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Investments (Nuclear Decommissioning Trusts) (Details) - Southern California Edison - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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 |  |  | 159 |  | $ 143
Deferred income taxes related to unrealized gains | 370 |  | 370 |  |
Nuclear decommissioning trusts | 3,900 |  | 3,900 |  |
Gross realized gains | 26 | $ 13 | 87 | $ 112 |
Gross realized losses | (2) | 0 | (10) | (16) |
Unrealized gains (losses), net of losses | $ (5) | $ 59 | $ (68) | $ 79 |

X
- 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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Namespace Prefix: | eix_
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Balance Type: | credit
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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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Namespace Prefix: | eix_
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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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Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
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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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