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Balance Sheet (Unaudited) - NWP - 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
Northwest Pipeline LLC [Member]    
Assets, Current [Abstract]    
Cash and cash equivalents 0 0
Accounts and Other Receivables, Net, Current 1 2
Inventory, Net 9 9
Regulatory Assets, Current 3 6
Other current assets and deferred charges 4 6
Current assets 124 62
Property, Plant and Equipment, Gross 4,392 4,218
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (2,153) (2,089)
Property, Plant and Equipment, Net 2,239 2,129
Regulatory Assets, Noncurrent 71 49
Other Assets, Noncurrent 32 29
Total assets 2,466 2,269
Liabilities, Current [Abstract]    
Accounts Payable, Trade, Current 66 48
Regulatory Liability, Current 20 20
Gas Purchase Payable, Current 3 10
Interest Payable, Current 12 6
Other current liabilities 22 18
Long-Term Debt, Current Maturities 85 85
Total current liabilities 217 225
Long-Term Debt, Excluding Current Maturities 498 497
Regulatory Liabilities, Noncurrent 223 233
Asset Retirement Obligations, Noncurrent 150 144
Other Liabilities, Noncurrent 5 7
Contingent liabilities and commitments
Members' Equity [Abstract]    
Members' Capital 1,255 1,074
Retained Earnings (Accumulated Deficit) 118 89
Total Members' Equity 1,373 1,163
Total liabilities and equity 2,466 2,269
Northwest Pipeline LLC [Member] | Related Party    
Assets, Current [Abstract]    
Accounts and Financing Receivable, after Allowance for Credit Loss, Current 70 0
Accounts Receivable, after Allowance for Credit Loss, Current 0 0
Liabilities, Current [Abstract]    
Accounts payable 9 12
Northwest Pipeline LLC [Member] | Nonrelated Party    
Assets, Current [Abstract]    
Accounts Receivable, after Allowance for Credit Loss, Current 37 39
Northwest Pipeline LLC [Member] | Affiliated Entity    
Liabilities, Current [Abstract]    
Accounts payable $ 0 $ 26