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CONTINGENCIES AND COMMITMENTS (Tax Matters and Tax Cuts and Jobs Act of 2017) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]        
Unrecognized tax benefits, decrease resulting from Settlements with taxing authorities   $ 20    
Pacific Gas & Electric Co        
Disaggregation of Revenue [Line Items]        
Adjustment of provisional tax expense $ 13 13    
Reduction to regulatory liability   $ 80    
Pacific Gas & Electric Co | Forecast | Rate Case 2015, 2017, 2019        
Disaggregation of Revenue [Line Items]        
Reduction to revenue requirements       $ 325
Increase to rate base     $ 613 271
Pacific Gas & Electric Co | Forecast | Other Rate Cases, Including TO19        
Disaggregation of Revenue [Line Items]        
Reduction to revenue requirements       125
Increase to rate base     $ 200 $ 100