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Debt and Banking Arrangements (Tables) | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Debt Issuances | Williams’ senior unsecured public debt issuances for 2025 are as follows:
Issue Date |  | Maturity Date |  | Amount |  | Rate
|  |  |  | (Millions) |  |
June 30, 2025 |  | June 30, 2030 |  | $ | 750 |  |  | 4.625%
June 30, 2025 |  | September 30, 2035 |  | 750 |  |  | 5.300%
January 9, 2025 |  | March 15, 2035 |  | 1,000 |  |  | 5.600%
January 9, 2025 |  | March 15, 2055 |  | 500 |  |  | 6.000%
Schedule of Extinguishment of Debt | Williams’ senior unsecured public debt retirements for 2025 are as follows:
Date of Retirement |  | Maturity Date |  | Amount |  | Rate
|  |  |  | (Millions) |  |
January 15, 2025 |  | January 15, 2025 |  | $ | 750 |  |  | 3.900%
September 15, 2025 |  | September 15, 2025 |  | 750 |  |  | 4.000%
Schedule of Line of Credit Facilities [Table Text Block] | Credit Facility Williams, Transco and NWP are party to a credit agreement with aggregate commitments available of $3.75 billion. In the second quarter of 2025, the maturity date of our Credit Agreement was extended one year and now expires October 8, 2028. Transco and NWP are each able to borrow up to $500 million under the credit facility to the extent not otherwise utilized by the other co-borrowers.
| September 30, 2025
| Stated Capacity |  | Outstanding
| (Millions)
Long-term credit facility (1) | $ | 3,750 |  |  | $ | — |
Letters of credit under certain bilateral bank agreements |  |  | 15 |
________________ (1) In managing its available liquidity, Williams does not expect a maximum outstanding amount in excess of the capacity of its credit facility inclusive of any outstanding amounts under the commercial paper program.

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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