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Balance Sheet (Unaudited) - Transco - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets, Current [Abstract]    
Cash and cash equivalents $ 203 $ 63
Inventory, Net 335 314
Other current assets and deferred charges 398 256
Current assets 3,123 3,244
Property, plant, and equipment 65,278 62,010
Accumulated depreciation, depletion, and amortization (20,868) (20,014)
Property, plant, and equipment – net 44,410 41,996
Other Assets, Noncurrent 1,985 2,011
Total assets 60,610 58,573
Liabilities, Current [Abstract]    
Accounts payable 2,220 2,224
Other current liabilities 1,518 1,639
Total current liabilities 6,546 6,106
Contingent liabilities and commitments
Members' Equity [Abstract]    
Retained Earnings (Accumulated Deficit) (11,834) (12,237)
Total liabilities and equity 60,610 58,573
Transcontinental Gas Pipe Line Company, LLC [Member]    
Assets, Current [Abstract]    
Cash and cash equivalents 0 0
Other Receivables, Net, Current 42 23
Inventory, Net 97 82
Regulatory Assets, Current 146 126
Other current assets and deferred charges 32 24
Current assets 1,487 1,522
Property, plant, and equipment 21,562 21,012
Accumulated depreciation, depletion, and amortization (6,580) (6,404)
Property, plant, and equipment – net 14,982 14,608
Regulatory Assets, Noncurrent 245 268
Other Assets, Noncurrent 472 466
Total assets 17,186 16,864
Liabilities, Current [Abstract]    
Accounts Payable, Trade, Current 351 225
Regulatory Liability, Current 106 93
Interest Payable, Current 69 53
Customer Refund Liability, Current 0 179
Accrued Liabilities and Other Liabilities 0 75
Other current liabilities 204 143
Asset Retirement Obligation, Current 57 41
Long-Term Debt, Current Maturities 247 246
Total current liabilities 1,082 1,117
Long-Term Debt, Excluding Current Maturities 5,643 5,642
Regulatory Liabilities, Noncurrent 905 914
Asset Retirement Obligations, Noncurrent 548 573
Other Liabilities, Noncurrent 287 227
Contingent liabilities and commitments
Members' Equity [Abstract]    
Members' Capital 5,363 5,088
Retained Earnings (Accumulated Deficit) 3,358 3,303
Total Members' Equity 8,721 8,391
Total liabilities and equity 17,186 16,864
Transcontinental Gas Pipe Line Company, LLC [Member] | Related Party    
Assets, Current [Abstract]    
Accounts and Financing Receivable, after Allowance for Credit Loss, Current 900 954
Accounts Receivable, after Allowance for Credit Loss, Current 10 7
Liabilities, Current [Abstract]    
Accounts payable 48 62
Transcontinental Gas Pipe Line Company, LLC [Member] | Nonrelated Party    
Assets, Current [Abstract]    
Accounts Receivable, after Allowance for Credit Loss, Current $ 260 $ 306