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Statement of Net Income (Unaudited) - NWP - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenues [Abstract]        
Revenues $ 3,053 $ 2,781 $ 6,083 $ 5,829
Costs and Expenses [Abstract]        
Operating Costs and Expenses 597 572 1,162 1,114
Depreciation, depletion, and amortization 592 605 1,176 1,190
General and Administrative Expense 180 168 373 362
Other Operating Income (Expense), Net (1) 13 (10) 3
Total costs and expenses 1,871 1,836 3,580 3,790
Operating income (loss) 1,182 945 2,503 2,039
Interest expense (371) (350) (747) (699)
Other Nonoperating Income (Expense) 32 16 58 30
Net income (loss) 1,136 757 2,292 1,679
Northwest Pipeline LLC [Member]        
Revenues [Abstract]        
Revenues 118 113 238 224
Costs and Expenses [Abstract]        
Depreciation, depletion, and amortization 31 30 61 59
Taxes, Miscellaneous 4 4 8 8
Other Operating Income (Expense), Net (5) (4) (10) (10)
Total costs and expenses 71 65 136 126
Operating income (loss) 47 48 102 98
Interest expense (9) (7) (17) (14)
Public Utilities, Allowance for Funds Used During Construction, Additions 4 2 6 4
Other Nonoperating Income (Expense) 1 1 1 1
Net income (loss) 47 45 99 91
Northwest Pipeline LLC [Member] | Related Party        
Costs and Expenses [Abstract]        
Operating Costs and Expenses 14 11 28 25
General and Administrative Expense 10 10 20 20
Interest Income, Other 2 1 4 1
Northwest Pipeline LLC [Member] | Nonrelated Party        
Costs and Expenses [Abstract]        
Operating Costs and Expenses 15 13 24 20
General and Administrative Expense 2 1 5 4
Interest Income, Other 2 0 3 1
Northwest Pipeline LLC [Member] | Natural Gas, US Regulated        
Revenues [Abstract]        
Revenues 112 107 226 212
Northwest Pipeline LLC [Member] | Natural Gas, Storage        
Revenues [Abstract]        
Revenues 3 4 7 8
Northwest Pipeline LLC [Member] | Product and Service, Other        
Revenues [Abstract]        
Revenues $ 3 $ 2 $ 5 $ 4