WILDFIRE-RELATED CONTINGENCIES (2019 Kincade Fire, 2020 Zogg Fire and 2021 Dixie Fire) (Details) numberOfPeople in Millions, $ in Millions				3 Months Ended		12 Months Ended
	Oct. 29, 2021 USD ($) a	Oct. 18, 2021 USD ($)	Nov. 04, 2019 numberOfPeople	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Feb. 03, 2022 complaint numberOfClaimHolder plaintiff numberOfPlaintiff	Jan. 28, 2022 count notice	Jan. 27, 2022 notice	Dec. 02, 2021 transmissionLine	Nov. 18, 2021 notice	Sep. 24, 2021 felony misdemeanor	Jul. 13, 2021 a fatality structure	May 11, 2021 count	Apr. 06, 2021 felony misdemeanor	Sep. 27, 2020 a injury fatality structure	Dec. 31, 2019 USD ($)	Oct. 23, 2019 a injury numberOfFatality structure
Loss Contingencies [Line Items]
Insurance receivable				$ 1,247.0		$ 1,247.0	$ 674.0											$ 2,238.0
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
Number of transmission lines | transmissionLine											70
Loss contingency liability				769.0		769.0	625.0											0.0
Fire fighting costs recovery requested		$ 90.0
Potential loss contingency, additional						175.0
Potential loss contingency						800.0
Insurance receivable				414.0		414.0	430.0											0.0
Insurance receivable				430.0		430.0
2019 Kincade fire | Subsequent Event
Loss Contingencies [Line Items]
Number of felonies (felony) | notice									5	2
Number of demurrer filed (count) | count									22
Number of criminal complaints (count) | count									30
Number of misdemeanors dropped (misdemeanor) | notice									6
Number of complaints (complaint) | complaint								100
Number of plaintiffs represented by complaints | plaintiff								2,605
2019 Kincade fire | Pacific Gas & Electric Co (Utility)
Loss Contingencies [Line Items]
Number of demurrer filed (count) | count															25
Number of criminal complaints (count) | count															33
Loss contingency liability				40.0		40.0
May not seek recovery to remove permanently abandoned transmission lines						85.0
2019 Kincade fire | Pacific Gas & Electric Co (Utility) | Sonoma Contry District Attorney
Loss Contingencies [Line Items]
Number of felonies (felony) | felony																5
Number of misdemeanors (misdemeanor) | misdemeanor																28
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
Number of demurrer filed (count) | notice												10
Number of criminal complaints (count) | notice												31
Loss contingency liability				211.0		211.0	275.0											0.0
Potential loss contingency, additional					$ 100.0
Potential loss contingency						375.0	275.0
Insurance receivable				270.0		270.0	219.0											0.0
Liability insurance coverage				611.0		611.0
Initial self-insured retention per occurrence				60.0		60.0
Legal fees						22.0
Insurance receivable				337.0		337.0
2020 Zogg fire | Subsequent Event
Loss Contingencies [Line Items]
Number of complaints (complaint) | complaint								21
Number of plaintiffs represented by complaints | numberOfPlaintiff								382
2020 Zogg fire | Maximum
Loss Contingencies [Line Items]
Liability insurance coverage							867.5
Zogg Complaint, 2020
Loss Contingencies [Line Items]
Number of felonies (felony) | felony													11
Number of misdemeanors (misdemeanor) | misdemeanor													20
2021 Dixie fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a														963,309
Number of fatalities (fatality) | fatality														1
Number of structures destroyed (structure) | structure														1,329
Number of structures damaged (structure) | structure														95
May not seek recovery to remove permanently abandoned transmission lines	$ 630.0
Potential loss contingency				1,150.0
Insurance receivable				563.0		563.0	$ 0.0											$ 0.0
Number of residential structures destroyed (structure) | structure														717
Number of commercial structures destroyed (structure) | structure														143
Number of other structures destroyed (structure) | structure														443
Insurance receivable				563.0		563.0
Probable of recovery						1,161.0
2021 Dixie fire | Subsequent Event
Loss Contingencies [Line Items]
Number of complaints (complaint) | numberOfClaimHolder								20
Number of plaintiffs represented by complaints | numberOfClaimHolder								1,005
2021 Dixie fire | FERC TO rates
Loss Contingencies [Line Items]
Probable of recovery						101.0
2021 Dixie fire | WEMA
Loss Contingencies [Line Items]
Probable of recovery						347.0
2021 Dixie fire | National Park
Loss Contingencies [Line Items]
Number of acres burned (acre) | a	70,000
2021 Dixie fire | National Forrest
Loss Contingencies [Line Items]
Number of acres burned (acre) | a	685,000
Zogg Fire, 2020 and Dixie Fire, 2021
Loss Contingencies [Line Items]
Liability insurance coverage				$ 900.0		$ 900.0