SAN ONOFRE NUCLEAR GENERATING STATION (Tables)

12 Months Ended

Dec. 31, 2023

Regulated Operations [Abstract]

Schedule of Nuclear Decommissioning Trusts

The following table shows the fair values and gross unrealized gains and losses for the securities held in the NDT on the Sempra and SDG&E Consolidated Balance Sheets. We provide additional fair value disclosures for the NDT in Note 12.

NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
	Cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
	December 31, 2023
Short-term investments, primarily cash equivalents	$	21	$	—	$	—	$	21
Equity securities	89		225		(2)		312
Debt securities:
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies(1)	50		2		(1)		51
Municipal bonds(2)	280		3		(8)		275
Other securities(3)	228		3		(11)		220
Total debt securities	558		8		(20)		546
Receivables (payables), net	(7)		—		—		(7)
Total	$	661	$	233	$	(22)	$	872
	December 31, 2022
Short-term investments, primarily cash equivalents	$	11	$	—	$	—	$	11
Equity securities	111		194		(8)		297
Debt securities:
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies	40		1		(1)		40
Municipal bonds	283		1		(14)		270
Other securities	248		—		(21)		227
Total debt securities	571		2		(36)		537
Receivables (payables), net	(4)		—		—		(4)
Total	$	689	$	196	$	(44)	$	841

(1)    Maturity dates are 2025-2054.

(2)    Maturity dates are 2024-2062.

(3)    Maturity dates are 2024-2072.

Schedule of Securities Sold

The following table shows the proceeds from sales of securities in the NDT and gross realized gains and losses on those sales.

SALES OF SECURITIES IN THE NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
	Years ended December 31,
	2023		2022		2021
Proceeds from sales	$	592	$	639	$	961
Gross realized gains	27		18		67
Gross realized losses	(14)		(20)		(5)