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WILDFIRE-RELATED CONTINGENCIES (Summary of Estimated Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]    
Total wildfire-related claims $ 14,226 $ 561
Pacific Gas & Electric Co    
Loss Contingencies [Line Items]    
Total wildfire-related claims 14,226 561
Pacific Gas & Electric Co | 2015 Butte fire    
Loss Contingencies [Line Items]    
Total wildfire-related claims 226 561
Pacific Gas & Electric Co | 2017 Northern California wildfires    
Loss Contingencies [Line Items]    
Total wildfire-related claims 3,500 0
Pacific Gas & Electric Co | 2018 Camp fire    
Loss Contingencies [Line Items]    
Total wildfire-related claims $ 10,500 $ 0