WILDFIRE-RELATED CONTINGENCIES (2018 Camp Fire and 2017 Northern California Wildfires Accounting Charge) (Details) $ in Millions		3 Months Ended		12 Months Ended
	Dec. 11, 2018	Dec. 31, 2018 USD ($) wildfire	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) wildfire	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
2018 Camp fire
Loss Contingencies [Line Items]
Accrued losses				$ 10,500
2017 Northern California wildfires
Loss Contingencies [Line Items]
Number of fires with probable losses (wildfire) | wildfire		17		17
Loss from claims related to wildfire		$ 1,000	$ 2,500	$ 3,500
Pacific Gas & Electric Co | 2018 Camp fire
Loss Contingencies [Line Items]
Electric Incident Report, term	20 days
Loss from claims related to wildfire				10,500	$ 0	$ 0
Pacific Gas & Electric Co | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Loss from claims related to wildfire				$ 3,500	$ 0	$ 0