Acquisitions and Divestitures (Tables)

12 Months Ended

Jan. 03, 2024

Dec. 31, 2023

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 2023, 2022, and 2021, are presented as if the Gulf Coast Storage Acquisition had been completed on January 1, 2023, the DJ Basin Acquisitions and MountainWest Acquisition had been completed on January 1, 2022, the Trace Acquisition had been completed on January 1, 2021, and the Sequent Acquisition had been completed on January 1, 2020. 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, 2023
	As Reported		Pro Forma Gulf Coast Storage		Pro Forma DJ Basin (1)		Pro Forma MountainWest (1)		Pro Forma Combined
	(Millions)
Revenues	$	10,907	$	202	$	270	$	35	$	11,414
Net income (loss) attributable to The Williams Companies, Inc.	3,179		53		17		6		3,255
	Year Ended December 31, 2022
	As Reported		Pro Forma DJ Basin		Pro Forma MountainWest		Pro Forma Trace (1)		Pro Forma Combined
	(Millions)
Revenues	$	10,965	$	218	$	265	$	45	$	11,493
Net income (loss) attributable to The Williams Companies, Inc.	2,049		13		170		18		2,250
	Year Ended December 31, 2021
	As Reported				Pro Forma Trace		Pro Forma Sequent (1)		Pro Forma Combined
	(Millions)
Revenues	$	10,627			$	118	$	188	$	10,933
Net income (loss) attributable to The Williams Companies, Inc.	1,517				42		4		1,563

(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.

Gulf Coast Storage Acquisition | Subsequent Event [Member]

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, which will be included in our Transmission & Gulf of Mexico segment, and liabilities assumed at January 3, 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; 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. The fair value of accounts receivable acquired, included in Other current assets in the following table, equals contractual amounts receivable.

	(Millions)
Cash and cash equivalents	$	46
Other current assets	18
Property, plant, and equipment – net	2,042
Other noncurrent assets	2
Total assets acquired	$	2,108
Current liabilities	$	(10)
Noncurrent liabilities	(107)
Total liabilities assumed	$	(117)
Net assets acquired	$	1,991

Cureton 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, which are presented in our West segment, and liabilities assumed at November 30, 2023. 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 and other intangible assets; 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. The fair value of accounts receivable acquired, included in Other current assets in the following table, equals contractual amounts receivable.

	(Millions)
Cash and cash equivalents	$	2
Other current assets	21
Property, plant, and equipment – net	437
Intangible assets – net of accumulated amortization	117
Other noncurrent assets	4
Total identifiable assets acquired	$	581
Current liabilities	$	(25)
Noncurrent liabilities	(16)
Total liabilities assumed	$	(41)
Net identifiable assets acquired	$	540
Goodwill included in Intangible assets – net of accumulated amortization	6
Net assets acquired	$	546

RMM 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, which are presented in our West segment, and liabilities assumed at November 30, 2023. The net assets acquired primarily reflect the noncash consideration transferred, which includes the fair value of both our previous equity-method investment and the deferred consideration obligation. 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 and other intangible assets; 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. The fair value of accounts receivable acquired, included in Other current assets in the following table, equals contractual amounts receivable.

	(Millions)
Cash and cash equivalents	$	28
Other current assets	4
Investments	20
Property, plant, and equipment – net	1,041
Intangible assets – net of accumulated amortization	61
Other noncurrent assets	12
Total identifiable assets acquired	$	1,166
Current liabilities	$	(44)
Noncurrent liabilities	(103)
Total liabilities assumed	$	(147)
Net identifiable assets acquired	$	1,019
Goodwill included in Intangible assets – net of accumulated amortization	57
Net assets acquired	$	1,076

MountainWestAcquisition

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, which are presented in our Transmission & Gulf of Mexico segment, and liabilities assumed at February 14, 2023. The fair value of accounts receivable acquired equals contractual amounts receivable. After the March 31, 2023, financial statements were issued, we identified adjustments to the preliminary purchase price allocation, primarily resulting in an increase of $19 million in trade accounts and other receivables and decreases of $73 million in property, plant, and equipment and $60 million in other noncurrent liabilities.

	(Millions)
Cash and cash equivalents	$	23
Trade accounts and other receivables	33
Other current assets	26
Investments	20
Property, plant, and equipment – net	1,019
Other noncurrent assets	33
Total identifiable assets acquired	$	1,154
Current liabilities	$	(47)
Long-term debt (Note 12)	(365)
Other noncurrent liabilities	(95)
Total liabilities assumed	$	(507)
Net identifiable assets acquired	$	647
Goodwill included in Intangible assets – net of accumulated amortization	400
Net assets acquired	$	1,047

Trace Midstream Acquisition

Business Acquisition [Line Items]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

We accounted for the Trace Acquisition as a business combination. The following table presents the allocation of the acquisition date fair value of the major classes of the assets acquired, which are presented in our West segment, and liabilities assumed at April 29, 2022. The fair value of accounts receivable acquired equals contractual amounts receivable. The valuation techniques used consisted of the income approach for valuation of intangible assets and the cost approach for property, plant, and equipment.

	(Millions)
Cash and cash equivalents	$	39
Trade accounts and other receivables	18
Property, plant, and equipment – net	448
Intangible assets – net of accumulated amortization	472
Other noncurrent assets	20
Total assets acquired	$	997
Accounts payable	$	(12)
Accrued and other current liabilities	(5)
Other noncurrent liabilities	(8)
Total liabilities assumed	$	(25)
Net assets acquired	$	972

Sequent Acquisition

Business Acquisition [Line Items]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

We accounted for the Sequent Acquisition as a business combination. The following table presents the allocation of the acquisition date fair value of the major classes of the assets acquired, which are presented in our Gas & NGL Marketing Services segment, and liabilities assumed at July 1, 2021. The fair value of accounts receivable acquired equals contractual amounts receivable. The fair value of the intangible assets was measured using an income approach. The fair value of the inventory acquired was based on the market price of the natural gas in underground storage at the acquisition date. See Note 15 – Fair Value Measurements, Guarantees, and Concentration of Credit Risk for the valuation techniques used to measure fair value of commodity derivative assets and liabilities.

	(Millions)
Cash and cash equivalents	$	8
Trade accounts and other receivables	498
Inventories	121
Derivative assets	57
Other current assets and deferred charges	4
Property, plant, and equipment – net	5
Intangible assets – net of accumulated amortization	306
Other noncurrent assets	3
Commodity derivatives included in other noncurrent assets	49
Total assets acquired	$	1,051
Accounts payable	$	(514)
Derivative liabilities	(116)
Accrued and other current liabilities	(46)
Other noncurrent liabilities	(1)
Commodity derivatives included in other noncurrent liabilities	(215)
Total liabilities assumed	$	(892)
Net assets acquired	$	159