DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE COMMODITY VOLUMES (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2022 MMBTU MWh	Dec. 31, 2021 MMBTU MWh
Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount | MMBTU	162
Natural gas | Long
Derivative [Line Items]
Derivative, nonmonetary notional amount | MMBTU		184
Electricity | Long
Derivative [Line Items]
Derivative, nonmonetary notional amount | MWh	1	1
Congestion revenue rights | Long
Derivative [Line Items]
Derivative, nonmonetary notional amount | MWh	43	45
SDG&E | Natural gas | Long
Derivative [Line Items]
Derivative, nonmonetary notional amount | MMBTU	5	7
SDG&E | Electricity | Long
Derivative [Line Items]
Derivative, nonmonetary notional amount | MWh	1	1
SDG&E | Congestion revenue rights | Long
Derivative [Line Items]
Derivative, nonmonetary notional amount | MWh	43	45
SoCalGas | Natural gas | Long
Derivative [Line Items]
Derivative, nonmonetary notional amount | MMBTU	143	201