Goodwill, Impaired, Foreign Currency Translation Gain (Loss)

No definition available.

Name:	ten_GoodwillImpairedForeignCurrencyTranslationGainLoss
Namespace Prefix:	ten_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266

+ Details

Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportingUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

+ Details

Name:	us-gaap_ReportingUnitAmountOfFairValueInExcessOfCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ten_CleanAirDivisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ten_PowertrainMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ten_RidePerformanceDivisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ten_MotorpartsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ReportingUnitAxis=ten_GreaterThan10Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ReportingUnitAxis=ten_LessThan10Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) reporting_unit	Mar. 31, 2019 USD ($) reporting_unit	Jun. 30, 2020 USD ($) reporting_unit	Dec. 31, 2019 USD ($)
Goodwill [Roll Forward]
Gross carrying amount at beginning of period	$ 1,241	$ 1,244		$ 1,244
Foreign exchange	3	(3)
Gross carrying amount at end of period	1,244	1,241		1,244
Accumulated impairment loss, beginning balance	(736)	(469)		(469)
Impairment		(267)		(267)
Accumulated foreign exchange	(3)
Accumulated impairment loss, ending balance	(739)	(736)		(739)
Net carrying value at end of period	505			$ 505	$ 775
Clean Air
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				3
Goodwill [Roll Forward]
Gross carrying amount at beginning of period	22	22		$ 22
Foreign exchange	0	0
Gross carrying amount at end of period	22	22		22
Accumulated impairment loss, beginning balance	0	0		0
Impairment		0
Accumulated foreign exchange	0
Accumulated impairment loss, ending balance	0	0		0
Net carrying value at end of period	22			$ 22
Powertrain
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				1
Goodwill [Roll Forward]
Gross carrying amount at beginning of period	343	343		$ 343
Foreign exchange	0	0
Gross carrying amount at end of period	343	343		343
Accumulated impairment loss, beginning balance	(178)	(18)		(18)
Impairment		(160)		(160)
Accumulated foreign exchange	0
Accumulated impairment loss, ending balance	(178)	$ (178)		(178)
Net carrying value at end of period	165			$ 165
Ride Performance
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit		2	2	1
Goodwill [Roll Forward]
Gross carrying amount at beginning of period	256	$ 259		$ 259
Foreign exchange	3	(3)
Gross carrying amount at end of period	259	256		259
Accumulated impairment loss, beginning balance	(249)	(212)		(212)
Impairment		(37)	$ (60)	(37)
Accumulated foreign exchange	(3)
Accumulated impairment loss, ending balance	(252)	(249)		(252)
Net carrying value at end of period	7			$ 7
Motorparts
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				1
Goodwill [Roll Forward]
Gross carrying amount at beginning of period	620	620		$ 620
Foreign exchange	0	0
Gross carrying amount at end of period	620	620		620
Accumulated impairment loss, beginning balance	(309)	(239)		(239)
Impairment		(70)		(70)
Accumulated foreign exchange	0
Accumulated impairment loss, ending balance	(309)	$ (309)		(309)
Net carrying value at end of period	311			$ 311
Greater than 10% \| Clean Air
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				3
Goodwill for reporting units where fair value exceeds carrying value	22			$ 22
Greater than 10% \| Powertrain
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				0
Goodwill for reporting units where fair value exceeds carrying value	0			$ 0
Greater than 10% \| Ride Performance
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				1
Goodwill for reporting units where fair value exceeds carrying value	7			$ 7
Greater than 10% \| Motorparts
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				0
Goodwill for reporting units where fair value exceeds carrying value	0			$ 0
Less than 10% \| Clean Air
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				0
Goodwill for reporting units where fair value exceeds carrying value	0			$ 0
Less than 10% \| Powertrain
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				1
Goodwill for reporting units where fair value exceeds carrying value	165			$ 165
Less than 10% \| Ride Performance
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				0
Goodwill for reporting units where fair value exceeds carrying value	0			$ 0
Less than 10% \| Motorparts
Goodwill [Line Items]
Number of reporting units with goodwill \| reporting_unit				1
Goodwill for reporting units where fair value exceeds carrying value	$ 311			$ 311