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
	Feb. 21, 2023 USD ($)	Oct. 25, 2022 USD ($)	Mar. 18, 2022 USD ($)	Jan. 05, 2022 USD ($)	Oct. 29, 2021 USD ($) a	Nov. 04, 2019 numberOfPeople	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Apr. 26, 2023 numberOfClaimHolder complaint numberOfPlaintiff notice plaintiff	Feb. 03, 2023 notice	Jan. 17, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 06, 2022 a injury numberOfFatality structure	Aug. 31, 2022 USD ($)	Jun. 09, 2022 notice	Apr. 28, 2022 USD ($)	Nov. 18, 2021 notice	Sep. 24, 2021 felony misdemeanor	Jul. 13, 2021 a structure injury	Sep. 27, 2020 a injury structure fatality	Oct. 23, 2019 a structure numberOfFatality injury
Loss Contingencies [Line Items]
Amount expected to pay							$ 117.0	$ 118.0
Settlement amount proposed											$ 24.0
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
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							371.0
Number of demurrer filed (count) | notice																	10
Number of criminal complaints (count) | notice										11							31
Number of criminal complaints dismissed (count) | notice															20
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
Initial self-insured retention per occurrence							60.0
Legal fees							31.0
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
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							529.0
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 liability							1,175.0
Loss contingency, costs incurred					$ 650.0
Probable of recovery							1,218.0
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							49.0
Liability insurance coverage							784.0
Number of residential structures destroyed (structure) | structure													44
Number of detached structures destroyed (structure) | structure													40
Loss contingency liability												$ 100.0
Probable of recovery							109.0
Percentage of fire contained													100.00%
Subsequent Event | 2019 Kincade fire
Loss Contingencies [Line Items]
Number of complaints (complaint) | complaint									124
Number of plaintiffs represented by complaints | plaintiff									2,745
Subsequent Event | 2020 Zogg fire
Loss Contingencies [Line Items]
Number of complaints (complaint) | complaint									29
Number of plaintiffs represented by complaints | numberOfPlaintiff									523
Subsequent Event | 2021 Dixie fire
Loss Contingencies [Line Items]
Number of complaints (complaint) | numberOfClaimHolder									95
Number of plaintiffs represented by complaints | numberOfClaimHolder									2,361
Subsequent Event | 2022 Mosquito fire
Loss Contingencies [Line Items]
Number of complaints (complaint) | complaint									6
Number of plaintiffs represented by complaints | notice									236
FERC TO rates | 2021 Dixie fire
Loss Contingencies [Line Items]
Probable of recovery							116.0
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							398.0
Increase in regulatory asset							10.0
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							$ 117.0	$ 118.0