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Regulatory Matters - Schedule of Decoupling and Earnings Sharing Mechanisms (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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WASHINGTON | Decoupling Surcharge [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory assets | $ 18 |
WASHINGTON | Decoupling Rebate [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory Liabilities |  | $ (3)
IDAHO | Decoupling Surcharge [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory assets | 1 |
IDAHO | Revenue Subject to Refund [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory Liabilities | 0 | (1)
IDAHO | Decoupling Rebate [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory Liabilities |  | (8)
OREGON | Decoupling Surcharge [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory assets | $ 1 |
OREGON | Decoupling Rebate [Member] |  |
Schedule of Decoupling and Earnings Sharing [Line Items] |  |
Regulatory Liabilities |  | $ (4)

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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