Statement of Net Income - Transco - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues [Abstract]
Revenues	$ 10,503	$ 10,907	$ 10,965
Costs and Expenses [Abstract]
Depreciation and amortization	2,219	2,071	2,009
Other Operating Income (Expense), Net	(60)	(30)	28
Total costs and expenses	7,164	6,596	7,947
Operating income (loss)	3,339	4,311	3,018
Interest Expense, Nonoperating	(1,364)	(1,236)	(1,147)
Other Nonoperating Income (Expense)	108	99	18
Net income	2,225	3,179	2,049
Transcontinental Gas Pipe Line Company, LLC [Member]
Revenues [Abstract]
Revenues	2,964	2,866	2,909
Costs and Expenses [Abstract]
Cost of natural gas sales	118	137	179
Utilities Operating Expense, Maintenance and Operations	510	517	531
General and Administrative Expense	216	215	225
Depreciation and amortization	545	519	513
Taxes, Miscellaneous	111	105	98
Other Operating Income (Expense), Net	(35)	(38)	(7)
Total costs and expenses	1,465	1,455	1,539
Operating income (loss)	1,499	1,411	1,370
Interest Expense, Nonoperating	(324)	(324)	(327)
Interest Income, Other	58	87	36
Public Utilities, Allowance for Funds Used During Construction, Additions	88	77	28
Other Nonoperating Income (Expense)	(8)	(4)	(7)
Net income	1,313	1,247	1,100
Natural Gas, US Regulated | Transcontinental Gas Pipe Line Company, LLC [Member]
Revenues [Abstract]
Revenues	2,619	2,506	2,503
Natural Gas, Storage | Transcontinental Gas Pipe Line Company, LLC [Member]
Revenues [Abstract]
Revenues	200	186	193
Natural Gas, Gathering, Transportation, Marketing and Processing | Transcontinental Gas Pipe Line Company, LLC [Member]
Revenues [Abstract]
Revenues	118	137	179
Product and Service, Other | Transcontinental Gas Pipe Line Company, LLC [Member]
Revenues [Abstract]
Revenues	$ 27	$ 37	$ 34