GENERAL INFORMATION AND OTHER FINANCIAL DATA - AFFILIATES REVENUE AND COST OF SALES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Related Party Transaction [Line Items]
Revenues	$ 3,655	$ 3,802
Interest expense	382	433
Related Party
Related Party Transaction [Line Items]
Revenues	8	9
Interest expense	6	4
SDG&E
Related Party Transaction [Line Items]
Revenues	1,547	1,420
Interest expense	147	135
Operating revenues	1,547	1,420
SDG&E | Related Party
Related Party Transaction [Line Items]
Operating revenues	6	6
Cost of sales	28	38
SoCalGas
Related Party Transaction [Line Items]
Revenues	1,728	2,020
Interest expense	97	90
Operating revenues	1,728	2,020
SoCalGas | Related Party
Related Party Transaction [Line Items]
Operating revenues	46	41
Cost of sales	$ 0	$ (1)