Debt and Financing Arrangements (Notes)	6 Months Ended
Debt and Financing Arrangements (Notes)	Jun. 30, 2023
Debt Disclosure [Abstract]
Debt and Financing Arrangements	Debt and Financing Arrangements Credit Facility We, along with Williams and Transcontinental Gas Pipe Line Company, LLC (Transco), are party to a credit agreement with aggregate commitments available of $3.75 billion, with up to an additional $500 million increase in aggregate commitments available under certain circumstances. In the second quarter of 2023, the maturity date of our credit agreement was extended one year and now expires October 8, 2027. One participating lender, Credit Suisse AG, New York Branch, with a commitment of approximately $194 million did not extend their commitment beyond October 8, 2026. The amended credit agreement allows the co-borrowers to request up to two extensions of the maturity date each for an additional one-year period to allow a maturity date as late as October 8, 2029, under certain circumstances. Additionally, the amended credit agreement replaces the London Interbank Offered Rate with Term Secured Overnight Financing Rate as the benchmark interest rate index. We and Transco are each able to borrow up to $500 million under this credit facility to the extent not otherwise utilized by the other co-borrowers. At June 30, 2023, no letters of credit have been issued and no loans were outstanding under the credit facility. Commercial Paper Williams participates in a $3.5 billion commercial paper program, and Williams’ management considers amounts outstanding under this program to be a reduction of available capacity under the credit facility. At June 30, 2023, Williams had no outstanding commercial paper.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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NORTHWEST PIPELINE LLC 10-Q