Revenue by Category (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 12,632	$ 11,996	$ 17,773
Revenue Not from Contract with Customer, Other	[1]	2,348	4,537	7,935
Revenues Adjustments For Certain Risk Management Activities Costs	[2]	(4,477)	(5,626)	(14,743)
Total revenues		10,503	10,907	10,965
Regulated Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3,419	3,274	3,067
NonRegulated Service Monetary Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3,970	3,533	3,258
NonRegulated Service Commodity Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		134	146	260
Total revenues		134	146	260
Other Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		140	115	122
Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		7,663	7,068	6,707
Total revenues		7,628	7,026	6,536
Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,969	4,928	11,066
Total revenues		2,991	2,779	4,556
Operating Segments [Member] | Transmission And Gulf Of America [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,589	4,097	4,009
Revenue Not from Contract with Customer, Other	[1]	39	53	38
Revenues Adjustments For Certain Risk Management Activities Costs	[2]	0	0	0
Total revenues		4,628	4,150	4,047
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Regulated Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3,500	3,334	3,139
Operating Segments [Member] | Transmission And Gulf Of America [Member] | NonRegulated Service Monetary Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		661	443	381
Operating Segments [Member] | Transmission And Gulf Of America [Member] | NonRegulated Service Commodity Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		54	38	64
Total revenues		54	38	64
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Other Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		46	30	21
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,261	3,845	3,605
Total revenues		4,246	3,858	3,579
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		328	252	404
Total revenues		328	252	404
Operating Segments [Member] | Northeast G And P [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,982	2,006	1,776
Revenue Not from Contract with Customer, Other	[1]	43	27	26
Revenues Adjustments For Certain Risk Management Activities Costs	[2]	0	0	0
Total revenues		2,025	2,033	1,802
Operating Segments [Member] | Northeast G And P [Member] | Regulated Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Operating Segments [Member] | Northeast G And P [Member] | NonRegulated Service Monetary Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,778	1,782	1,526
Operating Segments [Member] | Northeast G And P [Member] | NonRegulated Service Commodity Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2	5	14
Total revenues		2	5	14
Operating Segments [Member] | Northeast G And P [Member] | Other Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		92	87	102
Operating Segments [Member] | Northeast G And P [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,872	1,874	1,642
Total revenues		1,913	1,896	1,654
Operating Segments [Member] | Northeast G And P [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		110	132	134
Total revenues		110	132	134
Operating Segments [Member] | West [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,661	2,034	2,553
Revenue Not from Contract with Customer, Other	[1]	8	101	8
Revenues Adjustments For Certain Risk Management Activities Costs	[2]	0	0	0
Total revenues		2,669	2,135	2,561
Operating Segments [Member] | West [Member] | Regulated Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Operating Segments [Member] | West [Member] | NonRegulated Service Monetary Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,693	1,478	1,518
Operating Segments [Member] | West [Member] | NonRegulated Service Commodity Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		78	103	182
Total revenues		78	103	182
Operating Segments [Member] | West [Member] | Other Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		21	12	12
Operating Segments [Member] | West [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		1,792	1,593	1,712
Total revenues		1,718	1,502	1,542
Operating Segments [Member] | West [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		869	441	841
Total revenues		869	441	841
Operating Segments [Member] | Gas & NGL Marketing Services
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,530	4,616	10,771
Revenue Not from Contract with Customer, Other	[1]	2,236	4,294	7,929
Revenues Adjustments For Certain Risk Management Activities Costs	[2]	(4,977)	(6,032)	(15,467)
Total revenues	[3]	1,789	2,878	3,233
Operating Segments [Member] | Gas & NGL Marketing Services | Regulated Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Operating Segments [Member] | Gas & NGL Marketing Services | NonRegulated Service Monetary Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Operating Segments [Member] | Gas & NGL Marketing Services | NonRegulated Service Commodity Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Total revenues	[3]	0	0	0
Operating Segments [Member] | Gas & NGL Marketing Services | Other Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	1	3
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	1	3
Total revenues	[3]	0	1	3
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		4,530	4,615	10,768
Total revenues	[3]	2,052	2,060	3,534
Corporate, Non-Segment | Other Operating Segment
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		420	442	706
Revenue Not from Contract with Customer, Other	[1]	24	64	(55)
Revenues Adjustments For Certain Risk Management Activities Costs	[2]	0	0	0
Total revenues		444	506	651
Corporate, Non-Segment | Other Operating Segment | Regulated Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Corporate, Non-Segment | Other Operating Segment | NonRegulated Service Monetary Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Corporate, Non-Segment | Other Operating Segment | NonRegulated Service Commodity Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Corporate, Non-Segment | Other Operating Segment | Other Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Corporate, Non-Segment | Other Operating Segment | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Corporate, Non-Segment | Other Operating Segment | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		420	442	706
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		(1,550)	(1,199)	(2,042)
Revenue Not from Contract with Customer, Other	[1]	(2)	(2)	(11)
Revenues Adjustments For Certain Risk Management Activities Costs	[2]	500	406	724
Total revenues		(1,052)	(795)	(1,329)
Intersegment Eliminations [Member] | Regulated Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		(81)	(60)	(72)
Intersegment Eliminations [Member] | NonRegulated Service Monetary Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		(162)	(170)	(167)
Intersegment Eliminations [Member] | NonRegulated Service Commodity Consideration [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0
Intersegment Eliminations [Member] | Other Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		(19)	(15)	(16)
Intersegment Eliminations [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		(262)	(245)	(255)
Intersegment Eliminations [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ (1,288)	$ (954)	$ (1,787)

[1] Revenues not derived from contracts with customers primarily consist of physical product sales related to commodity derivative contracts, realized and unrealized gains and losses associated with Williams’ commodity derivative contracts, which are reported in Net gain (loss) from commodity derivatives in the Consolidated Statement of Income, management fees received for certain services provided to operated equity-method investments, and leasing revenues associated with the Williams headquarters building.

[2] Other adjustments reflect certain costs of Gas & NGL Marketing Services’ risk management activities. As Williams is acting as agent for natural gas marketing customers or engages in energy trading activities, the resulting revenues are presented net of the related costs of those activities in the Consolidated Statement of Income.

[3] As Williams is acting as agent for natural gas marketing customers or engages in energy trading activities, the resulting revenues are presented net of the related costs of those activities.