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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | $ 668 |  | $ 668 |  | $ 689
Gross unrealized gains | 203 |  | 203 |  | 196
Gross unrealized losses | (44) |  | (44) |  | (44)
Estimated fair value | 827 |  | 827 |  | 841
Proceeds from sales | 143 | $ 133 | 437 | $ 530 |
Gross realized gains | 12 | 2 | 20 | 16 |
Gross realized losses | (3) | $ (3) | (9) | $ (14) |
Total debt securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 556 |  | 556 |  | 571
Gross unrealized gains | 2 |  | 2 |  | 2
Gross unrealized losses | (39) |  | (39) |  | (36)
Estimated fair value | 519 |  | 519 |  | 537
U.S. government corporations and agencies |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 44 |  | 44 |  | 40
Gross unrealized gains | 1 |  | 1 |  | 1
Gross unrealized losses | (2) |  | (2) |  | (1)
Estimated fair value | 43 |  | 43 |  | 40
Municipal bonds |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 278 |  | 278 |  | 283
Gross unrealized gains | 0 |  | 0 |  | 1
Gross unrealized losses | (18) |  | (18) |  | (14)
Estimated fair value | 260 |  | 260 |  | 270
Other securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 234 |  | 234 |  | 248
Gross unrealized gains | 1 |  | 1 |  | 0
Gross unrealized losses | (19) |  | (19) |  | (21)
Estimated fair value | 216 |  | 216 |  | 227
Equity securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost | 99 |  | 99 |  | 111
Gross unrealized gains | 201 |  | 201 |  | 194
Gross unrealized losses | (5) |  | (5) |  | (8)
Estimated fair value | 295 |  | 295 |  | 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 | (11) |  | (11) |  | (4)
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | 0 |  | 0 |  | 0
Estimated fair value | $ (11) |  | $ (11) |  | $ (4)

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