WILDFIRE-RELATED CONTINGENCIES (Summary of Estimated Liabilities) (Details) - Pacific Gas & Electric Co - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Total wildfire-related claims	$ 20,560	$ 14,226
2015 Butte fire
Loss Contingencies [Line Items]
Total wildfire-related claims	212	226
2017 Northern California wildfires
Loss Contingencies [Line Items]
Total wildfire-related claims	7,492	3,500
2018 Camp Fire
Loss Contingencies [Line Items]
Total wildfire-related claims	$ 12,856	$ 10,500