Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value

No definition available.

Name:	ten_BusinessCombinationAcquisitionofLessthan100PercentRedeemableNoncontrollingInterestFairValue
Namespace Prefix:	ten_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Non-Cash Charge, Business Combination, Inventory Adjustment

+ References

No definition available.

+ Details

Name:	ten_NonCashChargeBusinessCombinationInventoryAdjustment
Namespace Prefix:	ten_
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_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

+ Details

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

- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 4A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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=108376223&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=108376223&loc=d3e13816-109267

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ten_FederalMogulMember
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Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_BusinessAcquisitionAxis=ten_SubsidiaryOfFederalMogulMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ten_MotorpartsMember
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Balance Type:
Period Type:

- Details

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Acquisitions and Divestitures - Acquisition of Federal-Mogul (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Oct. 01, 2018	Sep. 30, 2019	Dec. 31, 2018	Jun. 30, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Goodwill		$ 1,232	$ 1,231	$ 1,221	$ 1,213
Federal-Mogul
Business Acquisition [Line Items]
Step up of inventory	$ 149
Non-cash charge for inventory step-up		44	105
Redeemable noncontrolling interest	$ 96	88
Revenue since acquisition		5,537
Net income since acquisition		34
Subsidiary Of Federal-Mogul
Business Acquisition [Line Items]
Redeemable noncontrolling interest		81
Powertrain
Business Acquisition [Line Items]
Goodwill		343	388	412	409
Powertrain \| Federal-Mogul
Business Acquisition [Line Items]
Goodwill		343
Motorparts
Business Acquisition [Line Items]
Goodwill		619	611	547	544
Motorparts \| Federal-Mogul
Business Acquisition [Line Items]
Goodwill		395
Ride Performance
Business Acquisition [Line Items]
Goodwill		249	$ 210	$ 240	$ 238
Ride Performance \| Federal-Mogul
Business Acquisition [Line Items]
Goodwill		$ 65