WILDFIRE-RELATED CONTINGENCIES (Wildfire Fund) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Nov. 01, 2019	Aug. 02, 2019	Jul. 12, 2019
Loss Contingencies [Line Items]
Wildfire-related claims	$ 25,500.0
Disallowance cap, transmission and distribution equity rate base				$ 2,400.0
Expected capitalization, proceeds of bond	10,500.0
Expected capitalization, initial contribution	7,500.0
Expected capitalization, annual contribution	$ 300.0
Expected wildfire fund allocation metric, percentage				64.20%
Expected wildfire fund allocation metric, initial contribution				$ 4,800.0
Expected wildfire fund allocation metric, annual contributions				193.0
Expected wildfire fund allocation metric, initial capital expenditure				$ 5,000.0
2018 Camp Fire and 2017 Northern California Wildfires
Loss Contingencies [Line Items]
Wildfire-related claims			$ 105.0
Claimant payments		$ 74.0