INCOME TAXES - CHANGES IN UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Interest and penalties expense	$ 1
Potential resolution of audit issues with various U.S. federal, state and local and non-U.S. taxing authorities
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Possible change in unrecognized tax benefits in next 12 months	8	$ 8	$ 8
Potential resolution of audit issues with various U.S. federal, state and local and non-U.S. taxing authorities | San Diego Gas and Electric Company [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Possible change in unrecognized tax benefits in next 12 months	6	6	6
Potential resolution of audit issues with various U.S. federal, state and local and non-U.S. taxing authorities | SoCalGas
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Possible change in unrecognized tax benefits in next 12 months	$ 2	$ 2	$ 2