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Investments (Nuclear Decommissioning Trusts) (Details) - Southern California Edison - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Other Investments [Line Items] |  |  |  |  |
Unrealized holding gains, net of losses | $ 1,500 |  | $ 1,500 |  | $ 1,600
Other-than-temporary impairments |  |  | 151 |  | $ 143
Deferred income taxes related to unrealized gains | 382 |  | 382 |  |
Nuclear decommissioning trusts | 3,900 |  | 3,900 |  |
Gross realized gains | 28 | $ 22 | 115 | $ 134 |
Gross realized losses | (7) | (3) | (17) | (19) |
Unrealized gains (losses), net of losses | $ 72 | $ 62 | $ 4 | $ 141 |

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- Definition Debt and Equity Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax + References No definition available. + Details
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- Definition Decommissioning Fund Investments, Fair Value, Net of Deferred Income Tax + References No definition available. + Details
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- Definition Decommissioning Trust, Deferred Income Taxes + References No definition available. + Details
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- Definition Discloses the amount of other than temporary decline in value that has been recognized by the decommissioning trust during the period. + References No definition available. + Details
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- Definition This item represents the amount of realized gain on investments in trust during the period from the sale of securities. + References No definition available. + Details
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- Definition This item represents the amount of realized loss on investments in trust during the period from the sale of securities. + References No definition available. + Details
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- Definition This item represents the amount of net unrealized gain on investments in trust during the period. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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