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v3.26.1

Credit Facility and Commercial Paper (Details) $ in Millions | May 19, 2026 USD ($) | Jun. 30, 2026 USD ($) | Dec. 31, 2025 USD ($) | Oct. 08, 2021
--- | --- | --- | --- | ---
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Commercial paper, outstanding |  |  | $ 475 |  | $ 700 |
Williams Companies Inc [Member] |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Acquisition Trigger Amount |  | $ 25 |  |  |  |
Maximum ratio of debt to EBITDA after acquisition |  | 5.5 |  |  |  |
Williams Companies Inc [Member] | Revolving Credit Facility |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Credit facility, capacity |  | $ 3,750 | 3,750 | [1],[2] |  |
Additional amount by which credit facility can be increased |  | 500 |  |  |  |
Line Of Credit Facility Maximum Borrowing Capacity After Available Increased Commitments |  | 4,250 |  |  |  |
Credit facility, loans outstanding | [1],[2] |  | 0 |  |  |
Williams Companies Inc [Member] | Swing Line Loan [Member] |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Credit facility, capacity |  | 200 |  |  |  |
Williams Companies Inc [Member] | Letters of credit [Member] |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Credit facility, capacity |  | 500 |  |  |  |
Williams Companies Inc [Member] | 364-Day Credit Agreement |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Credit facility, capacity |  | 1,000 | 1,000 | [2] |  |
Additional amount by which credit facility can be increased |  | 150 |  |  |  |
Line Of Credit Facility Maximum Borrowing Capacity After Available Increased Commitments |  | 1,150 |  |  |  |
Credit facility, loans outstanding | [1],[2] |  | 0 |  |  |
Williams Companies Inc [Member] | Letters Of Credit Under Certain Bilateral Bank Agreements [Member] |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Credit facility, letters of credit outstanding |  |  | 15 |  |  |
Williams Companies Inc [Member] | Commercial paper [Member] |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Credit facility, capacity |  |  | $ 3,500 |  |  |
Short-Term Debt, Weighted Average Interest Rate, at Point in Time |  |  | 3.94% |  |  |
Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Maximum ratio of debt to capitalization |  |  |  |  |  | 65.00%
Transcontinental Gas Pipe Line Company, LLC [Member] | Letters of credit [Member] |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Credit facility, capacity |  | 500 |  |  |  |
Transcontinental Gas Pipe Line Company, LLC [Member] | 364-Day Credit Agreement |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Credit facility, capacity |  | 100 |  |  |  |
Northwest Pipeline LLC [Member] |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Maximum ratio of debt to capitalization |  |  |  |  |  | 65.00%
Northwest Pipeline LLC [Member] | Letters of credit [Member] |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Credit facility, capacity |  | 500 |  |  |  |
Northwest Pipeline LLC [Member] | 364-Day Credit Agreement |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Credit facility, capacity |  | $ 100 |  |  |  |
Dec21 And Subsequent Quarters [Member] | Williams Companies Inc [Member] |  |  |  |  |  |
Credit Facility and Commercial Paper [Line Items] |  |  |  |  |  |
Maximum ratio of debt to EBITDA |  | 5.0 |  |  |  |
[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 Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a 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. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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