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Acquisitions and Divestitures (Tables) | 9 Months Ended
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Sep. 30, 2025
Business Combination [Line Items] |
Business Combination, Pro Forma Information [Table Text Block] | The following pro forma Revenues and Net income (loss) attributable to The Williams Companies, Inc. for the three and nine months ended September 30, 2024, respectively, are presented as if the Crowheart Acquisition and Discovery Acquisition had been completed on January 1, 2023. These pro forma amounts are not necessarily indicative of what the actual results would have been if the acquisitions had in fact occurred on the dates or for the periods indicated, nor do they purport to project Revenues or Net income (loss) attributable to The Williams Companies, Inc. for any future periods or as of any date. These amounts do not give effect to any potential cost savings, operating synergies, or revenue enhancements to result from the transactions or the potential costs to achieve these cost savings, operating synergies, and revenue enhancements.
| Three Months Ended September 30, 2024
| As Reported |  | Pro Forma Crowheart |  | Pro Forma Discovery (1) |  |  |  |  |  |  |  | Pro Forma Combined
| (Millions)
Revenues | $ | 2,653 |  |  | $ | 16 |  |  | $ | 9 |  |  |  |  |  |  |  |  | $ | 2,678 |
Net income (loss) attributable to The Williams Companies, Inc. | 706 |  |  | 2 |  |  | (1) |  |  |  |  |  |  |  |  | 707 |
| Nine Months Ended September 30, 2024
| As Reported |  | Pro Forma Crowheart |  | Pro Forma Discovery (1) |  |  |  |  |  |  |  | Pro Forma Combined
| (Millions)
Revenues | $ | 7,760 |  |  | $ | 54 |  |  | $ | 58 |  |  |  |  |  |  |  |  | $ | 7,872 |
Net income (loss) attributable to The Williams Companies, Inc. | 1,739 |  |  | 11 |  |  | (5) |  |  |  |  |  |  |  |  | 1,745 |
(1)Excludes results from operations acquired in the acquisition for the period beginning on the acquisition date, as these results are included in the amounts as reported.
Crowheart Acquisition |
Business Combination [Line Items] |
Business Combination, Recognized Asset Acquired and Liability Assumed | The following table presents the preliminary allocation of the acquisition date fair value of the major classes of the assets acquired and liabilities assumed at November 1, 2024. The allocation is considered preliminary because the valuation work has not been completed due to the ongoing review of the valuation results and validation of significant inputs and assumptions. Preliminary fair value measurements were made for certain acquired assets and liabilities, primarily property, plant, and equipment, which utilized the income approach for proved developed producing reserves and the market approach for undeveloped reserves; however, adjustments to those measurements may be made in subsequent periods, up to one year from the acquisition date, as new information related to facts and circumstances as of the acquisition date may be identified. After the March 31, 2025, financial statements were issued, Williams identified adjustments to the preliminary purchase price allocation, resulting in decreases of $56 million in property, plant, and equipment and $56 million in noncurrent liabilities.
| (Millions)
Cash and cash equivalents | $ | 94 |
Other current assets | 15 |
Property, plant, and equipment – net | 345 |
Other noncurrent assets | 2 |
Total assets acquired | 456 |
Current liabilities | (45) |
Noncurrent liabilities | (59) |
Total liabilities assumed | (104) |
Net assets acquired | $ | 352 |
Discovery Acquisition |
Business Combination [Line Items] |
Business Combination, Recognized Asset Acquired and Liability Assumed | The following table presents the allocation of the acquisition date fair value of the major classes of the assets acquired and liabilities assumed at August 1, 2024. The valuation technique used consisted of the cost approach for property, plant, and equipment.
| (Millions)
Cash and cash equivalents | $ | 22 |
Other current assets | 19 |
Property, plant, and equipment – net | 941 |
Other noncurrent assets | 39 |
Total assets acquired | 1,021 |
Current liabilities | (40) |
Noncurrent liabilities | (296) |
Total liabilities assumed | (336) |
Net assets acquired | $ | 685 |
Gulf Coast Storage Acquisition |
Business Combination [Line Items] |
Business Combination, Recognized Asset Acquired and Liability Assumed | The following table presents the allocation of the acquisition date fair value of the major classes of the assets acquired and liabilities assumed at January 3, 2024.
| (Millions)
Cash and cash equivalents | $ | 46 |
Other current assets | 18 |
Property, plant, and equipment – net | 2,035 |
Other noncurrent assets | 2 |
Total assets acquired | 2,101 |
Current liabilities | (11) |
Noncurrent liabilities | (107) |
Total liabilities assumed | (118) |
Net assets acquired | $ | 1,983 |

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