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General, Description of Business, and Basis of Presentation (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Sep. 03, 2021
General and Description Of Business [Abstract] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 1,500
Stock Repurchase Program Cumulative Amount Purchased | $ 139 |  |  |
Purchases of treasury stock | $ 0 | $ 0 |  |
Williams Companies Inc [Member] | Gulfstar One [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
General and Description Of Business [Abstract] |  |  |  |
Variable Interest Entity Ownership Percentage | 51.00% |  |  |
Williams Companies Inc [Member] | Northeast JV [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
General and Description Of Business [Abstract] |  |  |  |
Variable Interest Entity Ownership Percentage | 65.00% |  |  |
Williams Companies Inc [Member] | Cardinal Gas Services LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
General and Description Of Business [Abstract] |  |  |  |
Variable Interest Entity Ownership Percentage | 66.00% |  |  |
Transmission, Power & Gulf [Member] | Gulfstream Natural Gas System, LLC [Member] |  |  |  |
General and Description Of Business [Abstract] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
Transmission, Power & Gulf [Member] | Discovery Producer Services LLC [Member] |  |  |  |
General and Description Of Business [Abstract] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 60.00% |
Northeast G & P [Member] | Blue Racer Midstream LLC [Member] |  |  |  |
General and Description Of Business [Abstract] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
West [Member] | Overland Pass Pipeline Company LLC [Member] |  |  |  |
General and Description Of Business [Abstract] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |
West [Member] | Williams Companies Inc [Member] | Conway Fractionator [Member] |  |  |  |
General and Description Of Business [Abstract] |  |  |  |
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest | 50.00% |  |  |

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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