DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE COMMODITY VOLUMES (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2024 MMBTU MWh	Dec. 31, 2023 MMBTU MWh
Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount | MMBTU	303	361
Electricity
Derivative [Line Items]
Derivative, nonmonetary notional amount | MWh	0	1
Congestion revenue rights
Derivative [Line Items]
Derivative, nonmonetary notional amount | MWh	33	36
SDG&E | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount | MMBTU	18	17
SDG&E | Congestion revenue rights
Derivative [Line Items]
Derivative, nonmonetary notional amount | MWh	33	36
SoCalGas | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount | MMBTU	210	268