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Investments (Nuclear Decommissioning Trusts) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investment Holdings [Line Items] |  |  |
Unrealized holding gains, net of losses | $ 1,600 | $ 1,500 |
Other-than-temporary impairments | 143 | 170 |
Deferred income taxes related to unrealized gains | 404 |  |
Nuclear decommissioning trusts | 4,000 |  |
Gross realized gains | 244 | 92 | $ 326
Gross realized losses | $ (23) | $ (19) | $ (26)

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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 Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + 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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