GENERAL INFORMATION AND OTHER FINANCIAL DATA - AFFILIATES REVENUE AND COST OF SALES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Related Party Transaction [Line Items]
Revenues	$ 3,802	$ 3,640
Interest expense	433	305
Related Party
Related Party Transaction [Line Items]
Revenues	9	10
Interest expense	4	4
SDG&E
Related Party Transaction [Line Items]
Revenues	1,420	1,379
Interest expense	135	128
Operating revenues	1,420	1,379
SDG&E | Related Party
Related Party Transaction [Line Items]
Operating revenues	6	6
Cost of sales	38	40
SoCalGas
Related Party Transaction [Line Items]
Revenues	2,020	1,805
Interest expense	90	77
Operating revenues	2,020	1,805
SoCalGas | Related Party
Related Party Transaction [Line Items]
Operating revenues	41	44
Cost of sales	$ (1)	$ (3)