SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - WILDFIRE FUND (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2019	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2019	Sep. 30, 2019
Loss Contingencies [Line Items]
Noncurrent portion of the Wildfire Fund asset		$ 269.0	$ 303.0
SDG&E
Loss Contingencies [Line Items]
Initial liability cap		1,300.0
Initial shareholder contributions					$ 322.5
Additional annual contributions, aggregate value		129.0
Wildfire fund asset				$ 451.5
Annual contributions		$ 12.9
Amortization of wildfire fund asset		15 years
Current portion of Wildfire fund		$ 28.0	29.0
Noncurrent portion of the Wildfire Fund asset		269.0	303.0
Wildfire fund obligations in current liabilities		13.0	13.0
Noncurrent Wildfire Fund obligation		42.0	$ 53.0
Wildfire Fund
Loss Contingencies [Line Items]
Wildfire fund, threshold amount to seek payment	$ 1,000.0
Wildfire fund, threshold percentage of equity portion of electric transmission	20.00%
Liquidity fund, maximum borrowing capacity		10,500.0
Initial shareholder contributions		7,500.0
Additional annual contributions, aggregate value		$ 3,000.0
Period of annual contributions		10 years