Fair Value Measurements and Guarantees Recurring Measurements and Additional (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Additional disclosures:
Derivative, Notional Amount		$ 350	$ 1,150
Derivative, Additional Notional Amount		950
Derivative Notional Amount Terminated		1,750
Energy Related Derivative
Measured on a recurring basis
Derivative Asset		344	314
Derivative Liability		(400)	(287)
Carrying Amount [Member]
Additional disclosures:
Long-term debt, including current portion		(26,456)	(25,713)
Guarantees		(36)	(37)
Carrying Amount [Member] | Gulf Coast Storage Acquisition
Additional disclosures:
Long-term debt, including current portion		(100)
Carrying Amount [Member] | RMM Acquisition
Additional disclosures:
Long-term debt, including current portion			(665)
Carrying Amount [Member] | Williams Companies Inc [Member]
Additional disclosures:
Long-term debt, including current portion		(20,167)	(18,837)
Carrying Amount [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Additional disclosures:
Long-term debt, including current portion		(5,235)	(5,261)
Carrying Amount [Member] | Northwest Pipeline LLC [Member]
Additional disclosures:
Long-term debt, including current portion		(582)	(581)
Carrying Amount [Member] | MountainWest [Member]
Additional disclosures:
Long-term debt, including current portion		(372)	(369)
Fair Value [Member]
Additional disclosures:
Long-term debt, including current portion		(25,830)	(25,553)
Guarantees		(28)	(28)
Fair Value [Member] | Gulf Coast Storage Acquisition
Additional disclosures:
Long-term debt, including current portion		(100)
Fair Value [Member] | RMM Acquisition
Additional disclosures:
Long-term debt, including current portion			(665)
Fair Value [Member] | Williams Companies Inc [Member]
Additional disclosures:
Long-term debt, including current portion		(19,517)	(18,494)
Fair Value [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Additional disclosures:
Long-term debt, including current portion		(5,276)	(5,438)
Fair Value [Member] | Northwest Pipeline LLC [Member]
Additional disclosures:
Long-term debt, including current portion		(573)	(581)
Fair Value [Member] | MountainWest [Member]
Additional disclosures:
Long-term debt, including current portion		(364)	(375)
Level 1 [Member]
Additional disclosures:
Long-term debt, including current portion		0	0
Guarantees		0	0
Level 1 [Member] | Gulf Coast Storage Acquisition
Additional disclosures:
Long-term debt, including current portion		0
Level 1 [Member] | RMM Acquisition
Additional disclosures:
Long-term debt, including current portion			0
Level 1 [Member] | Williams Companies Inc [Member]
Additional disclosures:
Long-term debt, including current portion		0	0
Level 1 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Additional disclosures:
Long-term debt, including current portion		0	0
Level 1 [Member] | Northwest Pipeline LLC [Member]
Additional disclosures:
Long-term debt, including current portion		0	0
Level 1 [Member] | MountainWest [Member]
Additional disclosures:
Long-term debt, including current portion		0	0
Level 2 [Member]
Additional disclosures:
Long-term debt, including current portion		(25,830)	(25,553)
Guarantees		(12)	(12)
Level 2 [Member] | Gulf Coast Storage Acquisition
Additional disclosures:
Long-term debt, including current portion		(100)
Level 2 [Member] | RMM Acquisition
Additional disclosures:
Long-term debt, including current portion			(665)
Level 2 [Member] | Williams Companies Inc [Member]
Additional disclosures:
Long-term debt, including current portion		(19,517)	(18,494)
Level 2 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Additional disclosures:
Long-term debt, including current portion		(5,276)	(5,438)
Level 2 [Member] | Northwest Pipeline LLC [Member]
Additional disclosures:
Long-term debt, including current portion		(573)	(581)
Level 2 [Member] | MountainWest [Member]
Additional disclosures:
Long-term debt, including current portion		(364)	(375)
Level 3 [Member]
Additional disclosures:
Long-term debt, including current portion		0	0
Guarantees		(16)	(16)
Level 3 [Member] | Gulf Coast Storage Acquisition
Additional disclosures:
Long-term debt, including current portion		0
Level 3 [Member] | RMM Acquisition
Additional disclosures:
Long-term debt, including current portion			0
Level 3 [Member] | Williams Companies Inc [Member]
Additional disclosures:
Long-term debt, including current portion		0	0
Level 3 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Additional disclosures:
Long-term debt, including current portion		0	0
Level 3 [Member] | Northwest Pipeline LLC [Member]
Additional disclosures:
Long-term debt, including current portion		0	0
Level 3 [Member] | MountainWest [Member]
Additional disclosures:
Long-term debt, including current portion		0	0
Fair Value, Recurring [Member] | Carrying Amount [Member]
Measured on a recurring basis
Interest Rate Derivatives, at Fair Value, Net			6
Fair Value, Recurring [Member] | Carrying Amount [Member] | Energy Related Derivative
Measured on a recurring basis
Derivative Asset	[1]	344	314
Derivative Liability	[1]	(400)	(287)
Fair Value, Recurring [Member] | Carrying Amount [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Measured on a recurring basis
ARO Trust investments		297	269
Fair Value, Recurring [Member] | Fair Value [Member]
Measured on a recurring basis
Derivative Asset, Fair Value, Gross Asset		726	866	[2]
Derivative Liability, Fair Value, Gross Liability		(1,070)	(841)	[2]
Interest Rate Derivatives, at Fair Value, Net			6
Fair Value, Recurring [Member] | Fair Value [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Measured on a recurring basis
ARO Trust investments		297	269
Fair Value, Recurring [Member] | Level 1 [Member]
Measured on a recurring basis
Derivative Asset, Fair Value, Gross Asset		427	514	[2]
Derivative Liability, Fair Value, Gross Liability		(532)	(376)	[2]
Interest Rate Derivatives, at Fair Value, Net			0
Fair Value, Recurring [Member] | Level 1 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Measured on a recurring basis
ARO Trust investments		297	269
Fair Value, Recurring [Member] | Level 2 [Member]
Measured on a recurring basis
Derivative Asset, Fair Value, Gross Asset		188	196	[2]
Derivative Liability, Fair Value, Gross Liability		(475)	(362)	[2]
Interest Rate Derivatives, at Fair Value, Net			6
Fair Value, Recurring [Member] | Level 2 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Measured on a recurring basis
ARO Trust investments		0	0
Fair Value, Recurring [Member] | Level 3 [Member]
Measured on a recurring basis
Derivative Asset, Fair Value, Gross Asset		111	156	[2]
Derivative Liability, Fair Value, Gross Liability		(63)	(103)	[2]
Interest Rate Derivatives, at Fair Value, Net			0
Fair Value, Recurring [Member] | Level 3 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Measured on a recurring basis
ARO Trust investments		0	$ 0
Wiltel Guarantee [Member]
Additional disclosures:
Guarantor Obligations, Maximum Exposure, Undiscounted		22
Indemnification Agreement [Member] | Carrying Amount [Member]
Additional disclosures:
Guarantees		$ 0

[1] The carrying amount is presented net of counterparty offsetting arrangements and collateral (see Note 17 – Commodity Derivatives).

[2] Previously, the fair value of Williams’ commodity derivative assets and liabilities were disclosed by level within the fair value hierarchy net of counterparty offsetting arrangements. The December 31, 2023, amounts have been corrected to disclose the fair values by level on a gross basis, as presented above.