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v3.26.1

Variable Interest Entities (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Dec. 31, 2024
Variable Interest Entity [Line Items] |  |  |  |
Cash and cash equivalents | $ 203 | $ 63 | $ 903 | $ 60
Receivables, Net, Current | 1,968 | 2,084 |  |
Inventories | 335 | 314 |  |
Other current assets and deferred charges | 398 | 256 |  |
Property, plant, and equipment – net | 44,410 | 41,996 |  |
Intangible assets – net | 6,577 | 6,763 |  |
Regulatory assets, deferred charges, and other | 1,985 | 2,011 |  |
Accounts payable | (2,220) | (2,224) |  |
Other current liabilities | (1,518) | (1,639) |  |
Regulatory liabilities, deferred income, and other | $ (4,979) | (4,986) |  |
Indirect Ownership Interest | Cogentrix Co-Investment Fund, LP | Gas & NGL Marketing Services |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 10.00% |  |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Cash and cash equivalents | $ 183 | 53 |  |
Receivables, Net, Current | 170 | 155 |  |
Inventories | 7 | 6 |  |
Other current assets and deferred charges | 3 | 5 |  |
Property, plant, and equipment – net | 4,406 | 4,412 |  |
Intangible assets – net | 1,777 | 1,831 |  |
Regulatory assets, deferred charges, and other | 21 | 23 |  |
Accounts payable | (61) | (56) |  |
Other current liabilities | (32) | (19) |  |
Regulatory liabilities, deferred income, and other | $ (76) | $ (78) |  |
Variable Interest Entity, Primary Beneficiary [Member] | Williams Companies Inc [Member] | Northeast JV [Member] | Northeast G & P [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Variable Interest Entity Ownership Percentage | 65.00% |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | Williams Companies Inc [Member] | Cardinal Gas Services LLC [Member] | Northeast G & P [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Variable Interest Entity Ownership Percentage | 66.00% |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | Williams Companies Inc [Member] | Driftwood Pipeline LLC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Variable Interest Entity Ownership Percentage | 80.00% |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] | Williams Companies Inc [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity-method investments | $ 617 |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] | Williams Companies Inc [Member] | Louisiana LNG LLC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Variable Interest Entity Ownership Percentage | 10.00% |  |  |
Equity-method investments | $ 289 |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] | Williams Companies Inc [Member] | Cogentrix Co-Investment Fund, LP |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity-method investments | $ 289 |  |  |

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