SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Cost	$ 668		$ 669
Gross unrealized gains	216		227
Gross unrealized losses	(19)		(21)
Estimated fair value	865		875
Proceeds from sales	274	$ 181
Gross realized gains	10	14
Gross realized losses	2	$ 2
Short-term investments, primarily cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	18		10
Gross unrealized gains	0		0
Gross unrealized losses	0		0
Estimated fair value	18		10
Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	72		78
Gross unrealized gains	211		223
Gross unrealized losses	(3)		(3)
Estimated fair value	280		298
Total debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	596		596
Gross unrealized gains	5		4
Gross unrealized losses	(16)		(18)
Estimated fair value	585		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	61		67
Gross unrealized gains	1		1
Gross unrealized losses	(1)		(1)
Estimated fair value	61		67
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Cost	296		295
Gross unrealized gains	1		1
Gross unrealized losses	(9)		(9)
Estimated fair value	288		287
Other securities
Debt Securities, Available-for-sale [Line Items]
Cost	239		234
Gross unrealized gains	3		2
Gross unrealized losses	(6)		(8)
Estimated fair value	236		228
Receivables (payables), net
Debt Securities, Available-for-sale [Line Items]
Cost	(18)		(15)
Gross unrealized gains	0		0
Gross unrealized losses	0		0
Estimated fair value	$ (18)		$ (15)