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Balance Sheet (Unaudited) - Transco - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets, Current [Abstract]    
Cash and cash equivalents $ 70 $ 60
Inventory, Net 339 279
Other current assets and deferred charges 225 192
Current assets 2,271 2,661
Property, Plant and Equipment, Gross 60,305 57,395
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (19,920) (18,703)
Property, Plant and Equipment, Net 40,385 38,692
Other Assets, Noncurrent 1,888 1,830
Total assets 55,736 54,532
Liabilities, Current [Abstract]    
Accounts payable 1,406 1,613
Other current liabilities 1,472 1,360
Total current liabilities 5,377 5,312
Contingent liabilities and commitments
Members' Equity [Abstract]    
Retained Earnings (Accumulated Deficit) (12,354) (12,396)
Total liabilities and equity 55,736 54,532
Transcontinental Gas Pipe Line Company, LLC [Member]    
Assets, Current [Abstract]    
Cash and cash equivalents 0 0
Accounts and Other Receivables, Net, Current 18 12
Inventory, Net 87 81
Regulatory Assets, Current 121 74
Other current assets and deferred charges 19 24
Current assets 1,022 1,103
Property, Plant and Equipment, Gross 20,650 20,044
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (6,299) (5,941)
Property, Plant and Equipment, Net 14,351 14,103
Regulatory Assets, Noncurrent 269 320
Other Assets, Noncurrent 478 405
Total assets 16,120 15,931
Liabilities, Current [Abstract]    
Accounts Payable, Trade, Current 224 258
Regulatory Liability, Current 80 58
Interest Payable, Current 50 76
Accrual for Taxes Other than Income Taxes, Current 61 27
Customer Refund Liability, Current 123 0
Other current liabilities 93 78
Asset Retirement Obligation, Current 42 22
Long-Term Debt, Current Maturities 1,044 35
Total current liabilities 1,765 609
Long-Term Debt, Excluding Current Maturities 4,170 5,200
Regulatory Liabilities, Noncurrent 920 976
Asset Retirement Obligations, Noncurrent 568 593
Other Liabilities, Noncurrent 254 248
Contingent liabilities and commitments
Members' Equity [Abstract]    
Members' Capital 5,088 5,088
Retained Earnings (Accumulated Deficit) 3,355 3,217
Total Members' Equity 8,443 8,305
Total liabilities and equity 16,120 15,931
Transcontinental Gas Pipe Line Company, LLC [Member] | Related Party    
Assets, Current [Abstract]    
Accounts and Financing Receivable, after Allowance for Credit Loss, Current 498 638
Accounts Receivable, after Allowance for Credit Loss, Current 7 24
Liabilities, Current [Abstract]    
Accounts payable 48 55
Transcontinental Gas Pipe Line Company, LLC [Member] | Nonrelated Party    
Assets, Current [Abstract]    
Accounts Receivable, after Allowance for Credit Loss, Current $ 272 $ 250