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Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Regulatory Assets [Line Items] |  |
Regulatory Assets | $ 527 | $ 557
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 274 |
Regulatory Liabilities | 1,623 | 1,466
Deferred Purchased Power Costs | 23 | 62
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 | 1,136 | 1,047
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 | 194 | 208
Asset Retirement Obligation 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 | 7 | 43
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 | 24 |
Regulatory Liabilities | 91 | 113
Regulatory Assets Earning a Rate of Return at the Approved Rate | 67 |
RemainingAmountsOfRegulatoryLiabilitesForWhichNoInterstAccruesDuringRecoveryPeriodIsProvided | 219 |
Deferred Derivative Gain (Loss) [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets |  | 55
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 195 |
Regulatory Liabilities | 0 |
Earning a return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Liabilities | 1,404 |
Other Regulatory Assets Earning a Return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 70 |
Earning a return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 253 |
Deferred Derivative Gain (Loss) [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 0 | 55
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 1 |
Pension and Other Postretirement Plans Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 0 | 131
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 95 |
Loss on Reacquired Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 0 | 23
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 21 |
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 | 133 | 90
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 94 | 81
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 24 |
February2021IceStormAndDamageDeferral |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 74 | 67
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
PowerCostAdjustmentMechanismDeferral |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 28 | 29
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
2020LaborDayWildfireDeferral |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 31 | 45
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
COVID-19Deferral |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 22 | 36
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 | 28 | $ 0
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | $ 0 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 55 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=123406419&loc=d3e44360-110383 + Details
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