WILDFIRE-RELATED CONTINGENCIES (Third-Party Claims, Investigations and Other Proceedings Related to the 2018 Camp Fire and 2017 Northern California Wildfires) (Details) $ in Millions		3 Months Ended
	Jan. 28, 2019 complaint plaintiff	Mar. 31, 2020 USD ($)	Apr. 21, 2020 USD ($)	Mar. 20, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Wildfire-related claims		$ 25,500.0
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Wildfire-related claims		25,500.0			$ 25,500.0
Pacific Gas & Electric Co | 2017 Northern California wildfires and the 2018 Camp Fire
Loss Contingencies [Line Items]
Amount of claims filed		503.0
Fire Victim Trust
Loss Contingencies [Line Items]
Wildfire-related claims				$ 13,500.0
Fire Victim Trust | Subsequent event
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
FEMA | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Amount of claims filed		1,200.0
FEMA | 2018 Camp Fire
Loss Contingencies [Line Items]
Amount of claims filed		2,600.0
Cal Fire | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Amount of claims filed		133.0
Cal Fire | 2018 Camp Fire
Loss Contingencies [Line Items]
Amount of claims filed		110.0
OES | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Amount of claims filed		347.0
OES | 2018 Camp Fire
Loss Contingencies [Line Items]
Amount of claims filed		2,300.0
California Department of Transportation | 2018 Camp Fire
Loss Contingencies [Line Items]
Amount of claims filed		$ 217.0
Federal Agencies | Fire Victim Trust | Subsequent event
Loss Contingencies [Line Items]
Tentative agreement			1,000.0
Department of Justice | Fire Victim Trust | Subsequent event
Loss Contingencies [Line Items]
Tentative agreement			117.0
Other State Agencies | Fire Victim Trust | Subsequent event
Loss Contingencies [Line Items]
Tentative agreement			$ 89.0
Pending Litigation | Complaints Against PG&E Corporation and the Utility in Sacramento County Superior Court | 2018 Camp Fire
Loss Contingencies [Line Items]
Number of lawsuits filed against company (lawsuit, complaint) | complaint	100
Number of plaintiffs in lawsuit (plaintiff) | plaintiff	4,200
Pending Litigation | Complaints Against PG&E Corporation and the Utility in Sacramento County Superior Court, Classified as Class Action | 2018 Camp Fire
Loss Contingencies [Line Items]
Number of lawsuits filed against company (lawsuit, complaint) | complaint	9
Pending Litigation | Complaints Against PG&E Corporation and the Utility in San Francisco Counties Superior Courts | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Number of lawsuits filed against company (lawsuit, complaint) | complaint	750
Number of plaintiffs in lawsuit (plaintiff) | plaintiff	3,800
Pending Litigation | Lawsuits Against PG&E Corporation and the Utility in the Sonoma, Napa and San Francisco Counties Superior Courts, Classified As Class Actions | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Number of lawsuits filed against company (lawsuit, complaint) | complaint	5
Pending Litigation | Subrogation Complaints Against PG&E Corporation and the Utility in San Francisco County Superior Courts | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Number of lawsuits filed against company (lawsuit, complaint) | complaint	52
Pending Litigation | Subrogation Complaints Against PG&E Corporation and the Utility in Sacramento County Superior Court | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Number of lawsuits filed against company (lawsuit, complaint) | complaint	39