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Regulatory Assets and Liabilities Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Regulatory Assets [Line Items] |  |
Regulatory Assets | $ 557 | $ 592
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 322 |
Regulatory Liabilities | 1,466 | 1,392
Deferred Purchased Power Costs | 62 | 13
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 | 1,047 | 1,016
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 | 208 | 239
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 | 43 | 37
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 | 56 |
Regulatory Liabilities | 113 | 82
Regulatory Assets Earning a Rate of Return at the Approved Rate | 57 |
RemainingAmountsOfRegulatoryLiabilitesForWhichNoInterstAccruesDuringRecoveryPeriodIsProvided | 111 |
Deferred Derivative Gain (Loss) [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets |  | 18
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 55 |
Regulatory Liabilities | 0 |
Earning a return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Liabilities | 1,355 |
Other Regulatory Assets Earning a Return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 58 |
Earning a return [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 235 |
Deferred Derivative Gain (Loss) [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 0 | 124
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 55 |
Pension and Other Postretirement Plans Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 0 | 240
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | $ 131 |
Loss on Reacquired Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Current Asset, End Date for Recovery | 2049 |
Regulatory Assets | $ 0 | 25
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | $ 23 |
Environmental Restoration Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Current Asset, End Date for Recovery | 2059 |
Regulatory Assets | $ 0 |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 90 | 95
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 81 | 83
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 23 |
February2021IceStormAndDamageDeferral |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 67 | 0
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
PowerCostAdjustmentMechanismDeferral |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 29 | 0
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |
2020LaborDayWildfireDeferral |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets | 45 | 15
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 | 36 | $ 10
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 http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + 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 http://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 http://asc.fasb.org/extlink&oid=123406419&loc=d3e44360-110383 + Details
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