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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | $ 734 |  | $ 731
Gross unrealized gains | 310 |  | 259
Gross unrealized losses | (7) |  | (16)
Estimated fair value | 1,037 |  | 974
Proceeds from sales | 225 | $ 210 |
Gross realized gains | 5 | 4 |
Gross realized losses | (2) | $ (3) |
Total debt securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 555 |  | 556
Gross unrealized gains | 11 |  | 6
Gross unrealized losses | (1) |  | (6)
Estimated fair value | 565 |  | 556
U.S. government corporations and agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 48 |  | 52
Gross unrealized gains | 0 |  | 1
Gross unrealized losses | 0 |  | 0
Estimated fair value | 48 |  | 53
Municipal bonds [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 271 |  | 266
Gross unrealized gains | 8 |  | 4
Gross unrealized losses | 0 |  | (1)
Estimated fair value | 279 |  | 269
Other securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 236 |  | 238
Gross unrealized gains | 3 |  | 1
Gross unrealized losses | (1) |  | (5)
Estimated fair value | 238 |  | 234
Equity securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 166 |  | 168
Gross unrealized gains | 299 |  | 253
Gross unrealized losses | (6) |  | (10)
Estimated fair value | 459 |  | 411
Cash and cash equivalents [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 13 |  | 7
Gross unrealized gains | 0 |  | 0
Gross unrealized losses | 0 |  | 0
Estimated fair value | $ 13 |  | $ 7

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