WILDFIRE-RELATED CONTINGENCIES (Third-Party Claims) (Details) household in Thousands, $ in Millions			1 Months Ended		2 Months Ended
	Jan. 28, 2019 contractor household plaintiff complaint	Apr. 13, 2017 USD ($)	Nov. 30, 2018 USD ($)	May 31, 2017 USD ($)	Sep. 30, 2018 district entity	May 01, 2018 plaintiff	May 23, 2016 contractor
Loss Contingencies [Line Items]
Number of plaintiffs in which agreements were made with | plaintiff						2
2015 Butte fire | Pacific Gas & Electric Co
Loss Contingencies [Line Items]
Number of vegetation management contractors (contractor) | contractor							2
Number of complaints filed (complaint) | complaint	95
Number of plaintiffs (plaintiff) | plaintiff	3,900
Number of households represented in court (household) | household	2
Number of vegetation management contractors dismissed from complaints (contractor) | contractor	2
Number of plaintiffs, smaller public entities (plaintiff) | entity					4
Number of plaintiffs, fire districts (plaintiff) | district					3
Fire fighting costs recovery requested		$ 87.0
Value of claims brought against the company				$ 190.0
Value of claims brought against the company, proof of claim				$ 107.0
2015 Butte fire | Pacific Gas & Electric Co | County of Calaveras
Loss Contingencies [Line Items]
Settlement reached			$ 25.0