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WILDFIRE-RELATED CONTINGENCIES (Pre-petition Wildfire-Related Claims) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 22, 2019
Loss Contingencies [Line Items]      
Total wildfire-related claims $ 25,500.0    
Pacific Gas & Electric Co      
Loss Contingencies [Line Items]      
Total wildfire-related claims 25,500.0 $ 14,200.0  
Subrogation insurance claims 11,000.0    
Subrogation claims, professional fees 47.5   $ 55.0
Legal and other costs 152.0 $ 245.0  
Pacific Gas & Electric Co | Public Entity Wildfire Claims      
Loss Contingencies [Line Items]      
Total wildfire-related claims 1,000.0    
Pacific Gas & Electric Co | TCC Wildfire-related Claims      
Loss Contingencies [Line Items]      
Total wildfire-related claims $ 13,500.0