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Debt and Banking Arrangements (Tables) | 6 Months Ended
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Jun. 30, 2026
Debt Disclosure [Abstract] |
Schedule of Debt Issuances | Issuances in 2026 are as follows:
Issue Date |  | Maturity Date |  | Amount |  | Rate
|  |  |  | (Millions) |  |
Williams’ Public Issuances: |  |  |  |  |  |
January 8, 2026 (1) |  | March 15, 2033 |  | $ | 500 |  |  | 5.650%
January 8, 2026 |  | March 15, 2036 |  | 1,250 |  |  | 5.150%
January 8, 2026 |  | March 15, 2056 |  | 1,000 |  |  | 5.950%
________________ (1) Additional issuance of the 5.65 percent senior notes due 2033 issued on March 2, 2023, and trade interchangeably with such notes.
Schedule of Extinguishment of Debt | Retirements in 2026 are as follows:
Date of Retirement |  | Maturity Date |  | Amount |  | Rate
|  |  |  | (Millions) |  |
Williams: |  |  |  |  |  |
March 2, 2026 |  | March 2, 2026 |  | $ | 1,100 |  |  | 5.400%
Schedule of Line of Credit Facilities [Table Text Block] |
| June 30, 2026
| Stated Capacity |  | Outstanding
| (Millions)
Williams Credit Agreement (1)(2) | $ | 3,750 |  |  | $ | — |
364-Day Credit Agreement (2) | 1,000 |  |  | — |
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. (2) Williams expects to be in compliance with the associated covenants for the June 30, 2026, reporting period.

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480657/210-10-S50-8 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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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