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Statement of Net Income (Unaudited) - NWP - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues [Abstract]        
Revenues $ 2,923 $ 2,653 $ 8,752 $ 7,760
Costs and Expenses [Abstract]        
Depreciation, depletion, and amortization 564 566 1,754 1,654
Other Operating Income (Expense), Net 14 (25) 17 (69)
Total costs and expenses 1,814 1,815 5,604 5,214
Operating income (loss) 1,109 838 3,148 2,546
Interest expense (372) (338) (1,071) (1,026)
Other Nonoperating Income (Expense) 21 31 51 95
Net income 647 706 1,884 1,739
Northwest Pipeline LLC [Member]        
Revenues [Abstract]        
Revenues 114 107 338 329
Costs and Expenses [Abstract]        
Utilities Operating Expense, Maintenance and Operations 28 28 73 73
General and Administrative Expense 13 13 37 37
Depreciation, depletion, and amortization 29 28 88 82
Taxes, Miscellaneous 3 4 11 11
Other Operating Income (Expense), Net (6) (5) (16) (14)
Total costs and expenses 67 68 193 189
Operating income (loss) 47 39 145 140
Interest expense (7) (7) (21) (21)
Public Utilities, Allowance for Funds Used During Construction, Additions 3 4 7 8
Other Nonoperating Income (Expense) 1 2 4 7
Net income 44 38 135 134
Natural Gas, US Regulated | Northwest Pipeline LLC [Member]        
Revenues [Abstract]        
Revenues 108 101 320 310
Natural Gas, Storage | Northwest Pipeline LLC [Member]        
Revenues [Abstract]        
Revenues 3 3 11 11
Product and Service, Other | Northwest Pipeline LLC [Member]        
Revenues [Abstract]        
Revenues $ 3 $ 3 $ 7 $ 8