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		12 Months Ended
	Oct. 18, 2023 USD ($)	Jan. 05, 2022 USD ($)	Oct. 29, 2021 USD ($) a	Nov. 04, 2019 numberOfPeople	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Feb. 14, 2024 numberOfClaimHolder complaint plaintiff notice	Oct. 09, 2023 USD ($)	Jan. 17, 2023 USD ($)	Sep. 06, 2022 a structure injury numberOfFatality	Aug. 31, 2022 USD ($)	Apr. 30, 2022 USD ($)	Jul. 13, 2021 a structure injury	Sep. 27, 2020 a structure fatality injury	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
Potential loss contingency					$ 100.0			$ 1,025.0
Loss contingency liability					1,125.0		$ 1,125.0
Insurance receivable					430.0		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
Potential loss contingency								400.0
Insurance receivable					374.0		374.0
Liability insurance coverage					611.0		611.0
Initial self-insured retention per occurrence					60.0		60.0
Legal fees							34.0
Insurance Coverage for Wildfire Events
Loss Contingencies [Line Items]
Liability insurance coverage													$ 600.0	$ 340.0
Initial self-insured retention per occurrence					60.0		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
Potential loss contingency						$ 425.0
Loss contingency liability								$ 1,175.0
Insurance receivable					526.0		526.0
Liability insurance coverage					900.0		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		1,600.0
Loss contingency, costs incurred			$ 650.0
Probable of recovery							1,687.0
2021 Dixie fire | California General Fund
Loss Contingencies [Line Items]
Settlement amount proposed										$ 2.5	$ 24.0
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		100.0
Insurance receivable					63.0		63.0
Liability insurance coverage					$ 733.0		733.0
Number of residential structures destroyed (structure) | structure												44
Number of detached structures destroyed (structure) | structure												40
Probable of recovery							123.0
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									161
Number of plaintiffs represented by complaints | numberOfClaimHolder									8,387
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							91.0
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							470.0
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