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Balance Sheet (Unaudited) - NWP - 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
Northwest Pipeline LLC [Member]    
Assets, Current [Abstract]    
Cash and cash equivalents 0 0
Other Receivables, Net, Current 8 1
Inventory, Net 10 9
Regulatory Assets, Current 4 3
Other current assets and deferred charges 4 8
Current assets 277 280
Property, plant, and equipment 4,542 4,434
Accumulated depreciation, depletion, and amortization (2,243) (2,164)
Property, plant, and equipment – net 2,299 2,270
Regulatory Assets, Noncurrent 92 80
Other Assets, Noncurrent 34 30
Total assets 2,702 2,660
Liabilities, Current [Abstract]    
Accounts Payable, Trade, Current 48 39
Regulatory Liability, Current 20 20
Other current liabilities 39 32
Long-Term Debt, Current Maturities 499 0
Total current liabilities 619 103
Long-Term Debt, Excluding Current Maturities 250 748
Regulatory Liabilities, Noncurrent 198 225
Asset Retirement Obligations, Noncurrent 156 152
Other Liabilities, Noncurrent 9 5
Contingent liabilities and commitments
Members' Equity [Abstract]    
Members' Capital 1,328 1,305
Retained Earnings (Accumulated Deficit) 142 122
Total Members' Equity 1,470 1,427
Total liabilities and equity 2,702 2,660
Northwest Pipeline LLC [Member] | Related Party    
Assets, Current [Abstract]    
Accounts and Financing Receivable, after Allowance for Credit Loss, Current 212 218
Liabilities, Current [Abstract]    
Accounts payable 13 12
Northwest Pipeline LLC [Member] | Nonrelated Party    
Assets, Current [Abstract]    
Accounts Receivable, after Allowance for Credit Loss, Current $ 39 $ 41