WILDFIRE-RELATED CONTINGENCIES (Wildfire Fund) (Details) - USD ($) $ in Millions	Jan. 14, 2021	Aug. 23, 2019	Dec. 31, 2020	Jul. 01, 2020	Jul. 12, 2019
Loss Contingencies [Line Items]
Disallowance cap, transmission and distribution equity rate base					$ 2,700
Initial safety certification, period		12 months
Initial safety certification, documentation provided, period		90 days
Expected capitalization, proceeds of bond			$ 10,500
Expected capitalization, initial contribution			7,500
Expected capitalization, annual contribution			300
Expected wildfire fund allocation metric, percentage					64.20%
Expected wildfire fund allocation metric, initial contribution					$ 4,800
Expected wildfire fund allocation metric, annual contributions					193
Allocation					$ 3,210
Initial contribution payment				$ 4,800
Annual contribution, first payment				$ 193
Annual contribution, second payment			$ 193
Subsequent Event
Loss Contingencies [Line Items]
Initial safety certification, valid period	12 months