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Description of Business	9 Months Ended
Description of Business	Sep. 30, 2021
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, markets, and distributes products and services for light vehicle, commercial truck, off-highway, industrial, motorsport, and aftermarket customers. Tenneco consists of four operating segments, Motorparts, Performance Solutions, Clean Air, and Powertrain and serves both original equipment (“OE”) manufacturers and the repair and replacement markets worldwide. The Company is continually evaluating its portfolio and 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, which consists of the Motorparts and Performance Solutions operating segments, and a new powertrain technology company, which consists of the Clean Air and Powertrain operating segments. Efforts to optimize shareholder value creation remain focused on operational improvements, reducing structural costs, lowering capital intensity, reducing net debt, and growth in targeted business lines.