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v3.26.1

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

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