Debt and Other Financing Arrangements - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 87	$ 82
Liquidity	2,200
Cash	719
Long-term Debt	5,081	5,171
Letters of credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	28
Uncommitted Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	77
Tenneco Inc. revolving credit agreement
Debt Instrument [Line Items]
Long-term Debt	0
Other assets
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 14	$ 17

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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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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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