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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | $ 673 |  | $ 673 |  | $ 689
Gross unrealized gains | 224 |  | 224 |  | 196
Gross unrealized losses | (34) |  | (34) |  | (44)
Estimated fair value | 863 |  | 863 |  | 841
Proceeds from sales | 138 | $ 155 | 294 | $ 397 |
Gross realized gains | 6 | 3 | 8 | 14 |
Gross realized losses | (3) | $ (7) | (6) | $ (11) |
Total debt securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 551 |  | 551 |  | 571
Gross unrealized gains | 2 |  | 2 |  | 2
Gross unrealized losses | (30) |  | (30) |  | (36)
Estimated fair value | 523 |  | 523 |  | 537
U.S. government corporations and agencies |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 40 |  | 40 |  | 40
Gross unrealized gains | 1 |  | 1 |  | 1
Gross unrealized losses | (2) |  | (2) |  | (1)
Estimated fair value | 39 |  | 39 |  | 40
Municipal bonds |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 277 |  | 277 |  | 283
Gross unrealized gains | 1 |  | 1 |  | 1
Gross unrealized losses | (12) |  | (12) |  | (14)
Estimated fair value | 266 |  | 266 |  | 270
Other securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 234 |  | 234 |  | 248
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | (16) |  | (16) |  | (21)
Estimated fair value | 218 |  | 218 |  | 227
Equity securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 104 |  | 104 |  | 111
Gross unrealized gains | 222 |  | 222 |  | 194
Gross unrealized losses | (4) |  | (4) |  | (8)
Estimated fair value | 322 |  | 322 |  | 297
Short-term investments, primarily cash equivalents |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 24 |  | 24 |  | 11
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | 0 |  | 0 |  | 0
Estimated fair value | 24 |  | 24 |  | 11
Receivables (payables), net |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | (6) |  | (6) |  | (4)
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | 0 |  | 0 |  | 0
Estimated fair value | $ (6) |  | $ (6) |  | $ (4)

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