GENERAL INFORMATION AND OTHER FINANCIAL DATA - AFFILIATES REVENUE AND COST OF SALES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Related Party Transaction [Line Items]
Revenues	$ 3,151	$ 2,776	$ 9,953	$ 9,427
Interest expense	403	328	1,195	944
Related Party
Related Party Transaction [Line Items]
Revenues	9	11	26	31
Interest expense	4	5	13	12
SDG&E
Related Party Transaction [Line Items]
Revenues	1,480	1,243	4,162	3,977
Interest expense	141	131	415	390
Operating revenues	1,480	1,243	4,162	3,977
SDG&E | Related Party
Related Party Transaction [Line Items]
Operating revenues	6	6	17	17
Cost of sales	35	36	103	111
SoCalGas
Related Party Transaction [Line Items]
Revenues	1,181	1,054	4,469	4,168
Interest expense	93	82	272	237
Operating revenues	1,181	1,054	4,469	4,168
SoCalGas | Related Party
Related Party Transaction [Line Items]
Operating revenues	47	43	128	124
Cost of sales	$ (2)	$ (2)	$ (3)	$ (5)