Debt and Other Financing Arrangements - Schedule of Long Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal	$ 1,399	$ 1,376
Carrying Amount	1,385	1,361
Less — maturities classified as current	4	3
Principal less current maturities	1,395	1,373
Total long-term debt	1,381	1,358
Unamortized debt issuance costs	12	13
Unamortized debt discount	2	2
Tenneco Inc. \| Term Loan \| Senior Tranche A Term Loan due 2022
Debt Instrument [Line Items]
Principal	380	390
Carrying Amount	378	388
Tenneco Inc. \| Senior Notes \| 5 3/8% Senior Notes due 2024
Debt Instrument [Line Items]
Principal	225	225
Carrying Amount	$ 222	222
Interest rate	5.375%
Tenneco Inc. \| Senior Notes \| 5% Senior Notes due 2026
Debt Instrument [Line Items]
Principal	$ 500	500
Carrying Amount	$ 493	492
Interest rate	5.00%
Other subsidiaries \| Other long term debt \| Other long-term debt due in 2020
Debt Instrument [Line Items]
Principal	$ 6	5
Carrying Amount	6	5
Other subsidiaries \| Other \| Notes due 2018 through 2028
Debt Instrument [Line Items]
Principal	10	12
Carrying Amount	8	10
Revolver borrowings due 2022 \| Tenneco Inc. \| Line of Credit
Debt Instrument [Line Items]
Principal	278	244
Carrying Amount	$ 278	$ 244

Debt Instrument, Face Amount Less Current Maturities

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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