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Description of Business	3 Months Ended
Description of Business	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	1. 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. On October 1, 2018, the Company completed the acquisition of Federal-Mogul LLC (“Federal-Mogul”) (the “Federal-Mogul Acquisition”), 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, and power generation and industrial equipment, as well as the worldwide aftermarket. The Company has previously announced its intentions, and has agreed to use its reasonable best efforts, to separate the combined company to form two new, independent publicly traded companies, an Aftermarket and Ride Performance company ("DRiV") and a new Powertrain Technology company ("New Tenneco"). Current end-market conditions are affecting the Company's ability to complete a separation within its previously announced timeline and the Company expects these trends will continue throughout this year. The Company is ready to separate the businesses as soon as favorable conditions are present. In order to facilitate the separation, the Company continues to evaluate multiple strategic alternatives, as well as options to deleverage and mitigate the ongoing effect of challenging market conditions and better position it to facilitate a separation transaction.