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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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