WILDFIRE-RELATED CONTINGENCIES (Wildfire Fund) (Details) - USD ($) $ in Millions	Jun. 24, 2021	Jul. 12, 2019	Jun. 30, 2021	May 11, 2021	Mar. 23, 2021	Feb. 24, 2021	Apr. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Disallowance cap, transmission and distribution equity rate base		$ 2,900.0
Initial safety certification, period		12 months
Initial safety certification, documentation provided, period		90 days
Expected capitalization, proceeds of bond		$ 10,500.0	$ 10,500.0
Expected capitalization, initial contribution		7,500.0	7,500.0
Expected capitalization, annual contribution		300.0	$ 300.0
Allocation		$ 3,210.0
2017 Northern California wildfires
Loss Contingencies [Line Items]
Customer Harm Threshold, post-emergence transaction, securitized				$ 7,500.0	$ 7,500.0		$ 7,500.0
2017 Northern California wildfires | Fire Risk Mitigation Capital Expenditures
Loss Contingencies [Line Items]
Customer Harm Threshold, post-emergence transaction, securitized	$ 1,190.0					$ 1,190.0
Recovery Bonds | 2017 Northern California wildfires | Fire Risk Mitigation Capital Expenditures
Loss Contingencies [Line Items]
Proceeds from issuance of debt	1,200.0
Debt issuance costs	$ 13.3