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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | $ 674 |  | $ 674 |  | $ 669
Gross unrealized gains | 234 |  | 234 |  | 227
Gross unrealized losses | (11) |  | (11) |  | (21)
Estimated fair value | 897 |  | 897 |  | 875
Proceeds from sales |  |  | 831 | $ 704 |
SDG&E |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Proceeds from sales | 210 | $ 259 | 709 | 639 |
Gross realized gains | 12 | 17 | 43 | 41 |
Gross realized losses | 1 | $ 2 | 6 | $ 7 |
Short-term investments, primarily cash equivalents |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 21 |  | 21 |  | 10
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | 0 |  | 0 |  | 0
Estimated fair value | 21 |  | 21 |  | 10
Equity securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 69 |  | 69 |  | 78
Gross unrealized gains | 225 |  | 225 |  | 223
Gross unrealized losses | (2) |  | (2) |  | (3)
Estimated fair value | 292 |  | 292 |  | 298
Total debt securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 604 |  | 604 |  | 596
Gross unrealized gains | 9 |  | 9 |  | 4
Gross unrealized losses | (9) |  | (9) |  | (18)
Estimated fair value | 604 |  | 604 |  | 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 | 53 |  | 53 |  | 67
Gross unrealized gains | 1 |  | 1 |  | 1
Gross unrealized losses | 0 |  | 0 |  | (1)
Estimated fair value | 54 |  | 54 |  | 67
Municipal bonds |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 299 |  | 299 |  | 295
Gross unrealized gains | 3 |  | 3 |  | 1
Gross unrealized losses | (6) |  | (6) |  | (9)
Estimated fair value | 296 |  | 296 |  | 287
Other securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 252 |  | 252 |  | 234
Gross unrealized gains | 5 |  | 5 |  | 2
Gross unrealized losses | (3) |  | (3) |  | (8)
Estimated fair value | 254 |  | 254 |  | 228
Receivables (payables), net |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | (20) |  | (20) |  | (15)
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | 0 |  | 0 |  | 0
Estimated fair value | $ (20) |  | $ (20) |  | $ (15)

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