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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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Regulatory Assets, Cost Percentage Threshold Requiring Approval

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The Utility's current regulatory balancing accounts represent the amounts expected to be received from or refunded to the Utility's customers through authorized rate adjustments within the next 12 months.

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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.

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