SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Cost	$ 667		$ 667		$ 661
Gross unrealized gains	239		239		233
Gross unrealized losses	(24)		(24)		(22)
Estimated fair value	882		882		872
Proceeds from sales	199	$ 138	380	$ 294
Gross realized gains	10	6	24	8
Gross realized losses	3	$ 3	5	$ 6
Short-term investments, primarily cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	23		23		21
Gross unrealized gains	0		0		0
Gross unrealized losses	0		0		0
Estimated fair value	23		23		21
Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	90		90		89
Gross unrealized gains	235		235		225
Gross unrealized losses	(4)		(4)		(2)
Estimated fair value	321		321		312
Total debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	577		577		558
Gross unrealized gains	4		4		8
Gross unrealized losses	(20)		(20)		(20)
Estimated fair value	561		561		546
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		61		50
Gross unrealized gains	1		1		2
Gross unrealized losses	(1)		(1)		(1)
Estimated fair value	61		61		51
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Cost	281		281		280
Gross unrealized gains	1		1		3
Gross unrealized losses	(9)		(9)		(8)
Estimated fair value	273		273		275
Other securities
Debt Securities, Available-for-sale [Line Items]
Cost	235		235		228
Gross unrealized gains	2		2		3
Gross unrealized losses	(10)		(10)		(11)
Estimated fair value	227		227		220
Receivables (payables), net
Debt Securities, Available-for-sale [Line Items]
Cost	(23)		(23)		(7)
Gross unrealized gains	0		0		0
Gross unrealized losses	0		0		0
Estimated fair value	$ (23)		$ (23)		$ (7)