SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Cost	$ 674		$ 674		$ 669
Gross unrealized gains	234		234		227
Gross unrealized losses	(11)		(11)		(21)
Estimated fair value	897		897		875
Proceeds from sales			831	$ 704
SDG&E
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales	210	$ 259	709	639
Gross realized gains	12	17	43	41
Gross realized losses	1	$ 2	6	$ 7
Short-term investments, primarily cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	21		21		10
Gross unrealized gains	0		0		0
Gross unrealized losses	0		0		0
Estimated fair value	21		21		10
Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	69		69		78
Gross unrealized gains	225		225		223
Gross unrealized losses	(2)		(2)		(3)
Estimated fair value	292		292		298
Total debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	604		604		596
Gross unrealized gains	9		9		4
Gross unrealized losses	(9)		(9)		(18)
Estimated fair value	604		604		582
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Cost	53		53		67
Gross unrealized gains	1		1		1
Gross unrealized losses	0		0		(1)
Estimated fair value	54		54		67
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Cost	299		299		295
Gross unrealized gains	3		3		1
Gross unrealized losses	(6)		(6)		(9)
Estimated fair value	296		296		287
Other securities
Debt Securities, Available-for-sale [Line Items]
Cost	252		252		234
Gross unrealized gains	5		5		2
Gross unrealized losses	(3)		(3)		(8)
Estimated fair value	254		254		228
Receivables (payables), net
Debt Securities, Available-for-sale [Line Items]
Cost	(20)		(20)		(15)
Gross unrealized gains	0		0		0
Gross unrealized losses	0		0		0
Estimated fair value	$ (20)		$ (20)		$ (15)