SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Cost	$ 661	$ 689
Gross unrealized gains	233	196
Gross unrealized losses	(22)	(44)
Estimated fair value	872	841
Proceeds from sales	592	639	$ 961
Gross realized gains	27	18	67
Gross realized losses	(14)	(20)	$ (5)
Short-term investments, primarily cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	21	11
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	21	11
Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	89	111
Gross unrealized gains	225	194
Gross unrealized losses	(2)	(8)
Estimated fair value	312	297
Domestic government and government agencies
Debt Securities, Available-for-sale [Line Items]
Cost	50	40
Gross unrealized gains	2	1
Gross unrealized losses	(1)	(1)
Estimated fair value	51	40
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Cost	280	283
Gross unrealized gains	3	1
Gross unrealized losses	(8)	(14)
Estimated fair value	275	270
Other securities
Debt Securities, Available-for-sale [Line Items]
Cost	228	248
Gross unrealized gains	3	0
Gross unrealized losses	(11)	(21)
Estimated fair value	220	227
Total debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	558	571
Gross unrealized gains	8	2
Gross unrealized losses	(20)	(36)
Estimated fair value	546	537
Receivables (payables), net
Debt Securities, Available-for-sale [Line Items]
Cost	(7)	(4)
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ (7)	$ (4)