Balance Sheet - Transco - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Assets, Current [Abstract]
Cash and cash equivalents	$ 60	$ 2,150
Inventory, Net	279	274
Other current assets and deferred charges	192	195
Current assets	2,661	4,513
Property, Plant and Equipment, Net	38,692	34,311
Other Assets, Noncurrent	1,830	1,573
Total assets	54,532	52,627
Liabilities, Current [Abstract]
Accounts payable	1,613	1,379
Regulatory Liability, Current	85	77
Other current liabilities	1,360	1,284
Asset Retirement Obligation, Current	91	106
Total current liabilities	5,312	5,830
Contingent liabilities and commitments
Members' Equity [Abstract]
Retained Earnings (Accumulated Deficit)	(12,396)	(12,287)
Total liabilities and equity	54,532	52,627
Transcontinental Gas Pipe Line Company, LLC [Member]
Assets, Current [Abstract]
Cash and cash equivalents	0	0
Accounts and Other Receivables, Net, Current	12	11
Inventory, Net	81	83
Regulatory Assets, Current	74	87
Other current assets and deferred charges	24	14
Current assets	1,103	1,809
Property, Plant and Equipment, Net	14,103	13,330
Regulatory Assets, Noncurrent	320	299
Other Assets, Noncurrent	405	350
Total assets	15,931	15,788
Liabilities, Current [Abstract]
Accounts Payable, Trade, Current	258	278
Regulatory Liability, Current	58	49
Other current liabilities	181	190
Asset Retirement Obligation, Current	22	96
Long-Term Debt, Current Maturities	35	32
Total current liabilities	609	700
Long-Term Debt, Excluding Current Maturities	5,200	5,229
Regulatory Liabilities, Noncurrent	976	956
Asset Retirement Obligations, Noncurrent	593	524
Other Liabilities, Noncurrent	248	242
Contingent liabilities and commitments
Members' Equity [Abstract]
Members' Capital	5,088	5,088
Retained Earnings (Accumulated Deficit)	3,217	3,049
Total Members' Equity	8,305	8,137
Total liabilities and equity	15,931	15,788
Transcontinental Gas Pipe Line Company, LLC [Member] | Related Party
Assets, Current [Abstract]
Accounts and Financing Receivable, after Allowance for Credit Loss, Current	638	1,353
Accounts Receivable, after Allowance for Credit Loss, Current	24	10
Liabilities, Current [Abstract]
Accounts payable	55	55
Transcontinental Gas Pipe Line Company, LLC [Member] | Nonrelated Party
Assets, Current [Abstract]
Accounts Receivable, after Allowance for Credit Loss, Current	$ 250	$ 251