WILDFIRE-RELATED CONTINGENCIES (Summary of Estimated Losses Related to Wildfire-Related Claims) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Total wildfire-related claims, net of insurance recoveries			$ 11,771	$ 0	$ 125
2017 Northern California wildfires
Loss Contingencies [Line Items]
Third-Party Claims	$ 1,000	$ 2,500	3,500
Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Total wildfire-related claims, net of insurance recoveries			11,771	0	125
Pacific Gas & Electric Co | 2015 Butte fire
Loss Contingencies [Line Items]
Third-Party Claims			0	350	750
Insurance recoveries			(7)	(350)	(625)
Total wildfire-related claims, net of insurance recoveries			(7)	0	125
Pacific Gas & Electric Co | 2017 Northern California wildfires
Loss Contingencies [Line Items]
Third-Party Claims			3,500	0	0
Insurance recoveries			(842)	0	0
Total wildfire-related claims, net of insurance recoveries			2,658	0	0
Pacific Gas & Electric Co | 2018 Camp fire
Loss Contingencies [Line Items]
Third-Party Claims			10,500	0	0
Insurance recoveries			(1,380)	0	0
Total wildfire-related claims, net of insurance recoveries			$ 9,120	$ 0	$ 0