INCOME TAXES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items]
Income tax benefit related to outside differences on plans to sell businesses			$ (89)
Income tax expense related to increase in outside basis differences	$ 51	$ (7)
Foreign undistributed earnings		1,300
Undistributed earnings of foreign subsidiaries considered to be indefinitely reinvested		58
Foreign earnings repatriated		4,700	254	$ 338
San Diego Gas and Electric Company [Member]
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items]
Income tax expense recognized in current period, related to remeasurement of deferred income tax assets and liabilities			31
Southern California Gas Company [Member]
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items]
Income tax expense recognized in current period, related to remeasurement of deferred income tax assets and liabilities			$ 38
Non-U.S. [Member]
Schedule of Effect of Changes in Legislation of Income Tax (Expense) [Line Items]
Undistributed earnings of foreign subsidiaries considered to be indefinitely reinvested		$ 1,100