WILDFIRE-RELATED CONTINGENCIES (2018 Camp Fire and 2017 Northern California Wildfires Background) (Details) $ in Millions	Apr. 21, 2020 USD ($)	Nov. 08, 2018 a building fatality	Oct. 30, 2017 a wildfire structure fatality
Fire Victim Trust
Loss Contingencies [Line Items]
Claim	$ 115.3
Claim payment, initial	70.0
Claim payment, remaining	45.3
Proceeds from common stock	60.0
Common stock in excess	6,750.0
Fire Victim Trust | Federal Agencies
Loss Contingencies [Line Items]
Tentative agreement	1,000.0
Fire Victim Trust | Department of Justice
Loss Contingencies [Line Items]
Agreement payment	117.0
Fire Victim Trust | Other State Agencies
Loss Contingencies [Line Items]
Tentative agreement	$ 89.0
Pacific Gas & Electric Co | 2018 Camp Fire
Loss Contingencies [Line Items]
Number of acres burned (acre) | a		153,336
Number of fatalities (fatality) | fatality		85
Number of other buildings destroyed (structures) | building		18,804
Pacific Gas & Electric Co | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Number of acres burned (acre) | a			245,000
Number of fatalities (fatality) | fatality			44
Number of wildfires (wildfire) | wildfire			21
Number of structures destroyed (structure) | structure			8,900