Acquisitions and Divestitures (Tables)

3 Months Ended

Mar. 31, 2025

Business Acquisition [Line Items]

Business Acquisition, Pro Forma Information [Table Text Block]

The following pro forma Revenues and Net income (loss) attributable to The Williams Companies, Inc. for the three months ended March 31, 2024, 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 March 31, 2024
	As Reported		Pro Forma Crowheart		Pro Forma Discovery		Pro Forma Combined
	(Millions)
Revenues	$	2,771	$	21	$	25	$	2,817
Net income (loss) attributable to The Williams Companies, Inc.	632		6		(3)		635

Crowheart Acquisition

Business Acquisition [Line Items]

Schedule of Recognized Identified Assets Acquired and Liabilities 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.

	(Millions)
Cash and cash equivalents	$	94
Other current assets	15
Property, plant, and equipment – net	401
Other noncurrent assets	2
Total assets acquired	512
Current liabilities	(45)
Noncurrent liabilities	(115)
Total liabilities assumed	(160)
Net assets acquired	$	352

Discovery Acquisition

Business Acquisition [Line Items]

Schedule of Recognized Identified Assets Acquired and Liabilities 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 August 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 cost approach; 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.

	(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 Acquisition [Line Items]

Schedule of Recognized Identified Assets Acquired and Liabilities 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