WILDFIRE-RELATED CONTINGENCIES (Clean-up and Repair Costs) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Loss Contingencies [Line Items]
Capital expenditures	$ 404,000,000	$ 981,000,000
Total long-term regulatory assets	7,986,000,000		$ 6,066,000,000
Catastrophic event memorandum account
Loss Contingencies [Line Items]
Total long-term regulatory assets	771,000,000		656,000,000
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Capital expenditures	404,000,000	$ 981,000,000
Total long-term regulatory assets	7,986,000,000		$ 6,066,000,000
Pacific Gas & Electric Co | 2019 Kincade Fire
Loss Contingencies [Line Items]
Service restoration and repair costs	62,000,000
Capital expenditures	18,000,000
Pacific Gas & Electric Co | Catastrophic event memorandum account | 2019 Kincade Fire
Loss Contingencies [Line Items]
Total long-term regulatory assets	$ 0