SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Cost	$ 669		$ 669		$ 669
Gross unrealized gains	225		225		227
Gross unrealized losses	(16)		(16)		(21)
Estimated fair value	878		878		875
Proceeds from sales			580	$ 442
SDG&E
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales	225	$ 199	499	380
Gross realized gains	21	10	31	24
Gross realized losses	3	$ 3	5	$ 5
Short-term investments, primarily cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	16		16		10
Gross unrealized gains	0		0		0
Gross unrealized losses	0		0		0
Estimated fair value	16		16		10
Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	69		69		78
Gross unrealized gains	218		218		223
Gross unrealized losses	(2)		(2)		(3)
Estimated fair value	285		285		298
Total debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	596		596		596
Gross unrealized gains	7		7		4
Gross unrealized losses	(14)		(14)		(18)
Estimated fair value	589		589		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	48		48		67
Gross unrealized gains	2		2		1
Gross unrealized losses	(1)		(1)		(1)
Estimated fair value	49		49		67
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Cost	302		302		295
Gross unrealized gains	1		1		1
Gross unrealized losses	(9)		(9)		(9)
Estimated fair value	294		294		287
Other securities
Debt Securities, Available-for-sale [Line Items]
Cost	246		246		234
Gross unrealized gains	4		4		2
Gross unrealized losses	(4)		(4)		(8)
Estimated fair value	246		246		228
Receivables (payables), net
Debt Securities, Available-for-sale [Line Items]
Cost	(12)		(12)		(15)
Gross unrealized gains	0		0		0
Gross unrealized losses	0		0		0
Estimated fair value	$ (12)		$ (12)		$ (15)

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Securities Held in Nuclear Decommissioning Trusts, Accumulated Gross Unrealized Gain, before Tax

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The cash inflow from the sale of assets held in a decommissioning trust fund.

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