WILDFIRE-RELATED CONTINGENCIES (2018 Camp Fire and 2017 Northern California Wildfires Accounting Charge) (Details) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) wild_fire	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Wildfire-related claims, net of insurance recoveries			$ 11,435	$ 11,771	$ 0
Wildfire-related claims, net of insurance recoveries, additional charge			5,000
Wildfire-related claims, charges during period			11,400
Wildfire-related claims			25,500
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Wildfire-related claims, net of insurance recoveries			11,435	11,771	$ 0
Wildfire-related claims			$ 25,500	14,200
2018 Camp Fire and 2017 Northern California Wildfires
Loss Contingencies [Line Items]
Number of fires with probable losses (wildfire) | wild_fire			21
2017 Northern California wildfires
Loss Contingencies [Line Items]
Wildfire-related claims, net of insurance recoveries	$ 2,500	$ 3,900		$ 14,000
2017 Northern California Wildfires, Other Than Tubbs And 37 Fires
Loss Contingencies [Line Items]
Number of fires with probable losses (wildfire) | wild_fire			37
Natural Gas Explosion | Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Accrued losses						$ 1,600
Loss contingency liability						$ 558