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Description of Business	12 Months Ended
Description of Business	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Tenneco Inc. ("Tenneco" or "the Company") was formed under the laws of Delaware in 1996. Tenneco designs, manufactures, and sells products and services for light vehicle, commercial truck, off-highway, industrial and aftermarket customers. The Company is one of the world’s leading manufacturers of clean air, powertrain, and ride performance products and systems, and serves both original equipment manufacturers (“OEM”) and replacement markets worldwide. Effective October 1, 2018, the Company completed the acquisition (the "Acquisition") of Federal-Mogul LLC ("Federal-Mogul"), a global supplier of technology and innovation in vehicle and industrial products for fuel economy, emissions reductions, and safety systems. Federal-Mogul serves the world’s foremost OEM and servicers (“OES”, and together with OEM, “OE”) of automotive, light, medium and heavy-duty commercial vehicles, off road, agricultural, marine, rail, aerospace, power generation, and industrial equipment, as well as the worldwide aftermarket. The Company expects to separate its businesses to form two new, independent publicly traded companies, an Aftermarket and Ride Performance company and a new Powertrain Technology company, in the second half of 2019.