WILDFIRE-RELATED CONTINGENCIES (Clean-up and Repair Costs) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Loss Contingencies [Line Items]
Capital expenditures	$ 273,000,000	$ 836,000,000
Total long-term regulatory assets	7,507,000,000		$ 6,066,000,000
Catastrophic event memorandum account
Loss Contingencies [Line Items]
Total long-term regulatory assets	646,000,000		656,000,000
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Capital expenditures	273,000,000	$ 836,000,000
Total long-term regulatory assets	7,507,000,000		$ 6,066,000,000
Pacific Gas & Electric Co | 2018 Camp Fire
Loss Contingencies [Line Items]
Service restoration and repair costs	826,000,000
Capital expenditures	358,000,000
Pacific Gas & Electric Co | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Service restoration and repair costs	349,000,000
Capital expenditures	193,000,000
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 | 2018 Camp Fire
Loss Contingencies [Line Items]
Total long-term regulatory assets	0
Pacific Gas & Electric Co | Catastrophic event memorandum account | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Total long-term regulatory assets	49,000,000
Pacific Gas & Electric Co | Catastrophic event memorandum account | 2019 Kincade Fire
Loss Contingencies [Line Items]
Total long-term regulatory assets	$ 0