DERIVATIVE FINANCIAL INSTRUMENTS - CASH FLOW HEDGES NARRATIVE (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified	$ (22)
Cash flow hedge gain (loss) to be reclassified, NCI	$ 6
Term of interest rate cash flow hedge	13 years
Southern California Gas Company
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified	$ (1)
Equity Method Investee
Derivative [Line Items]
Term of interest rate cash flow hedge	18 years