GENERAL INFORMATION AND OTHER FINANCIAL DATA - AFFILIATES REVENUE AND COST OF SALES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Revenues	$ 3,334	$ 3,617	$ 13,229	$ 10,984
Interest income	19	18	60	58
Interest expense	312	282	995	796
Related Party
Related Party Transaction [Line Items]
Revenues	10	10	34	32
Interest income	0	2	0	16
Interest expense	3	4	11	12
San Diego Gas and Electric Company
Related Party Transaction [Line Items]
Interest income	7	2	12	3
Interest expense	126	113	367	333
Operating revenues	1,442	1,569	4,357	4,413
San Diego Gas and Electric Company | Related Party
Related Party Transaction [Line Items]
Operating revenues	5	4	15	12
Cost of sales	25	17	82	67
Southern California Gas Company
Related Party Transaction [Line Items]
Interest income	2	3	7	4
Interest expense	70	50	210	135
Operating revenues	1,313	1,385	6,574	4,879
Southern California Gas Company | Related Party
Related Party Transaction [Line Items]
Operating revenues	29	24	91	73
Cost of sales	$ 2	$ (1)	$ 37	$ (5)