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Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Regulatory Assets [Line Items] |  |
Regulatory Assets | $ 837 | $ 713
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 506 |
Regulatory Liabilities | 1,493 | 1,446
Deferred Purchased Power Costs | 78 | 5
Removal Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
Regulatory Liabilities | 1,199 | 1,173
Deferred Income Tax Charge [Member] |  |
Regulatory Assets [Line Items] |  |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
Regulatory Liabilities | 179 | 177
Asset Retirement Obligation Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Liabilities | 7 | 4
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets [Line Items] |  |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 13 |
Regulatory Liabilities | 75 | 96
Regulatory Assets Earning a Rate of Return at the Approved Rate | 62 |
RemainingAmountsOfRegulatoryLiabilitesForWhichNoInterstAccruesDuringRecoveryPeriodIsProvided | 13 |
Earning a return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Liabilities | 1,480 |
Revenue Subject to Refund [Member] |  |
Regulatory Assets [Line Items] |  |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
Regulatory Liabilities | 40 | 0
Other Regulatory Assets Earning a Return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 70 |
Earning a return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 331 |
Deferred Derivative Gain (Loss) [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 0 | 206
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 185 |
Pension and Other Postretirement Plans Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 0 | 104
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 84 |
Environmental Restoration Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 0 |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 161 | 139
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 146 | 140
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 76 |
February2021IceStormAndDamageDeferral |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 58 | 67
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
2020LaborDayWildfireDeferral |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 24 | 28
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
Wildfire mitigation |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 43 | 29
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
January2024icestormanddamage |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 46 | 0
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
Reliabilitycontingencyevent |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 90 | $ 0
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | $ 0 |

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- Definition Regulatory assets earning a rate of return at the approved rate. + References No definition available. + Details
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- Definition Costs of power used for operations in prior periods that were expected to be recovered from customers in future periods. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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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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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory 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 Remaining balance of regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 55 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478098/980-340-55-2 + Details
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