GENERAL INFORMATION AND OTHER FINANCIAL DATA - AFFILIATES REVENUE AND COST OF SALES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Related Party Transaction [Line Items]
Revenue from related parties	$ 10	$ 7	$ 32	$ 22
Costs of sales to related parties	0	0	0	11
Interest income	2	11	16	38
Interest expense	4	4	12	11
San Diego Gas and Electric Company
Related Party Transaction [Line Items]
Revenue from related parties	4	3	12	7
Costs of sales to related parties	17	20	67	75
Southern California Gas Company
Related Party Transaction [Line Items]
Revenue from related parties	24	24	73	72
Costs of sales to related parties	$ (1)	$ (2)	$ (5)	$ 1