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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | $ 661 | $ 689 |
Gross unrealized gains | 233 | 196 |
Gross unrealized losses | (22) | (44) |
Estimated fair value | 872 | 841 |
Proceeds from sales | 592 | 639 | $ 961
Gross realized gains | 27 | 18 | 67
Gross realized losses | (14) | (20) | $ (5)
Short-term investments, primarily cash equivalents |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 21 | 11 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | 0 |
Estimated fair value | 21 | 11 |
Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 89 | 111 |
Gross unrealized gains | 225 | 194 |
Gross unrealized losses | (2) | (8) |
Estimated fair value | 312 | 297 |
Domestic government and government agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 50 | 40 |
Gross unrealized gains | 2 | 1 |
Gross unrealized losses | (1) | (1) |
Estimated fair value | 51 | 40 |
Municipal bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 280 | 283 |
Gross unrealized gains | 3 | 1 |
Gross unrealized losses | (8) | (14) |
Estimated fair value | 275 | 270 |
Other securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 228 | 248 |
Gross unrealized gains | 3 | 0 |
Gross unrealized losses | (11) | (21) |
Estimated fair value | 220 | 227 |
Total debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 558 | 571 |
Gross unrealized gains | 8 | 2 |
Gross unrealized losses | (20) | (36) |
Estimated fair value | 546 | 537 |
Receivables (payables), net |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | (7) | (4) |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | 0 |
Estimated fair value | $ (7) | $ (4) |

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