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Description of Business	3 Months Ended
Description of Business	Mar. 31, 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. The Company manufactures innovative performance solutions, clean air and powertrain products and systems, 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 and a new Powertrain Technology company. Efforts to optimize shareholder value creation remain focused on operational improvements, reducing structural costs, lowering capital intensity, reducing debt, and growth in targeted business lines.