Acquisitions (Details) - USD ($) $ in Millions					1 Months Ended	3 Months Ended			11 Months Ended	12 Months Ended
		Jan. 03, 2024	Nov. 30, 2023	Feb. 14, 2023	Dec. 31, 2023	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired							$ 1,851	$ 1,056
Revenues							2,771	3,081
Modified EBITDA Earnings Loss							1,837	2,130
Net income (loss) attributable to The Williams Companies, Inc.							632	927
Pro Forma [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue								3,226
Business Acquisition, Pro Forma Net Income (Loss)								952
Operating Segments [Member]
Business Acquisition [Line Items]
Modified EBITDA Earnings Loss							1,761	2,056
Transmission And Gulf Of Mexico [Member] | Operating Segments [Member]
Business Acquisition [Line Items]
Revenues							1,119	1,007
Modified EBITDA Earnings Loss							829	715
West [Member] | Operating Segments [Member]
Business Acquisition [Line Items]
Revenues							701	503
Modified EBITDA Earnings Loss							327	304
Gulf Coast Storage Acquisition
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Consideration Transferred		$ 1,950
Business Combination, Consideration Transferred, Liabilities Incurred		100
Gulf Coast Storage Acquisition | Pro Forma [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue								46
Business Acquisition, Pro Forma Net Income (Loss)								16
Gulf Coast Storage Acquisition | Transmission And Gulf Of Mexico [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		46
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other		18
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		2,042
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets		2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		2,108
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other		(10)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other		(107)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		(117)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		$ 1,991
Gulf Coast Storage Acquisition | Transmission And Gulf Of Mexico [Member] | Selling, general and administrative expenses [Member]
Business Acquisition [Line Items]
Business Combination Acquisition Related Costs Cumulative							11
Business Combination, Acquisition Related Costs							10
Gulf Coast Storage Acquisition | Transmission And Gulf Of Mexico [Member] | Operating Segments [Member]
Business Acquisition [Line Items]
Revenues						$ 53
Modified EBITDA Earnings Loss						$ 39
Cureton Acquisition
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Business Combination, Consideration Transferred			$ 546
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			20 years
Percentage Of Finite Lived Intangible Assets Impacted By Our Intent Or Ability To Renew Or Extend Arrangement			24.00%
Acquired Finite-lived Intangible Asset, Weighted-Average Period before Renewal or Extension			10 years
Cureton Acquisition | West [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			$ 2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other			21
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			437
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			117
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets			4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			581
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other			(25)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other			(16)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			(41)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			540
Goodwill			6
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			546
Cureton Acquisition | West [Member] | Selling, general and administrative expenses [Member]
Business Acquisition [Line Items]
Business Combination Acquisition Related Costs Cumulative							7
Business Combination, Acquisition Related Costs							1
Cureton Acquisition | West [Member] | Operating Segments [Member]
Business Acquisition [Line Items]
Revenues					$ 35
Modified EBITDA Earnings Loss					7
RMM Acquisition
Business Acquisition [Line Items]
Business Combination, Consideration Transferred			704
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value			406
Gain on remeasurement of equity-method investment (Note 2)			$ 30
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			20 years
Percentage Of Finite Lived Intangible Assets Impacted By Our Intent Or Ability To Renew Or Extend Arrangement			18.00%
Acquired Finite-lived Intangible Asset, Weighted-Average Period before Renewal or Extension			10 years
RMM Acquisition | West [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			$ 28
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other			4
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Investments			20
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			1,041
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			63
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets			12
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			1,168
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other			(44)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other			(103)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			(147)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			1,021
Goodwill			55
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			1,076
Business Acquisition, Goodwill, Expected Tax Deductible Amount			$ 55
RMM Acquisition | West [Member] | Rocky Mountain Midstream Holdings LLC [Member]
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage											50.00%
Business Acquisition, Percentage of Voting Interests Acquired			50.00%
RMM Acquisition | West [Member] | Operating Segments [Member]
Business Acquisition [Line Items]
Revenues					53
Modified EBITDA Earnings Loss					$ 12
DJ Basin Acquisitions | Pro Forma [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue								64
Business Acquisition, Pro Forma Net Income (Loss)								3
MountainWestAcquisition
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Business Combination, Consideration Transferred				$ 1,080
Business Combination, Consideration Transferred, Liabilities Incurred				430
Payments to Acquire Businesses, Net of Cash Acquired										$ 1,024
MountainWestAcquisition | Pro Forma [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	[1]							35
Business Acquisition, Pro Forma Net Income (Loss)	[1]							6
MountainWestAcquisition | Transmission And Gulf Of Mexico [Member]
Business Acquisition [Line Items]
Business Combination, Transition Related Costs									$ 27
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents				23
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables				33
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other				26
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Investments				20
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment				1,019
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets				33
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				1,154
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other				(47)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt				(365)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other				(95)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				(507)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net				647
Goodwill				400
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net				1,047
Business Acquisition, Goodwill, Expected Tax Deductible Amount				$ 400
MountainWestAcquisition | Transmission And Gulf Of Mexico [Member] | Selling, general and administrative expenses [Member]
Business Acquisition [Line Items]
Business Combination Acquisition Related Costs Cumulative							$ 17
Business Combination, Acquisition Related Costs								$ 12
MountainWestAcquisition | Transmission And Gulf Of Mexico [Member] | Operating Segments [Member]
Business Acquisition [Line Items]
Revenues									225
Modified EBITDA Earnings Loss									$ 122

[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.