Acquisitions and Divestitures - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Net sales and operating revenues	$ 17,860	$ 17,153
Earnings before income taxes and noncontrolling interests	488	235
Net income attributable to Tenneco Inc.	$ 275	$ 372
Basic earnings per share of common stock (in dollars per share)	$ 3.41	$ 4.52
Diluted earnings per share of common stock (in dollars per share)	$ 3.40	$ 4.51

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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- Definition

Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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No definition available.

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