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Regulatory Matters - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Regulated Asset Liability [Line Items] |  |
Threshold limit of deadband and sharing bands for future surcharge or rebate to customer | $ 4 |
Threshold to return washington energy recovery mechanism dollars to customers | $ 30 |
Proposed cumulative rebate refund period | 2 years |
Deferred natural gas costs, asset |  | $ 52
Deferred natural gas costs, liability | $ 25 |
WASHINGTON |  |
Regulated Asset Liability [Line Items] |  |
Decoupling maximum rate increase request | 3.00% |
WASHINGTON | Power Deferrals Regulatory Asset [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | $ 36 | 38
IDAHO | Power Deferrals Regulatory Asset [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets |  | 8
Regulatory liabilities | 15 |
Revenue Subject to Refund [Member] | IDAHO |  |
Regulated Asset Liability [Line Items] |  |
Regulatory liabilities | $ 0 | $ 1

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