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WILDFIRE-RELATED CONTINGENCIES (Pre-petition Wildfire-Related Claims) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 06, 2019
Sep. 22, 2019
Loss Contingencies [Line Items]          
Wildfire-related claims $ 25,500.0        
Subrogation claims, professional fees         $ 55.0
Pacific Gas & Electric Co          
Loss Contingencies [Line Items]          
Wildfire-related claims 25,500.0   $ 25,500.0    
Subrogation insurance claims 11,000.0        
Subrogation claims, professional fees 47.5        
Legal fees 34.0 $ 47.0      
Pacific Gas & Electric Co | Public Entity Wildfire Claims          
Loss Contingencies [Line Items]          
Wildfire-related claims 1,000.0        
Pacific Gas & Electric Co | All Other Wildfire-related Claims          
Loss Contingencies [Line Items]          
Wildfire-related claims $ 13,500.0     $ 13,500.0