Property, Plant, and Equipment (Details PPE) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant, and Equipment
Property, plant, and equipment, at cost		$ 57,395	$ 51,842
Accumulated depreciation and amortization		(18,703)	(17,531)
Property, plant, and equipment - net		38,692	34,311
Depreciation and amortization expenses		1,800	1,700	$ 1,500
Interest Costs Capitalized		68	54	20
Finite-Lived Intangible Assets, Gross		10,512	10,510
Transcontinental Gas Pipe Line Company, LLC [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		20,044	19,293
Accumulated depreciation and amortization		(5,941)	(5,963)
Property, plant, and equipment - net		14,103	13,330
Finite-Lived Intangible Assets, Gross		1,500
Transcontinental Gas Pipe Line Company, LLC [Member] | Onshore Transmission Facilities
Property, Plant, and Equipment
Property, plant, and equipment, at cost		17,242	16,031
Transcontinental Gas Pipe Line Company, LLC [Member] | Offshore Transmission Facilities
Property, Plant, and Equipment
Property, plant, and equipment, at cost		$ 659	681
Property, Plant, and Equipment, Depreciation Rate	[1]	1.25%
Transcontinental Gas Pipe Line Company, LLC [Member] | Storage Facilities
Property, Plant, and Equipment
Property, plant, and equipment, at cost		$ 948	830
Transcontinental Gas Pipe Line Company, LLC [Member] | Gathering Facilities
Property, Plant, and Equipment
Property, plant, and equipment, at cost		136	158
Northwest Pipeline LLC [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		4,218	3,975
Accumulated depreciation and amortization		(2,089)	(2,026)
Property, plant, and equipment - net		2,129	1,949
Depreciation and amortization expenses		111	111	$ 114
Northwest Pipeline LLC [Member] | Storage Facilities
Property, Plant, and Equipment
Property, plant, and equipment, at cost		160	155
Construction in Progress [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		420	1,008
Construction in Progress [Member] | Northwest Pipeline LLC [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		66	85
Other Capitalized Property Plant and Equipment [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		639	585
Other Capitalized Property Plant and Equipment [Member] | Northwest Pipeline LLC [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		171	165
Natural gas transmission facilities [Member] | Northwest Pipeline LLC [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		3,821	3,570
Nonregulated [Member] | Natural gas gathering and processing facilities [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		23,134	21,357
Nonregulated [Member] | Construction in Progress [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		1,543	1,138
Nonregulated [Member] | Oil and Gas Properties
Property, Plant, and Equipment
Property, plant, and equipment, at cost		1,685	1,111
Nonregulated [Member] | Other Capitalized Property Plant and Equipment [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		4,798	3,268
Regulated [Member] | Construction in Progress [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		542	1,124
Regulated [Member] | Other Capitalized Property Plant and Equipment [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		2,930	2,761
Regulated [Member] | Natural gas transmission facilities [Member]
Property, Plant, and Equipment
Property, plant, and equipment, at cost		22,763	21,083
Regulated [Member] | Acquisition Adjustment Of Regulated Facilities [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Plant Acquisition Adjustments for Intangible Utility Plants		$ 354	$ 389
Period of straight-line amortization		40 years
Minimum [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] | Onshore Transmission Facilities
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	2.50%
Minimum [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] | Storage Facilities
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	1.86%
Minimum [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] | Gathering Facilities
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	0.00%
Minimum [Member] | Northwest Pipeline LLC [Member] | Storage Facilities
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	1.60%
Minimum [Member] | Other Capitalized Property Plant and Equipment [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	1.77%
Minimum [Member] | Other Capitalized Property Plant and Equipment [Member] | Northwest Pipeline LLC [Member]
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	0.00%
Minimum [Member] | Natural gas transmission facilities [Member] | Northwest Pipeline LLC [Member]
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	2.70%
Minimum [Member] | Nonregulated [Member] | Natural gas gathering and processing facilities [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life	[1]	5 years
Minimum [Member] | Nonregulated [Member] | Other Capitalized Property Plant and Equipment [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life	[1]	0 years
Minimum [Member] | Regulated [Member] | Other Capitalized Property Plant and Equipment [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life	[1]	5 years
Property, Plant, and Equipment, Depreciation Rate	[1]	0.00%
Minimum [Member] | Regulated [Member] | Natural gas transmission facilities [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life	[1]	0 years
Property, Plant, and Equipment, Depreciation Rate	[1]	1.25%
Maximum [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] | Onshore Transmission Facilities
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	7.13%
Maximum [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] | Storage Facilities
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	2.05%
Maximum [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] | Gathering Facilities
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	1.00%
Maximum [Member] | Northwest Pipeline LLC [Member] | Storage Facilities
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	2.76%
Maximum [Member] | Other Capitalized Property Plant and Equipment [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	20.00%
Maximum [Member] | Other Capitalized Property Plant and Equipment [Member] | Northwest Pipeline LLC [Member]
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	33.33%
Maximum [Member] | Natural gas transmission facilities [Member] | Northwest Pipeline LLC [Member]
Property, Plant, and Equipment
Property, Plant, and Equipment, Depreciation Rate	[1]	10.20%
Maximum [Member] | Nonregulated [Member] | Natural gas gathering and processing facilities [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life	[1]	40 years
Maximum [Member] | Nonregulated [Member] | Other Capitalized Property Plant and Equipment [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life	[1]	45 years
Maximum [Member] | Regulated [Member] | Other Capitalized Property Plant and Equipment [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life	[1]	45 years
Property, Plant, and Equipment, Depreciation Rate	[1]	33.33%
Maximum [Member] | Regulated [Member] | Natural gas transmission facilities [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life	[1]	25 years
Property, Plant, and Equipment, Depreciation Rate	[1]	10.20%

[1] Estimated useful life and depreciation rates are presented as of December 31, 2024. Depreciation rates and estimated useful lives for regulated assets are prescribed by the FERC.