WILDFIRE-RELATED CONTINGENCIES (District Attorneys Offices Investigations) (Details) $ in Millions			3 Months Ended		9 Months Ended
	Jul. 21, 2020 USD ($)	Mar. 17, 2020 USD ($) count	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Loss Contingencies [Line Items]
Settlement expense			$ 120.0	$ 0.0	$ 293.0	$ 0.0
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Settlement expense			$ 120.0	$ 0.0	$ 293.0	$ 0.0
Pacific Gas & Electric Co | Complaints Brought By Butte County District Attorney | Loss from Wildfires
Loss Contingencies [Line Items]
Number of Guilty Involuntary Manslaughter Pleas | count		84
Settlement expense	$ 3.5	$ 3.5
Reimbursement of investigation fees	$ 0.5	0.5
Committed funds for impacted residence		$ 15.0
Committed funds for impacted residence, minimum term		5 years