DERIVATIVE FINANCIAL INSTRUMENTS - COMMODITY VOLUMES (Details)	12 Months Ended
	Dec. 31, 2021 MWh MMBTU	Dec. 31, 2020 MWh MMBTU	Dec. 31, 2019 MMBTU MWh
Natural gas
Derivatives, Fair Value [Line Items]
Notional amount, energy measure | MMBTU	184	189	231
Electricity
Derivatives, Fair Value [Line Items]
Notional amount, energy measure	1	1	2
Congestion revenue rights
Derivatives, Fair Value [Line Items]
Notional amount, energy measure	45	43	48
SDG&E | Natural gas
Derivatives, Fair Value [Line Items]
Notional amount, energy measure | MMBTU	7	16	37
SDG&E | Electricity
Derivatives, Fair Value [Line Items]
Notional amount, energy measure	1	1	2
SDG&E | Congestion revenue rights
Derivatives, Fair Value [Line Items]
Notional amount, energy measure	45	43	48
SoCalGas | Natural gas
Derivatives, Fair Value [Line Items]
Notional amount, energy measure | MMBTU	201	185	201