WILDFIRE-RELATED CONTINGENCIES (2019 Kincade Fire and 2020 Zogg Fire) (Details) $ in Millions		3 Months Ended	6 Months Ended	9 Months Ended
	Nov. 04, 2019 numberOfPeople	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Oct. 28, 2020 numberOfComplaint numberOfPlaintiff plaintiff	Sep. 27, 2020 a fatality structure injury	Oct. 23, 2019 a structure numberOfFatality injury customer
Loss Contingencies [Line Items]
Cumulative reimbursements from insurance policies | $				$ 430
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)							374
Number of residences destroyed (residence)							174
Number of commercial structures destroyed (structure)							11
Number of other buildings destroyed (structures)							189
Number of structures damaged (structure)							60
Number of residential structures damaged (structure)							35
Number of commercial structures damaged (structure)							1
Number of other structures damaged (structure)							24
Number of people part of mandatory evacuation order | numberOfPeople	200,000
Number of customers without power | customer							27,837
Litigation liability | $			$ 600
Potential loss contingency | $		$ 25		625
Loss contingency, claim eligibility requirement amount | $		$ 1,000		1,000
Cumulative reimbursements from insurance policies | $				$ 430
2019 Kincade Fire | Subsequent event
Loss Contingencies [Line Items]
Number of complaint | numberOfComplaint					16
Number of plaintiffs represented by complaints | plaintiff					377
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)						204
Number of structures damaged (structure)						27
2020 Zogg Fire | Subsequent event
Loss Contingencies [Line Items]
Number of complaint | numberOfComplaint					1
Number of plaintiffs represented by complaints | numberOfPlaintiff					6