WILDFIRE-RELATED CONTINGENCIES (2017 Northern California Wildfires Background) (Details) - Pacific Gas & Electric Co - 2017 Northern California wildfires	Oct. 30, 2017 a wildfire facility structure
Loss Contingencies [Line Items]
Number of wildfires (wildfire)	21
Number of acres burned (acre) | a	245,000
Number of destroyed structures (structures) | structure	8,900
Number of fatalities (fatality) | facility	44
Number of wildfires caused by equipment (wildfire)	20