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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs | $ 669 | $ 661 |
Gross unrealized gains | 227 | 233 |
Gross unrealized losses | (21) | (22) |
Estimated fair value | 875 | 872 |
Proceeds from sales | 874 | 592 | $ 639
Gross realized gains | 57 | 27 | 18
Gross realized losses | 10 | 14 | $ 20
Short-term investments, primarily cash equivalents |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs | 10 | 21 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | 0 |
Estimated fair value | 10 | 21 |
Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs | 78 | 89 |
Gross unrealized gains | 223 | 225 |
Gross unrealized losses | (3) | (2) |
Estimated fair value | 298 | 312 |
Domestic government and government agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs | 67 | 50 |
Gross unrealized gains | 1 | 2 |
Gross unrealized losses | (1) | (1) |
Estimated fair value | 67 | 51 |
Municipal bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs | 295 | 280 |
Gross unrealized gains | 1 | 3 |
Gross unrealized losses | (9) | (8) |
Estimated fair value | 287 | 275 |
Other securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs | 234 | 228 |
Gross unrealized gains | 2 | 3 |
Gross unrealized losses | (8) | (11) |
Estimated fair value | 228 | 220 |
Total debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs | 596 | 558 |
Gross unrealized gains | 4 | 8 |
Gross unrealized losses | (18) | (20) |
Estimated fair value | 582 | 546 |
Receivables (payables), net |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities Held In Nuclear Decommissioning Trusts, Amortized Costs | (15) | (7) |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | 0 |
Estimated fair value | $ (15) | $ (7) |

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