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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | $ 668 |  | $ 669
Gross unrealized gains | 216 |  | 227
Gross unrealized losses | (19) |  | (21)
Estimated fair value | 865 |  | 875
Proceeds from sales | 274 | $ 181 |
Gross realized gains | 10 | 14 |
Gross realized losses | 2 | $ 2 |
Short-term investments, primarily cash equivalents |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 18 |  | 10
Gross unrealized gains | 0 |  | 0
Gross unrealized losses | 0 |  | 0
Estimated fair value | 18 |  | 10
Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 72 |  | 78
Gross unrealized gains | 211 |  | 223
Gross unrealized losses | (3) |  | (3)
Estimated fair value | 280 |  | 298
Total debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 596 |  | 596
Gross unrealized gains | 5 |  | 4
Gross unrealized losses | (16) |  | (18)
Estimated fair value | 585 |  | 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 | 61 |  | 67
Gross unrealized gains | 1 |  | 1
Gross unrealized losses | (1) |  | (1)
Estimated fair value | 61 |  | 67
Municipal bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 296 |  | 295
Gross unrealized gains | 1 |  | 1
Gross unrealized losses | (9) |  | (9)
Estimated fair value | 288 |  | 287
Other securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 239 |  | 234
Gross unrealized gains | 3 |  | 2
Gross unrealized losses | (6) |  | (8)
Estimated fair value | 236 |  | 228
Receivables (payables), net |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | (18) |  | (15)
Gross unrealized gains | 0 |  | 0
Gross unrealized losses | 0 |  | 0
Estimated fair value | $ (18) |  | $ (15)

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