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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Assets) (Details) - USD ($) $ in Millions | 7 Months Ended | 9 Months Ended | 21 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | $ 9,479.0 | $ 9,479.0 | $ 9,479.0 | $ 8,978.0
Retained generation asset costs | 1,200.0 | 1,200.0 | 1,200.0 |
Regulatory assets | 724.0 | 724.0 | 724.0 | 410.0
Pension benefits |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 2,136.0 | 2,136.0 | 2,136.0 | 2,245.0
Environmental compliance costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 1,082.0 | 1,082.0 | 1,082.0 | 1,112.0
Utility retained generation |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 145.0 | 145.0 | 145.0 | 181.0
Price risk management |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 223.0 | 223.0 | 223.0 | 204.0
Unamortized loss, net of gain, on reacquired debt |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 40.0 | 40.0 | 40.0 | 49.0
Catastrophic event memorandum account |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 989.0 | 989.0 | 989.0 | 842.0
Catastrophic event memorandum account | COVID-19 |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 64.0 | 64.0 | 64.0 |
Wildfire expense memorandum account |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 455.0 | 455.0 | 455.0 | 400.0
Fire hazard prevention memorandum account |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 75.0 | 75.0 | 75.0 | 137.0
Fire risk mitigation memorandum account |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 44.0 | 44.0 | 44.0 | 66.0
Wildfire mitigation plan memorandum account |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 342.0 | 342.0 | 342.0 | 390.0
Deferred income taxes |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 1,515.0 | 1,515.0 | 1,515.0 | 908.0
Insurance premium costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 232.0 | 232.0 | 232.0 | 294.0
Wildfire mitigation balancing account |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 215.0 | 215.0 | $ 215.0 | 156.0
Wildfire mitigation balancing account | Minimum |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Cost percentage threshold requiring approval |  |  | 115.00% |
General rate case memorandum accounts |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | $ 117.0 | 117.0 | $ 117.0 | 376.0
Recovery period | 22 months |  |  |
Vegetation management balancing account |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | $ 690.0 | $ 690.0 | 690.0 | 592.0
Vegetation management balancing account | Minimum |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Cost percentage threshold requiring approval |  | 120.00% |  |
COVID-19 pandemic protection memorandum account |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 47.0 | $ 47.0 | 47.0 | 84.0
Regulatory assets | 30.0 | 30.0 | 30.0 |
COVID-19 pandemic protection memorandum account | Residential uncollectibles balancing accounts |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory balancing account | 250.0 | 250.0 | 250.0 |
COVID-19 pandemic protection memorandum account, undercollection bad debt |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 297.0 | 297.0 | 297.0 |
COVID-19 pandemic protection memorandum account, program and accounts receivable financing costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 17.0 | 17.0 | 17.0 |
Other |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 1,132.0 | 1,132.0 | 1,132.0 | $ 942.0
Wildfire Expense Memorandum Account - Incremental Claims |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | 339.0 | 339.0 | 339.0 |
Wildfire Expense Memorandum Account - Premium Costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Total long-term regulatory assets | $ 116.0 | $ 116.0 | $ 116.0 |

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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 -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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