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Acquisitions and Divestitures (Tables)
 12 Months Ended
Dec. 31, 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 2024 and 2023, respectively, are presented as if the Crowheart Acquisition, Discovery Acquisition, and Gulf Coast Storage Acquisition had been completed on January 1, 2023, and the DJ Basin Acquisitions and MountainWest Acquisition had been completed on January 1, 2022. 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.
Year Ended December 31, 2024
As Reported
Pro Forma Crowheart (1)
Pro Forma Discovery (1)
Pro Forma Combined
(Millions)
Revenues$10,503 $60 $58 $10,621 
Net income (loss) attributable to The Williams Companies, Inc.2,225 8 (5)2,228 
Year Ended December 31, 2023
As Reported
Pro Forma Crowheart
Pro Forma Discovery
Pro Forma Gulf Coast Storage
Pro Forma DJ Basin (1)
Pro Forma MountainWest (1)
Pro Forma Combined
(Millions)
Revenues$10,907 $74 $129 $202 $270 $35 $11,617 
Net income (loss) attributable to The Williams Companies, Inc.3,179 19 (1)53 17 6 3,273 
(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 allocation of the acquisition date fair value of the major classes of the assets acquired and liabilities assumed at November 1, 2024. After the December 31, 2024, 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 – net345 
Other noncurrent assets
2 
Total assets acquired456 
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 assets19 
Property, plant, and equipment – net941 
Other noncurrent assets39 
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 assets18 
Property, plant, and equipment – net2,035 
Other noncurrent assets2 
Total assets acquired
2,101 
Current liabilities(11)
Noncurrent liabilities
(107)
Total liabilities assumed(118)
Net assets acquired$1,983 
Cureton 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 November 30, 2023.
(Millions)
Cash and cash equivalents$6 
Other current assets21 
Property, plant, and equipment – net433 
Intangible assets – net117 
Other noncurrent assets1 
Total identifiable assets acquired578 
Current liabilities(29)
Noncurrent liabilities
(14)
Total liabilities assumed(43)
Net identifiable assets acquired535 
Goodwill included in Intangible assets – net
11 
Net assets acquired$546 
RMM 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 November 30, 2023. The net assets acquired primarily reflect the noncash consideration transferred, which includes the fair value of both Williams’ previous equity-method investment and the deferred consideration obligation.

(Millions)
Cash and cash equivalents$28 
Other current assets4 
Investments20 
Property, plant, and equipment – net1,041 
Intangible assets – net63 
Other noncurrent assets12 
Total identifiable assets acquired1,168 
Current liabilities(44)
Noncurrent liabilities
(103)
Total liabilities assumed(147)
Net identifiable assets acquired1,021 
Goodwill included in Intangible assets – net
55 
Net assets acquired$1,076 
MountainWest 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 February 14, 2023. The fair value of accounts receivable acquired equals contractual amounts receivable.
(Millions)
Cash and cash equivalents$23 
Trade accounts and other receivables33 
Other current assets26 
Investments20 
Property, plant, and equipment – net1,019 
Other noncurrent assets33 
Total identifiable assets acquired1,154 
Current liabilities(47)
Long-term debt(365)
Other noncurrent liabilities(95)
Total liabilities assumed(507)
Net identifiable assets acquired647 
Goodwill included in Intangible assets – net
400 
Net assets acquired$1,047