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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | $ 667 |  | $ 667 |  | $ 661
Gross unrealized gains | 239 |  | 239 |  | 233
Gross unrealized losses | (24) |  | (24) |  | (22)
Estimated fair value | 882 |  | 882 |  | 872
Proceeds from sales | 199 | $ 138 | 380 | $ 294 |
Gross realized gains | 10 | 6 | 24 | 8 |
Gross realized losses | 3 | $ 3 | 5 | $ 6 |
Short-term investments, primarily cash equivalents |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 23 |  | 23 |  | 21
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | 0 |  | 0 |  | 0
Estimated fair value | 23 |  | 23 |  | 21
Equity securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 90 |  | 90 |  | 89
Gross unrealized gains | 235 |  | 235 |  | 225
Gross unrealized losses | (4) |  | (4) |  | (2)
Estimated fair value | 321 |  | 321 |  | 312
Total debt securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 577 |  | 577 |  | 558
Gross unrealized gains | 4 |  | 4 |  | 8
Gross unrealized losses | (20) |  | (20) |  | (20)
Estimated fair value | 561 |  | 561 |  | 546
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 |  | 61 |  | 50
Gross unrealized gains | 1 |  | 1 |  | 2
Gross unrealized losses | (1) |  | (1) |  | (1)
Estimated fair value | 61 |  | 61 |  | 51
Municipal bonds |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 281 |  | 281 |  | 280
Gross unrealized gains | 1 |  | 1 |  | 3
Gross unrealized losses | (9) |  | (9) |  | (8)
Estimated fair value | 273 |  | 273 |  | 275
Other securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 235 |  | 235 |  | 228
Gross unrealized gains | 2 |  | 2 |  | 3
Gross unrealized losses | (10) |  | (10) |  | (11)
Estimated fair value | 227 |  | 227 |  | 220
Receivables (payables), net |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | (23) |  | (23) |  | (7)
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | 0 |  | 0 |  | 0
Estimated fair value | $ (23) |  | $ (23) |  | $ (7)

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