WILDFIRE-RELATED CONTINGENCIES (Clean-up and Repair Costs) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Loss Contingencies [Line Items]
Capital expenditures	$ 836	$ 317
Total long-term regulatory assets	5,349		$ 4,964
Catastrophic event memorandum account
Loss Contingencies [Line Items]
Total long-term regulatory assets	918		790
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Capital expenditures	836	$ 317
Total long-term regulatory assets	5,349		$ 4,964
Pacific Gas & Electric Co | 2018 Camp fire
Loss Contingencies [Line Items]
Service restoration and repair costs	655
Capital expenditures	236
Pacific Gas & Electric Co | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Service restoration and repair costs	334
Capital expenditures	161
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	$ 88