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Description of Business	12 Months Ended
Description of Business	Dec. 31, 2020
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. The Company designs, manufactures, markets, and distributes products and services for light vehicle, commercial truck, off-highway, industrial, motorsport, and aftermarket customers. The Company manufactures innovative clean air, powertrain and ride performance products and systems, and serves both original equipment (“OE”) manufacturers and the repair and replacement markets worldwide. On January 10, 2019, the Company completed the acquisition of a 90.5% ownership interest in Öhlins Intressenter AB (“Öhlins”, the “Öhlins Acquisition”), a Swedish technology company that develops premium suspension systems and components for the automotive and motorsport industries. Effective 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 served the world’s foremost OE manufacturers of light vehicle, commercial truck, off-highway, and industrial equipment, as well as the worldwide aftermarket. The Company has previously announced its review of a full range of strategic options to enhance shareholder value creation, including a potential separation of the Company into an Aftermarket and Ride Performance company and a new Powertrain Technology company. In light of current market conditions and other factors, the Company's current efforts to optimize shareholder value creation are also focused on operational improvements, reducing structural costs, lowering capital intensity, reducing debt, and growth in targeted business lines.