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Balance Sheet Components - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | $ 122 | $ 137
Regulatory Assets, Non-Current | 851 | 847
Regulatory Liabilities, Current | 108 | 108
Regulatory Liabilities, Non-Current | 843 | 834
Other Income Tax Related Liabilities [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 6 | 5
Regulatory Liabilities, Non-Current | 56 | 59
Excess Deferred Income Taxes [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 14 | 14
Regulatory Liabilities, Non-Current | 273 | 279
Deferred Climate Commitment Act Revenues [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 31 | 44
Regulatory Liabilities, Non-Current | 0 | 0
Deferred Power Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 9 | 8
Regulatory Liabilities, Non-Current | 3 | 6
Deferred Natural Gas Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 34 | 25
Regulatory Liabilities, Non-Current | 0 | 0
Decoupling Rebate [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 0 | 4
Regulatory Liabilities, Non-Current | 6 | 0
Utility Plant Retirement Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 0 | 0
Regulatory Liabilities, Non-Current | 464 | 448
Interest Rate Swaps [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 0 | 0
Regulatory Liabilities, Non-Current | 23 | 24
COVID-19 Deferrals [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 0 | 0
Regulatory Liabilities, Non-Current | 7 | 10
Other Regulatory Liabilities [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 14 | 8
Regulatory Liabilities, Non-Current | 11 | 8
Energy Commodity Derivatives [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 30 | 27
Regulatory Assets, Non-Current | 14 | 14
Deferred Climate Commitment Act Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 19 | 50
Regulatory Assets, Non-Current | 0 | 0
Deferred Power Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 17 | 9
Regulatory Assets, Non-Current | 29 | 27
Decoupling Surcharge [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 17 | 12
Regulatory Assets, Non-Current | 13 | 12
Income Tax Related Assets [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 246 | 246
Pension and Other Postretirement Benefit Plans [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 104 | 106
Interest Rate Swaps [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 169 | 172
AFUDC Above FERC Allowed Rate [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 49 | 49
Settlement with Coeur d'Alene Tribe [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 35 | 36
Advanced Meter Infrastructure [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 25 | 26
Utility Plant Abandoned [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 3 | 4
Regulatory Assets, Non-Current | 38 | 38
COVID-19 Deferrals [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 9 | 12
Demand Side Management Programs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 44 | 38
Other Regulatory Assets [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 36 | 35
Regulatory Assets, Non-Current | $ 76 | $ 71

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + 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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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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