WILDFIRE-RELATED CONTINGENCIES (2019 Kincade Fire, 2020 Zogg Fire, 2021 Dixie Fire and 2022 Mosquito Fire) (Details) numberOfPeople in Millions, $ in Millions					3 Months Ended
	Oct. 18, 2023 USD ($)	Jan. 05, 2022 USD ($)	Jul. 13, 2021 USD ($) a injury structure	Nov. 04, 2019 numberOfPeople	Mar. 31, 2024 USD ($)	Apr. 17, 2024 complaint plaintiff numberOfClaimHolder notice	Dec. 31, 2023 USD ($)	Oct. 09, 2023 USD ($)	Sep. 06, 2022 a structure numberOfFatality injury	Aug. 31, 2022 USD ($)	Sep. 27, 2020 a fatality injury structure	Oct. 23, 2019 a numberOfFatality structure injury
2019 Kincade Fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a												77,758
Number of fatalities (fatality) | numberOfFatality												0
Number of injuries | injury												4
Number of structures destroyed (structure) | structure												374
Number of structures damaged (structure) | structure												60
Number of people part of mandatory evacuation order | numberOfPeople				0.2
Fire fighting costs recovery requested		$ 90.0
Loss contingency liability							$ 1,125.0
Insurance receivable							$ 430.0
2020 Zogg fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a											56,338
Number of fatalities (fatality) | fatality											4
Number of injuries | injury											1
Number of structures destroyed (structure) | structure											204
Number of structures damaged (structure) | structure											27
Insurance receivable					$ 374.0
Potential loss contingency					400.0
Liability insurance coverage					611.0
Initial self-insured retention per occurrence					60.0
Legal fees					34.0
Insurance Coverage for Wildfire Events
Loss Contingencies [Line Items]
Liability insurance coverage										$ 600.0
Initial self-insured retention per occurrence					60.0
2021 Dixie fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a			963,309
Number of structures destroyed (structure) | structure			1,311
Number of structures damaged (structure) | structure			94
Insurance receivable					526.0
Liability insurance coverage					900.0
Number of residential structures destroyed (structure) | structure			763
Number of multi-family residential structures destroyed (structure) | structure			12
Number of commercial residential structures destroyed (structure) | structure			8
Number of commercial non-residential structures destroyed (structure) | structure			148
Number of detached structures destroyed (structure) | structure			466
Number of first responder injuries (injury) | injury			4
Loss contingency approximate cost	$ 40.0
Loss contingency approximate cost, period	5 years
Estimated losses					1,600.0
Loss contingency, costs incurred			$ 650.0
Probable of recovery					1,702.0
2021 Dixie fire | California General Fund
Loss Contingencies [Line Items]
Settlement amount proposed								$ 2.5
2021 Dixie fire | 2021 Dixie Fire, Tribes Impacted
Loss Contingencies [Line Items]
Settlement amount proposed								$ 2.5
2021 Dixie fire | Other Current Liabilities
Loss Contingencies [Line Items]
Potential loss contingency					5.0
2022 Mosquito fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a									76,788
Number of fatalities (fatality) | numberOfFatality									0
Number of injuries | injury									0
Number of structures destroyed (structure) | structure									78
Number of structures damaged (structure) | structure									13
Loss contingency liability					100.0
Insurance receivable					68.0
Liability insurance coverage					733.0
Number of residential structures destroyed (structure) | structure									44
Number of detached structures destroyed (structure) | structure									40
Probable of recovery					128.0
Percentage of fire contained									100.00%
Subsequent Event | 2019 Kincade Fire
Loss Contingencies [Line Items]
Number of complaints (complaint) | complaint						132
Number of plaintiffs represented by complaints | plaintiff						2,913
Subsequent Event | 2021 Dixie fire
Loss Contingencies [Line Items]
Number of complaints (complaint) | numberOfClaimHolder						167
Number of plaintiffs represented by complaints | numberOfClaimHolder						8,478
Subsequent Event | 2022 Mosquito fire
Loss Contingencies [Line Items]
Number of complaints (complaint) | complaint						6
Number of plaintiffs represented by complaints | notice						233
FERC TO rates | 2021 Dixie fire
Loss Contingencies [Line Items]
Probable of recovery					92.0
FERC TO rates | 2022 Mosquito fire
Loss Contingencies [Line Items]
Probable of recovery					8.0
WEMA | 2021 Dixie fire
Loss Contingencies [Line Items]
Probable of recovery					484.0
WEMA | 2022 Mosquito fire
Loss Contingencies [Line Items]
Probable of recovery					$ 52.0
National Park | 2021 Dixie fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a			70,000
National Forrest | 2021 Dixie fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a			685,000