SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs	$ 669	$ 661
Gross unrealized gains	227	233
Gross unrealized losses	(21)	(22)
Estimated fair value	875	872
Proceeds from sales	874	592	$ 639
Gross realized gains	57	27	18
Gross realized losses	10	14	$ 20
Short-term investments, primarily cash equivalents
Debt Securities, Available-for-sale [Line Items]
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs	10	21
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	10	21
Equity securities
Debt Securities, Available-for-sale [Line Items]
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs	78	89
Gross unrealized gains	223	225
Gross unrealized losses	(3)	(2)
Estimated fair value	298	312
Domestic government and government agencies
Debt Securities, Available-for-sale [Line Items]
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs	67	50
Gross unrealized gains	1	2
Gross unrealized losses	(1)	(1)
Estimated fair value	67	51
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs	295	280
Gross unrealized gains	1	3
Gross unrealized losses	(9)	(8)
Estimated fair value	287	275
Other securities
Debt Securities, Available-for-sale [Line Items]
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs	234	228
Gross unrealized gains	2	3
Gross unrealized losses	(8)	(11)
Estimated fair value	228	220
Total debt securities
Debt Securities, Available-for-sale [Line Items]
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs	596	558
Gross unrealized gains	4	8
Gross unrealized losses	(18)	(20)
Estimated fair value	582	546
Receivables (payables), net
Debt Securities, Available-for-sale [Line Items]
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs	(15)	(7)
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ (15)	$ (7)