WILDFIRE-RELATED CONTINGENCIES (2019 Kincade Fire) (Details) $ in Millions		6 Months Ended
	Nov. 04, 2019 numberOfPeople	Jun. 30, 2020 USD ($)	Jul. 31, 2020 USD ($)	Jul. 27, 2020 numberOfComplaint plaintiff	Oct. 23, 2019 a numberOfStructure injury customer structure facility
2019 Kincade Fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a					77,758
Number of fatalities (fatality) | facility					0
Number of injuries | injury					4
Number of structures destroyed (structure) | 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
Potential loss contingency | $		$ 600.0
Loss contingency, claim eligibility requirement amount | $		1,000.0
2019 Kincade Fire | Subsequent event
Loss Contingencies [Line Items]
Number of group complaint | numberOfComplaint				3
Number of plaintiffs represented by group complaints | plaintiff				142
Insurance Coverage for Wildfire Events
Loss Contingencies [Line Items]
Liability insurance coverage | $		$ 430.0
Insurance Coverage for Wildfire Events | Subsequent event
Loss Contingencies [Line Items]
Liability insurance coverage | $			$ 757.5