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Compensation Plan, Amended Employee Match Percentage on One Hundred Percent of Employee Contributions			100.00%
Defined Compensation Plan, Amended Employee Match Percentage on Fifty Percent of Employee Contributions			3.00%

Pension_Plan_Assets_Classes_of

Pension Plan Assets Classes of Securities (Detail)	Dec. 31, 2014	Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefits | Equity Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	70.00%	71.00%
United States Pension Plans of US Entity, Defined Benefits | Debt Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	30.00%	29.00%
United States Pension Plans of US Entity, Defined Benefits | All Other
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities		0.00%
Foreign | Equity Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	60.00%	62.00%
Foreign | Debt Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	32.00%	31.00%
Foreign | Real Estate
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	4.00%	2.00%
Foreign | All Other
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	4.00%	5.00%

Plan_Assets_Using_Fair_Value_H

Plan Assets Using Fair Value Hierarchy (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$726
United States Pension Plans of US Entity, Defined Benefits | Fair Value, Inputs, Level 1
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	43	41
United States Pension Plans of US Entity, Defined Benefits | Fair Value, Inputs, Level 1 | U.S. large cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	41	41
United States Pension Plans of US Entity, Defined Benefits | Fair Value, Inputs, Level 1 | Cash held in bank accounts
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2	0
United States Pension Plans of US Entity, Defined Benefits | Fair Value, Inputs, Level 2
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	291	306
United States Pension Plans of US Entity, Defined Benefits | Fair Value, Inputs, Level 2 | U.S. large cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	134	143
United States Pension Plans of US Entity, Defined Benefits | Fair Value, Inputs, Level 2 | U.S. Small Cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	25	27
United States Pension Plans of US Entity, Defined Benefits | Fair Value, Inputs, Level 2 | Non-U.S. mid cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	24	27
United States Pension Plans of US Entity, Defined Benefits | Fair Value, Inputs, Level 2 | Emerging Markets
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8	8
United States Pension Plans of US Entity, Defined Benefits | Fair Value, Inputs, Level 2 | U.S. corporate bonds
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5	5
United States Pension Plans of US Entity, Defined Benefits | Fair Value, Inputs, Level 2 | U.S. other fixed income
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	95	96
Foreign | Fair Value, Inputs, Level 1
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	180	175
Foreign | Fair Value, Inputs, Level 1 | U.S. large cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	31	31
Foreign | Fair Value, Inputs, Level 1 | U.S. mid cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4	4
Foreign | Fair Value, Inputs, Level 1 | Non-U.S. large cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	57	57
Foreign | Fair Value, Inputs, Level 1 | Non-U.S. mid cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	20	20
Foreign | Fair Value, Inputs, Level 1 | Non-U.S. small cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1	1
Foreign | Fair Value, Inputs, Level 1 | Emerging Markets
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Foreign | Fair Value, Inputs, Level 1 | Non-U.S. treasuries/government bonds
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	41	35
Foreign | Fair Value, Inputs, Level 1 | Non-U.S. corporate bonds
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	20	18
Foreign | Fair Value, Inputs, Level 1 | Non-U.S. municipal obligations
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1	1
Foreign | Fair Value, Inputs, Level 1 | Non-U.S. other fixed income
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1	1
Foreign | Fair Value, Inputs, Level 1 | Non-U.S. real estate
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	1
Foreign | Fair Value, Inputs, Level 1 | Cash held in bank accounts
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4	6
Foreign | Fair Value, Inputs, Level 2
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	203	196
Foreign | Fair Value, Inputs, Level 2 | U.S. large cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	25	21
Foreign | Fair Value, Inputs, Level 2 | U.S. mid cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5	4
Foreign | Fair Value, Inputs, Level 2 | U.S. Small Cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0
Foreign | Fair Value, Inputs, Level 2 | Non-U.S. large cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	68	71
Foreign | Fair Value, Inputs, Level 2 | Non-U.S. mid cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	16	19
Foreign | Fair Value, Inputs, Level 2 | Non-U.S. small cap
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	6	7
Foreign | Fair Value, Inputs, Level 2 | Emerging Markets
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	3	4
Foreign | Fair Value, Inputs, Level 2 | U.S. corporate bonds
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5	4
Foreign | Fair Value, Inputs, Level 2 | U.S. other fixed income
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0
Foreign | Fair Value, Inputs, Level 2 | Non-U.S. treasuries/government bonds
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	27	25
Foreign | Fair Value, Inputs, Level 2 | Non-U.S. corporate bonds
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	27	18
Foreign | Fair Value, Inputs, Level 2 | Non-U.S. mortgage backed securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2	4
Foreign | Fair Value, Inputs, Level 2 | Non-U.S. asset backed securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	3
Foreign | Fair Value, Inputs, Level 2 | Non-U.S. other fixed income
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	2
Foreign | Fair Value, Inputs, Level 2 | Non-U.S. real estate
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	6	5
Foreign | Fair Value, Inputs, Level 2 | Insurance contracts
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	13	9
Foreign | Fair Value, Inputs, Level 3
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	9	8
Foreign | Fair Value, Inputs, Level 3 | Insurance contracts
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$9	$8

Changes_in_Fair_Value_of_Level

Changes in Fair Value of Level 3 Assets (Detail) (Foreign, Fair Value, Inputs, Level 3, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Foreign | Fair Value, Inputs, Level 3
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Balance at December 31 of the previous year	$8	$8
Relating to assets still held at the reporting date	1	0
Ending Balance at December 31	$9	$8

Significant_Concentrations_of_

Significant Concentrations of Risk (Detail) (Fair Value, Inputs, Level 1, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Inputs, Level 1
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Investment in Tenneco stock	$41	$41
Investment in Tenneco stock as a percentage of total plan assets	5.60%	5.60%

Summary_of_Amount_Recognised_i

Summary of Amount Recognised in Balance Sheets for Pension Plans and Postretirement Benefit Plan (Detail) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost		$6	$5	$6
Prior period correction	11
Employer contributions		46
Fair value at December 31	726	726
Actuarial loss		4	4	5
Prior service cost		-4
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	0	0	0
Noncurrent liabilities	-339	-339	-249
United States Pension Plans of US Entity, Defined Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at December 31 of the previous year		112
Interest cost		20	19	20
Benefits paid		-8	-8
Benefit obligation at December 31			112
Actuarial loss		7	9	7
Prior service cost		1	1
Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost		18	17	18
Actuarial loss		7	10	7
Prior service cost		5	7
Postretirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at December 31 of the previous year		112	131
Service cost			0
Interest cost		6	5
Actuarial (gain)/loss		18	-16
Prior period correction		15
Benefits paid		-8
Benefit obligation at December 31	143	143	112
Employer contributions		8	8
Prescription drug subsidy received			0
Unfunded status at December 31		-143	-112
Actuarial loss		53	32
Prior service cost		-10	-16
Net amount recognized at December 31	-100	-100	-96
Current liabilities	-9	-9	-8
Noncurrent liabilities	-134	-134	-104
Net amount recognized	-143	-143	-112
Pension Plans, Defined Benefit | United States Pension Plans of US Entity, Defined Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at December 31 of the previous year		421	461
Settlement		-53
Service cost		1	1
Interest cost		20	19
Actuarial (gain)/loss		77	-41
Benefits paid		-18	-19
Benefit obligation at December 31	448	448	421
Fair value at December 31 of the previous year		347	275
Settlement		-41
Actual return on plan assets		23	60
Employer contributions		23	31
Fair value at December 31	334	334	347
Unfunded status at December 31		-115	-74
Actuarial loss		230	190
Prior service cost		1	1
Net amount recognized at December 31	116	116	117
Current liabilities	-10	-10	-6
Noncurrent liabilities	-105	-105	-68
Net amount recognized	-115	-115	-74
Pension Plans, Defined Benefit | Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at December 31 of the previous year		442	431
Currency rate conversion		-41	-2
Settlement		0	-1
Curtailment		0	-1
Service cost		8	9
Interest cost		18	17
Administrative expenses/taxes paid		-2	-2
Plan amendments		0	1
Actuarial (gain)/loss		73	6
Benefits paid		-17	-18
Participants' contributions		2	2
Benefit obligation at December 31	483	483	442
Fair value at December 31 of the previous year		379	332
Currency rate conversion		-32	-3
Settlement		0	-1
Actual return on plan assets		40	43
Employer contributions		22	26
Participants' contributions		2	2
Fair value at December 31	392	392	379
Unfunded status at December 31		-90	-62
Actuarial loss		172	137
Prior service cost		5	7
Net amount recognized at December 31	87	87	82
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	8	8	11
Current liabilities	-3	-3	-2
Noncurrent liabilities	-95	-95	-71
Net amount recognized	($90)	($90)	($62)

Components_of_Net_Periodic_Ben

Components of Net Periodic Benefit Cost (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$0	$0	$1
Interest cost	6	5	6
Net amortization:
Actuarial loss	4	4	5
Prior service cost	-7	-6	-6
Prior period correction	9	0	0
Net pension costs	12	3	6
United States Pension Plans of US Entity, Defined Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	1	1	1
Interest cost	20	19	20
Expected return on plan assets	25	22	22
Settlement loss	-21	0	0
Net amortization:
Actuarial loss	7	9	7
Net pension costs	24	7	6
Foreign
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	8	9	7
Interest cost	18	17	18
Expected return on plan assets	23	20	20
Settlement loss	0	-1	-1
Net amortization:
Actuarial loss	7	10	7
Prior service cost	2	1	2
Net pension costs	$12	$18	$15

Amounts_to_be_Reflected_as_Com

Amounts to be Reflected as Component of Net Periodic Benefit Cost (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss	$5
Prior service cost	-4
Total	1
United States Pension Plans of US Entity, Defined Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss	230	190
Prior service cost	1	1
Total	231	191
Net actuarial loss	8
Prior service cost	0
Total expected amounts that will be amortized from accumulated other comprehensive income in 2013	8
Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss	172	137
Prior service cost	5	7
Total	177	144
Net actuarial loss	9
Prior service cost	1
Total expected amounts that will be amortized from accumulated other comprehensive income in 2013	$10

Amounts_Recognized_for_Pension

Amounts Recognized for Pension and Postretirement Benefits in Other Comprehensive Income (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Change in total actuarial loss, Before-tax amount	($124)	$113
Amortization of prior service cost included in net periodic pension and postretirement cost, Before-tax amount	-5	-5
Amortization of actuarial loss included in net periodic pension and postretirement cost, Before-tax amount	18	23
Other comprehensive income - pension benefits, Before-tax amount	-111	131
Change in total actuarial loss, Tax Benefit	35	-41
Amortization of prior service cost included in net periodic pension and postretirement cost, Tax Benefit	1	2
Amortization of actuarial loss included in net periodic pension and postretirement cost, Tax Benefit	-5	-7
Other comprehensive - pension benefits, Tax Benefit	31	-46
Change in total actuarial loss, Net-of-tax amount	-89	72
Amortization of prior service cost included in net periodic pension and postretirement cost, Net-of-tax Amount	-4	-3
Amortization of actuarial loss included in net periodic pension and postretirement cost, Net-of-tax Amount	13	16
Other comprehensive income - pension benefits, Net-of-tax Amount	($80)	$85	($32)

Projected_Benefit_Obligation_A

Projected Benefit Obligation Accumulated Benefit Obligation and Fair Value of Plan Assets for All Pension Plans (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
United States Pension Plans of US Entity, Defined Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	$448	$421
Accumulated benefit obligation	448	421
Fair value of plan assets	334	347
Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	349	289
Accumulated benefit obligation	344	286
Fair value of plan assets	$253	$218

Estimated_Pension_Plan_Benefit

Estimated Pension Plan Benefit Payments (Detail) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
United States Pension Plans of US Entity, Defined Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2015	$29
2016	21
2017	29
2018	22
2019	24
2020-2023	122
Foreign
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2015	18
2016	19
2017	18
2018	19
2019	22
2020-2023	$113

Weighted_Average_Assumptions_U

Weighted Average Assumptions Used to Determine Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Ultimate Health Care Cost Year Five	4.50%	4.50%	4.50%
Weighted-average assumptions used to determine benefit obligations
Discount rate	4.10%	4.80%
United States Pension Plans of US Entity, Defined Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	4.10%	4.80%
Foreign
Weighted-average assumptions used to determine benefit obligations
Discount rate	3.30%	4.30%
Rate of compensation increase	3.40%	3.30%

WeightedAverage_Assumptions_us

Weighted-Average Assumptions used to Determine Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate	4.80%	4.10%	4.80%
United States Pension Plans of US Entity, Defined Benefits
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate	4.80%	4.10%	4.80%
Expected long-term return on plan assets	7.80%	7.80%	8.30%
Foreign
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate	4.30%	4.20%	4.90%
Expected long-term return on plan assets	6.10%	6.20%	6.30%
Rate of compensation increase	3.30%	3.40%	3.50%

Amounts_to_be_Reflected_as_Com1

Amounts to be Reflected as Component of Net Periodic Cost (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Other Information	21
Net actuarial loss	$5
Prior service cost	-4
Total	$1
United States Pension Plans of US Entity, Defined Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Other Information	50

Estimated_Subsidies_Under_Medi

Estimated Subsidies Under Medicare Prescription Drug Improvement and Modernization Act (Detail) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]
2015	$9
2016	9
2017	9
2018	9
2019	9
2020-2023	$42

Assumptions_Used_to_Determine_

Assumptions Used to Determine Postretirement Cost (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.10%	4.80%
Discount rate	4.80%	4.10%	4.80%

Segment_and_Geographic_Area_In2

Segment and Geographic Area Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
	operating_segment
	product_segment
	geographic_segment
Segment Reporting [Line Items]
Number of Reportable Segments	3
Number of Product Segments	2
Number of Operating Segments	6

Segment_Information_Detail

Segment Information (Detail) (USD $)	3 Months Ended										12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting [Line Items]
Revenues from external customers											$8,420	[1]	$7,964	[1]	$7,363	[1]
Earnings Before Interest Expense Income Taxes And Noncontrolling Interests	83		140	156	113	118		72	141	93	492		424		428
Total assets	4,010					3,830					4,010		3,830		3,608
Intersegment Eliminations [Member]
Segment Reporting [Line Items]
Earnings Before Interest Expense Income Taxes And Noncontrolling Interests											0		0		0
Total assets	69					36					69		36		24
Intersegment Revenues [Member]
Segment Reporting [Line Items]
Revenues from external customers											0		0		0
Intersegment Eliminations [Member]
Segment Reporting [Line Items]
Revenues from external customers											0		0		0
Intersegment Eliminations [Member] | Intersegment Revenues [Member]
Segment Reporting [Line Items]
Revenues from external customers											-230		-203		-201
Other Foreign Countries [Member]
Segment Reporting [Line Items]
Revenues from external customers											2,202	[1],[2]	2,220	[1],[2]	2,147	[1],[2]
Total assets	1,133	[2]				1,200	[2]				1,133	[2]	1,200	[2]	1,187	[2]
Other Foreign Countries [Member] | Other Segments [Member]
Segment Reporting [Line Items]
Revenues from external customers											0		0		0
Other Foreign Countries [Member] | Intersegment Revenues [Member] | Other Segments [Member]
Segment Reporting [Line Items]
Revenues from external customers											0		0		0
Clean Air Division [Member] | North America [Member]
Segment Reporting [Line Items]
Revenues from external customers											2,815		2,658		2,506
Earnings Before Interest Expense Income Taxes And Noncontrolling Interests											237		229		202
Total assets	1,165					1,030					1,165		1,030		1,029
Clean Air Division [Member] | North America [Member] | Intersegment Revenues [Member]
Segment Reporting [Line Items]
Revenues from external customers											25		8		6
Clean Air Division [Member] | Europe South America And India [Member]
Segment Reporting [Line Items]
Revenues from external customers											1,974		1,934		1,726
Earnings Before Interest Expense Income Taxes And Noncontrolling Interests											59		57		54
Total assets	789					827					789		827		725
Clean Air Division [Member] | Europe South America And India [Member] | Intersegment Revenues [Member]
Segment Reporting [Line Items]
Revenues from external customers											114		111		101
Clean Air Division [Member] | Segment Asia Pacific [Member]
Segment Reporting [Line Items]
Revenues from external customers											1,022		852		694
Earnings Before Interest Expense Income Taxes And Noncontrolling Interests											101		84		71
Total assets	593					544					593		544		435
Clean Air Division [Member] | Segment Asia Pacific [Member] | Intersegment Revenues [Member]
Segment Reporting [Line Items]
Revenues from external customers											0		1		1
Ride Performance Division [Member] | North America [Member]
Segment Reporting [Line Items]
Revenues from external customers											1,351		1,255		1,213
Earnings Before Interest Expense Income Taxes And Noncontrolling Interests											143		124		122
Total assets	664					628					664		628		593
Ride Performance Division [Member] | North America [Member] | Intersegment Revenues [Member]
Segment Reporting [Line Items]
Revenues from external customers											10		10		10
Ride Performance Division [Member] | Europe South America And India [Member]
Segment Reporting [Line Items]
Revenues from external customers											1,032		1,046		1,041
Earnings Before Interest Expense Income Taxes And Noncontrolling Interests											40		-7		41
Total assets	503					552					503		552		600
Ride Performance Division [Member] | Europe South America And India [Member] | Intersegment Revenues [Member]
Segment Reporting [Line Items]
Revenues from external customers											38		41		53
Ride Performance Division [Member] | Segment Asia Pacific [Member]
Segment Reporting [Line Items]
Revenues from external customers											226		219		183
Earnings Before Interest Expense Income Taxes And Noncontrolling Interests											36		22		5
Total assets	227					213					227		213		202
Ride Performance Division [Member] | Segment Asia Pacific [Member] | Intersegment Revenues [Member]
Segment Reporting [Line Items]
Revenues from external customers											43		32		30
Other Segments [Member]
Segment Reporting [Line Items]
Earnings Before Interest Expense Income Taxes And Noncontrolling Interests											-124		-85		-67
Total assets	$0					$0					$0		$0		$0
[1]	Revenues are attributed to countries based on location of the shipper.
[2]	Revenues from external customers and long-lived assets for individual foreign countries other than China, Germany, Mexico, and Canada are not material.

Revenue_from_External_Customer

Revenue from External Customers table (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting [Line Items]
Revenues from external customers	$8,420	[1]	$7,964	[1]	$7,363	[1]
Clean Air Systems And Products
Segment Reporting [Line Items]
Revenues from external customers	5,811		5,444		4,926
Clean Air Systems And Products | Aftermarket
Segment Reporting [Line Items]
Revenues from external customers	318		327		318
Clean Air Systems And Products | Original Equipment
Segment Reporting [Line Items]
Revenues from external customers	5,493		5,117		4,608
Clean Air Systems And Products | Original Equipment | OE Value-add
Segment Reporting [Line Items]
Revenues from external customers	3,559		3,282		2,948
Clean Air Systems And Products | Original Equipment | OE Substrate
Segment Reporting [Line Items]
Revenues from external customers	1,934		1,835		1,660
Ride Control Systems And Products
Segment Reporting [Line Items]
Revenues from external customers	2,609		2,520		2,437
Ride Control Systems And Products | Aftermarket
Segment Reporting [Line Items]
Revenues from external customers	976		953		944
Ride Control Systems And Products | Original Equipment
Segment Reporting [Line Items]
Revenues from external customers	$1,633		$1,567		$1,493
[1]	Revenues are attributed to countries based on location of the shipper.

Revenue_Percent_by_Major_Custo

Revenue Percent by Major Customers (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
General Motors
Revenue, Major Customer [Line Items]
Customer accounted for ten percent or more of net sales	15.00%	15.00%	17.00%
Ford
Revenue, Major Customer [Line Items]
Customer accounted for ten percent or more of net sales	13.00%	14.00%	15.00%

Geographic_Information_Table_D

Geographic Information Table (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Schedule Of Geographical Information [Line Items]
Revenues from external customers	$8,420	[1]	$7,964	[1]	$7,363	[1]
Long-lived assets	1,351	[2]	1,316	[2]	1,261	[2]
Total assets	4,010		3,830		3,608
United States
Schedule Of Geographical Information [Line Items]
Revenues from external customers	3,348	[1]	3,144	[1]	2,975	[1]
Long-lived assets	473	[2]	448	[2]	429	[2]
Total assets	1,710		1,552		1,521
Germany
Schedule Of Geographical Information [Line Items]
Revenues from external customers	1,079	[1]	875	[1]	661	[1]
Long-lived assets	192	[2]	158	[2]	139	[2]
Total assets	683		602		448
Canada
Schedule Of Geographical Information [Line Items]
Revenues from external customers	955	[1]	941	[1]	817	[1]
Long-lived assets	113	[2]	120	[2]	115	[2]
Total assets	319		358		344
CHINA
Schedule Of Geographical Information [Line Items]
Revenues from external customers	423	[1]	397	[1]	374	[1]
Long-lived assets	34	[2]	31	[2]	31	[2]
Total assets	156		126		120
Mexico
Schedule Of Geographical Information [Line Items]
Revenues from external customers	413	[1]	387	[1]	389
Long-lived assets	52		59		57
Total assets	164		182		168
Other Foreign Countries [Member]
Schedule Of Geographical Information [Line Items]
Revenues from external customers	2,202	[1],[3]	2,220	[1],[3]	2,147	[1],[3]
Long-lived assets	487	[2],[3]	500	[2],[3]	490	[2],[3]
Total assets	1,133	[3]	1,200	[3]	1,187	[3]
Intersegment Eliminations [Member]
Schedule Of Geographical Information [Line Items]
Revenues from external customers	0		0		0
Long-lived assets	0
Reclass & Elims
Schedule Of Geographical Information [Line Items]
Total assets	($155)		($190)		($180)
[1]	Revenues are attributed to countries based on location of the shipper.
[2]	Long-lived assets include all long-term assets except goodwill, intangibles and deferred tax assets.
[3]	Revenues from external customers and long-lived assets for individual foreign countries other than China, Germany, Mexico, and Canada are not material.

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
				LegalMatter
				defendent
				case
				State
Commitment And Contingencies [Line Items]
Estimate of authorized expenditures required to complete facilities and projects				$132
Operating Leases, 2015				46
Operating Leases, 2016				35
Operating Leases, 2017				27
Operating Leases, 2018				21
Operating Leases, 2019				14
Operating Leases for subsequent years				18
Capital Lease, 2015 (less than $1 million)				1
Capital Lease, 2016 (less than $1 million)				1
Capital Lease, 2017 (less than $1 million)				1
Capital Lease, 2018 (less than $1 million)				1
Capital Lease, 2019 (less than $1 million)				1
Total rental expense				64	58	55
Environmental remediation accrual, discounted basis				15
Portion of environmental remediation costs recorded in other current liabilities				3
Portion of environmental remediation costs recorded in deferred credits and other liabilities				12
Weighted average discount rate				2.20%
Environmental remediation accrual, undiscounted basis				19
Expected payments of environmental remediation costs, 2014				3
Expected payments of environmental remediation costs, 2015				1
Expected payments of environmental remediation costs, 2016				1
Expected payments of environmental remediation costs, 2017				1
Expected payments of environmental remediation costs, 2018				1
Expected payments of environmental remediation costs, thereafter				12
Number of states for which we are subject to an audit with respect to payment of unclaimed property				11
Number of years subject to audit with respect to payment of unclaimed property				30 years
Number of complaints filed alleging exposure to asbestos from our product categories				20,000
Current docket of active and inactive cases nationwide relating to alleged exposure to asbestos from our product categories				500
Number of defendants in many asbestos related cases				100
Premium freight and overtime costs incurred	$2	$2	$2		$3

Warranty_Accrual_Table_Detail

Warranty Accrual Table (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Product Warranty [Line Items]
Beginning Balance	$24	$23	$26
Accruals related to product warranties	24	20	15
Reductions for payments made	-22	-19	-18
Ending Balance	$26	$24	$23

Supplemental_Guarantor_Condens2

Supplemental Guarantor Condensed Consolidating Financial Statements - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Ownership percentage of existing and future material domestic owned subsidiaries	100.00%
Comprehensive income (loss) attributable to Tenneco Inc.	$41	$231	$249
Missclassification Of Intercompany Dividends [Member]
Intercompany dividends and net increase (decrease) in intercompany obligations		59	47
Correction To Other Comprehensive Income (Loss) [Member]
Comprehensive income (loss) attributable to Tenneco Inc.		$48	$26

Statement_of_Comprehensive_Inc

Statement of Comprehensive Income Loss (Detail) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales and operating revenues —
External									$8,420	$7,964	$7,363
Net sales and operating revenues	2,004	2,081	2,241	2,094	2,031	1,963	2,067	1,903	8,420	7,964	7,363
Costs and expenses
Cost of sales (exclusive of depreciation and amortization shown below)	1,685	1,735	1,851	1,754	1,703	1,691	1,736	1,604	7,025	6,734	6,170
Goodwill impairment charge									0	0	0
Engineering, research, and development									169	144	126
Selling, general, and administrative									519	453	427
Depreciation and amortization of other intangibles									208	205	205
Costs and expenses									7,921	7,536	6,928
Other income (expense)
Loss on sale of receivables									-4	-4	-4
Other income (expense)									-3	0	-3
Total other income (expense)									-7	-4	-7
Earnings before interest expense, income taxes, and noncontrolling interests	83	140	156	113	118	72	141	93	492	424	428
Interest expense —
External (net of interest capitalized)									91	80	105
Earnings (loss) before income taxes, noncontrolling interests and equity in net income from affiliated companies									401	344	323
Income tax expense									131	122	19
Net income									270	222	304
Less: Net income attributable to noncontrolling interests									44	39	29
Net income (loss) attributable to Tenneco Inc.	21	78	81	46	54	12	63	54	226	183	275
Comprehensive income (loss) attributable to Tenneco Inc.									41	231	249
Guarantor Subsidiaries
Net sales and operating revenues —
External									3,727	3,498	3,331
Affiliated companies									403	350	182
Net sales and operating revenues									4,130	3,848	3,513
Costs and expenses
Cost of sales (exclusive of depreciation and amortization shown below)									3,391	3,103	3,056
Engineering, research, and development									81	66	57
Selling, general, and administrative									211	187	198
Depreciation and amortization of other intangibles									86	78	72
Costs and expenses									3,769	3,434	3,383
Other income (expense)
Other income (expense)									26	-1	115
Total other income (expense)									26	-1	115
Earnings before interest expense, income taxes, and noncontrolling interests									387	413	245
Interest expense —
External (net of interest capitalized)									-1	-2	0
Affiliated companies (net of interest income)									73	70	212
Earnings (loss) before income taxes, noncontrolling interests and equity in net income from affiliated companies									315	345	33
Income tax expense									94	60	-39
Equity in net income (loss) from affiliated companies									129	32	217
Net income									350	317	289
Net income (loss) attributable to Tenneco Inc.									350	317	289
Comprehensive income (loss) attributable to Tenneco Inc.									350	317	289
Non-Guarantor Subsidiaries
Net sales and operating revenues —
External									4,693	4,466	4,032
Affiliated companies									602	572	547
Net sales and operating revenues									5,295	5,038	4,579
Costs and expenses
Cost of sales (exclusive of depreciation and amortization shown below)									4,639	4,553	3,843
Goodwill impairment charge									0	0	0
Engineering, research, and development									88	78	69
Selling, general, and administrative									302	260	224
Depreciation and amortization of other intangibles									122	127	133
Costs and expenses									5,151	5,018	4,269
Other income (expense)
Loss on sale of receivables									-4	-4	-4
Other income (expense)									9	59	-71
Total other income (expense)									5	55	-75
Earnings before interest expense, income taxes, and noncontrolling interests									149	75	235
Interest expense —
External (net of interest capitalized)									4	5	5
Affiliated companies (net of interest income)									-75	-72	-81
Earnings (loss) before income taxes, noncontrolling interests and equity in net income from affiliated companies									220	142	311
Income tax expense									37	62	58
Net income									183	80	253
Less: Net income attributable to noncontrolling interests									44	39	29
Net income (loss) attributable to Tenneco Inc.									139	41	224
Comprehensive income (loss) attributable to Tenneco Inc.									139	41	224
Tenneco Inc. (Parent Company)
Costs and expenses
Engineering, research, and development									0
Selling, general, and administrative									6	6	5
Costs and expenses									6	6	5
Other income (expense)
Earnings before interest expense, income taxes, and noncontrolling interests									-6	-6	-5
Interest expense —
External (net of interest capitalized)									88	77	100
Affiliated companies (net of interest income)									2	2	-131
Earnings (loss) before income taxes, noncontrolling interests and equity in net income from affiliated companies									-96	-85	26
Equity in net income (loss) from affiliated companies									322	268	249
Net income									226	183	275
Net income (loss) attributable to Tenneco Inc.									226	183	275
Comprehensive income (loss) attributable to Tenneco Inc.									41		249
Reclass & Elims
Net sales and operating revenues —
Affiliated companies									-1,005	-922	-729
Net sales and operating revenues									-1,005	-922	-729
Costs and expenses
Cost of sales (exclusive of depreciation and amortization shown below)									-1,005	-922	-729
Costs and expenses									-1,005	-922	-729
Other income (expense)
Other income (expense)									-38	-58	-47
Total other income (expense)									-38	-58	-47
Earnings before interest expense, income taxes, and noncontrolling interests									-38	-58	-47
Interest expense —
Earnings (loss) before income taxes, noncontrolling interests and equity in net income from affiliated companies									-38	-58	-47
Equity in net income (loss) from affiliated companies									-451	-300	-466
Net income									-489	-358	-513
Net income (loss) attributable to Tenneco Inc.									-489	-358	-513
Comprehensive income (loss) attributable to Tenneco Inc.									($489)	$358	($513)

Balance_Sheet_Detail

Balance Sheet (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$282	[1]	$275	[1]	$223	[1]	$214
Restricted cash	3		5
Receivables, net	1,088		1,060
Inventories	688		656
Deferred income taxes	81		71
Prepayments and other	284		223
Total current assets	2,426		2,290
Other assets:
Long-term receivables, net	12		14
Goodwill	65		69
Intangibles, net	26		30
Deferred income taxes	143		125
Other	120		127
Total other assets	366		365
Plant, property, and equipment, at cost	3,490		3,498
Less — Accumulated depreciation and amortization	-2,272		-2,323
Plant, property and equipment, net	1,218		1,175
Total Assets	4,010		3,830		3,608
Short-term debt (including current maturities of long-term debt)
Short-term debt — non-affiliated	60		83
Accounts payable	1,372		1,359
Accrued taxes	40		40
Other	327		356
Total current liabilities	1,799		1,838
Long-term debt — non-affiliated	1,069		1,019
Deferred income taxes	18		28
Postretirement benefits and other liabilities	551		453
Commitments and contingencies
Total liabilities	3,437		3,338
Redeemable noncontrolling interests	35		20
Total Tenneco Inc. shareholders’ equity	497		433
Noncontrolling interests	41		39
Total equity	538		472		291
Total liabilities, redeemable noncontrolling interests and equity	4,010		3,830
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	10		6		4		1
Receivables, net	408		387
Inventories	312		279
Deferred income taxes	49		87
Prepayments and other	96		35
Total current assets	875		794
Other assets:
Investment in affiliated companies	1,064		944
Notes and advances receivable from affiliates	944		1,026
Long-term receivables, net	12		12
Goodwill	22		22
Intangibles, net	10		13
Deferred income taxes	76		72
Other	40		44
Total other assets	2,168		2,133
Plant, property, and equipment, at cost	1,236		1,173
Less — Accumulated depreciation and amortization	-845		-807
Plant, property and equipment, net	391		366
Total Assets	3,434		3,293
Short-term debt (including current maturities of long-term debt)
Short-term debt — affiliated	243		247
Accounts payable	478		521
Accrued taxes	-15		9
Other	134		128
Total current liabilities	840		905
Long-term debt — affiliated	1,730		1,700
Postretirement benefits and other liabilities	418		357
Commitments and contingencies
Total liabilities	2,988		2,962
Total Tenneco Inc. shareholders’ equity	446		331
Total equity	446		331
Total liabilities, redeemable noncontrolling interests and equity	3,434		3,293
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	272		269		219		213
Restricted cash	3		5
Receivables, net	1,309		1,306
Inventories	376		377
Deferred income taxes	25		0
Prepayments and other	188		188
Total current assets	2,173		2,145
Other assets:
Notes and advances receivable from affiliates	10,589		7,320
Long-term receivables, net	0		2
Goodwill	43		47
Intangibles, net	16		17
Deferred income taxes	14		9
Other	53		60
Total other assets	10,715		7,455
Plant, property, and equipment, at cost	2,254		2,325
Less — Accumulated depreciation and amortization	-1,427		-1,516
Plant, property and equipment, net	827		809
Total Assets	13,715		10,409
Short-term debt (including current maturities of long-term debt)
Short-term debt — non-affiliated	54		68
Short-term debt — affiliated	220		176
Accounts payable	1,000		1,011
Accrued taxes	31		31
Other	241		285
Total current liabilities	1,546		1,571
Long-term debt — non-affiliated	44		8
Long-term debt — affiliated	10,516		7,338
Deferred income taxes	18		28
Postretirement benefits and other liabilities	129		92
Commitments and contingencies
Total liabilities	12,253		9,037
Redeemable noncontrolling interests	35		20
Total Tenneco Inc. shareholders’ equity	1,386		1,313
Noncontrolling interests	41		39
Total equity	1,427		1,352
Total liabilities, redeemable noncontrolling interests and equity	13,715		10,409
Tenneco Inc. (Parent Company)
Current assets:
Receivables, net	0		16
Deferred income taxes	7		7
Total current assets	7		23
Other assets:
Investment in affiliated companies	764		696
Notes and advances receivable from affiliates	4,844		4,826
Deferred income taxes	53		44
Other	27		23
Total other assets	5,688		5,589
Total Assets	5,695		5,612
Short-term debt (including current maturities of long-term debt)
Short-term debt — non-affiliated	6		15
Short-term debt — affiliated	9		10
Accrued taxes	24
Other	3		9
Total current liabilities	42		34
Long-term debt — non-affiliated	1,025		1,011
Long-term debt — affiliated	4,131		4,134
Commitments and contingencies
Total liabilities	5,198		5,179
Total Tenneco Inc. shareholders’ equity	497		433
Total equity	497		433
Total liabilities, redeemable noncontrolling interests and equity	5,695		5,612
Reclass & Elims
Current assets:
Receivables, net	-629		-649
Deferred income taxes	0		-23
Total current assets	-629		-672
Other assets:
Investment in affiliated companies	-1,828		-1,640
Notes and advances receivable from affiliates	-16,377		-13,172
Total other assets	-18,205		-14,812
Total Assets	-18,834		-15,484
Short-term debt (including current maturities of long-term debt)
Short-term debt — affiliated	-472		-433
Accounts payable	-106		-173
Other	-51		-66
Total current liabilities	-629		-672
Long-term debt — affiliated	-16,377		-13,172
Postretirement benefits and other liabilities	4		4
Commitments and contingencies
Total liabilities	-17,002		-13,840
Total Tenneco Inc. shareholders’ equity	-1,832		-1,644
Total equity	-1,832		-1,644
Total liabilities, redeemable noncontrolling interests and equity	($18,834)		($15,484)
[1]	Cash and cash equivalents include highly liquid investments with a maturity of three months or less at the date of purchase.

Statement_of_Cash_Flows_Detail

Statement of Cash Flows (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Operating Activities
Net cash provided (used) by operating activities	$341		$503		$365
Investing Activities
Proceeds from sale of assets	3		8		3
Cash payments for plant, property, and equipment	-328		-244		-256
Cash payments for software related intangible assets	-13		-25		-13
Payments To Acquire Assets Net Of Cash Acquired	-3		0		-7
Changes in restricted cash	2		-5		0
Net cash used by investing activities	-339		-266		-273
Financing Activities
Retirement of long-term debt	-462		-16		-411
Issuance of long-term debt	-570		0		-250
Debt issuance cost on long-term debt	-12		0		-13
Tax benefit from stock-based compensation	26		24		0
Purchase of common stock under the share repurchase program	-22		-27		-18
Issuance of common stock	19		20		5
Increase in bank overdrafts	6		-6		5
Net increase/decrease in revolver borrowings and short-term debt excluding current maturities of long-term debt	-70		-22		67
Net increase in short-term borrowings secured by accounts receivable	-10		-40		50
Capital contribution from noncontrolling interest partner	5		0		5
Purchase of noncontrolling equity interest	0		-69		0
Distribution to noncontrolling interest partners	-30		-39		-29
Net cash provided (used) by financing activities	20		-175		-89
Effect of foreign exchange rate changes on cash and cash equivalents	-15		-10		6
Increase in cash and cash equivalents	7		52		9
Cash and cash equivalents, January 1	275	[1]	223	[1]	214
Cash and cash equivalents, December 31 (Note)	282	[1]	275	[1]	223	[1]
Guarantor Subsidiaries
Operating Activities
Net cash provided (used) by operating activities	44		270		385
Investing Activities
Proceeds from sale of assets	0		1		0
Cash payments for plant, property, and equipment	-106		-102		-101
Cash payments for software related intangible assets	-5		-19		-6
Payments To Acquire Assets Net Of Cash Acquired	3				-7
Net cash used by investing activities	-114		-120		-114
Financing Activities
Intercompany dividends and net increase (decrease) in intercompany obligations	74		-148		-268
Net cash provided (used) by financing activities	74		-148		-268
Increase in cash and cash equivalents	4		2		3
Cash and cash equivalents, January 1	6		4		1
Cash and cash equivalents, December 31 (Note)	10		6		4
Non-Guarantor Subsidiaries
Operating Activities
Net cash provided (used) by operating activities	314		244		253
Investing Activities
Proceeds from sale of assets	3		7		3
Cash payments for plant, property, and equipment	-222		-142		-155
Cash payments for software related intangible assets	-8		-6		-7
Payments To Acquire Assets Net Of Cash Acquired					0
Changes in restricted cash	2		-5
Net cash used by investing activities	-225		-146		-159
Financing Activities
Retirement of long-term debt	-9		-2		-1
Issuance of long-term debt	45				0
Increase in bank overdrafts	6		-6		5
Net increase/decrease in revolver borrowings and short-term debt excluding current maturities of long-term debt	-13		-43		48
Intercompany dividends and net increase (decrease) in intercompany obligations	-75		121		-122
Capital contribution from noncontrolling interest partner	5				5
Purchase of noncontrolling equity interest			-69		0
Distribution to noncontrolling interest partners	-30		-39		-29
Net cash provided (used) by financing activities	-71		-38		-94
Effect of foreign exchange rate changes on cash and cash equivalents	-15		-10		6
Increase in cash and cash equivalents	3		50		6
Cash and cash equivalents, January 1	269		219		213
Cash and cash equivalents, December 31 (Note)	272		269		219
Tenneco Inc. (Parent Company)
Operating Activities
Net cash provided (used) by operating activities	21		48		-226
Financing Activities
Retirement of long-term debt	-453		-14		-410
Issuance of long-term debt	-525				-250
Debt issuance cost on long-term debt	-12				-13
Tax benefit from stock-based compensation	26		24
Purchase of common stock under the share repurchase program	-22		-27		-18
Issuance of common stock	19		20		5
Net increase/decrease in revolver borrowings and short-term debt excluding current maturities of long-term debt	-57		21		19
Net increase in short-term borrowings secured by accounts receivable	-10		-40		50
Intercompany dividends and net increase (decrease) in intercompany obligations	-37		-32		343
Net cash provided (used) by financing activities	-21		-48		226
Reclass & Elims
Operating Activities
Net cash provided (used) by operating activities	-38		-59		-47
Financing Activities
Intercompany dividends and net increase (decrease) in intercompany obligations	38		59		47
Net cash provided (used) by financing activities	$38		$59		$47
[1]	Cash and cash equivalents include highly liquid investments with a maturity of three months or less at the date of purchase.

Quarterly_Financial_Data_Detai

Quarterly Financial Data (Detail) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Line Items]
Net sales and operating revenues	$2,004	$2,081	$2,241	$2,094	$2,031	$1,963	$2,067	$1,903	$8,420	$7,964	$7,363
Cost of Sales (Excluding Depreciation and Amortization)	1,685	1,735	1,851	1,754	1,703	1,691	1,736	1,604	7,025	6,734	6,170
Earnings Before Interest Expense, Income Taxes and Noncontrolling Interests	83	140	156	113	118	72	141	93	492	424	428
Net income attributable to Tenneco Inc.	$21	$78	$81	$46	$54	$12	$63	$54	$226	$183	$275
Basic earnings per share of common stock (in dollars per share)	$0.34	$1.29	$1.34	$0.76	$0.90	$0.19	$1.04	$0.90	$3.72	$3.03	$4.58
Diluted earnings per share of common stock (in dollars per share)	$0.33	$1.27	$1.32	$0.75	$0.88	$0.19	$1.02	$0.88	$3.66	$2.97	$4.50

Recovered_Sheet7

Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$14	$14	$17
Charged to Costs and Expenses	4	1	3
Charged to Other Accounts	0	0	0
Deductions	2	1	6
Balance at End of Year	$16	$14	$14