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	9 Months Ended
	Feb. 21, 2023 USD ($)	Oct. 25, 2022 USD ($)	Mar. 18, 2022 USD ($)	Jan. 05, 2022 USD ($)	Oct. 29, 2021 USD ($) a	Nov. 04, 2019 numberOfPeople	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Oct. 18, 2023 USD ($) complaint plaintiff numberOfClaimHolder notice numberOfPlaintiff	Oct. 09, 2023 USD ($)	May 31, 2023 USD ($)	Feb. 24, 2023 notice	Jan. 17, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 06, 2022 a structure numberOfFatality injury	Aug. 31, 2022 USD ($)	Jun. 09, 2022 notice	Apr. 30, 2022 USD ($)	Sep. 24, 2021 felony misdemeanor	Jul. 13, 2021 a structure injury	Sep. 27, 2020 a fatality injury structure	Oct. 23, 2019 a numberOfFatality injury structure
Loss Contingencies [Line Items]
Amount expected to pay								$ 453.0	$ 352.0
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								1,025.0
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							373.0	373.0
Number of criminal complaints (count) | notice													11					31
Number of criminal complaints dismissed (count) | notice													10					20
Stipulation costs payable												$ 50.0
Penalty recommended		$ 155.0
Costs unable to recover	$ 140.0
Litigation liability, payment accrual															$ 10.0
Fire suppression and other costs			$ 34.5
Liability insurance coverage							611.0	611.0
Initial self-insured retention per occurrence							60.0	60.0
Legal fees								33.0
2020 Zogg fire | Other Current Liabilities
Loss Contingencies [Line Items]
Stipulation costs payable							46.0	46.0
Zogg Complaint, 2020
Loss Contingencies [Line Items]
Number of felonies (felony) | felony																				11
Number of misdemeanors (misdemeanor) | misdemeanor																				20
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
Insurance receivable							527.0	527.0
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 liability															$ 1,175.0
Estimated losses							1,600.0	1,600.0
Loss contingency, costs incurred					$ 650.0
Probable of recovery								1,669.0
2021 Dixie fire | California General Fund
Loss Contingencies [Line Items]
Settlement amount proposed														$ 24.0
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
Insurance receivable							58.0	58.0
Liability insurance coverage							733.0	733.0
Number of residential structures destroyed (structure) | structure																44
Number of detached structures destroyed (structure) | structure																40
Loss contingency liability							$ 100.0	100.0
Probable of recovery								118.0
Percentage of fire contained																100.00%
Subsequent Event | 2019 Kincade fire
Loss Contingencies [Line Items]
Number of complaints (complaint) | complaint										125
Number of plaintiffs represented by complaints | plaintiff										2,870
Subsequent Event | 2020 Zogg fire
Loss Contingencies [Line Items]
Number of complaints (complaint) | complaint										32
Number of plaintiffs represented by complaints | numberOfPlaintiff										541
Subsequent Event | 2021 Dixie fire
Loss Contingencies [Line Items]
Number of complaints (complaint) | numberOfClaimHolder										161
Number of plaintiffs represented by complaints | numberOfClaimHolder										8,222
Loss contingency approximate cost										$ 40.0
Subsequent Event | 2021 Dixie fire | California General Fund
Loss Contingencies [Line Items]
Settlement amount proposed											$ 2.5
Subsequent Event | 2021 Dixie fire | 2021 Dixie Fire, Tribes Impacted
Loss Contingencies [Line Items]
Settlement amount proposed											$ 2.5
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								88.0
FERC TO rates | 2022 Mosquito fire
Loss Contingencies [Line Items]
Probable of recovery								9.0
WEMA | 2021 Dixie fire
Loss Contingencies [Line Items]
Probable of recovery								454.0
WEMA | 2022 Mosquito fire
Loss Contingencies [Line Items]
Probable of recovery								51.0
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
California General Fund | 2020 Zogg fire
Loss Contingencies [Line Items]
Amount expected to pay	$ 10.0
Pacific Gas & Electric Co (Utility)
Loss Contingencies [Line Items]
Amount expected to pay								$ 453.0	$ 352.0