OTHER CONTINGENCIES AND COMMITMENTS (Wildfire Insurance) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Costs for insurance coverage	$ 360
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Costs for insurance coverage	50
Insurance Coverage for Wildfire Events
Loss Contingencies [Line Items]
Liability insurance coverage	1,400
Insurance Coverage for Wildfire Liabilities
Loss Contingencies [Line Items]
Liability insurance coverage	700
Catastrophic bond reinsurance instrument	10
Insurance Coverage for Property Damages
Loss Contingencies [Line Items]
Liability insurance coverage	700
Catastrophic bond reinsurance instrument	$ 200