Debt and Other Financing Arrangements - Financing Arrangements (Details) $ in Billions	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	$ 1.5
Tenneco Inc. revolving credit agreement
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	1.5
Tenneco Inc. Term Loan A
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	0.0
2.75% Term Loan B Due 2019 Through 2025
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	0.0
Subsidiaries’ credit agreements
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	$ 0.0