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SAN ONOFRE NUCLEAR GENERATING STATION (Tables)
 9 Months Ended
Sep. 30, 2024
Public Utilities, General Disclosures [Abstract]  
Schedule of Nuclear Decommissioning Trusts Investments
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 Condensed Consolidated Balance Sheets. We provide additional fair value disclosures for the NDT in Note 8.
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
 CostGross
unrealized
gains		Gross
unrealized
losses		Estimated
fair
value
September 30, 2024
Short-term investments, primarily cash equivalents$18 $— $— $18 
Equity securities80 241 (2)319 
Debt securities:    
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies(1)
69 1 — 70 
Municipal bonds(2)
290 3 (6)287 
Other securities(3)
233 4 (6)231 
Total debt securities592 8 (12)588 
Receivables (payables), net(19)— — (19)
Total$671 $249 $(14)$906 
December 31, 2023
Short-term investments, primarily cash equivalents$21 $— $— $21 
Equity securities89 225 (2)312 
Debt securities:    
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies50 2 (1)51 
Municipal bonds280 3 (8)275 
Other securities228 3 (11)220 
Total debt securities558 8 (20)546 
Receivables (payables), net(7)— — (7)
Total$661 $233 $(22)$872 
(1)    Maturity dates are 2025-2055.
(2)    Maturity dates are 2024-2062.
(3)    Maturity dates are 2024-2072.
Schedule of Sales of Securities By Nuclear Decommissioning Trusts
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)
 Three months ended September 30,Nine months ended September 30,
 2024202320242023
Proceeds from sales$259 $143 $639 $437 
Gross realized gains17 12 41 20 
Gross realized losses2 3 7 9