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Investments (Nuclear Decommissioning Trusts) (Details) - Southern California Edison - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Other Investments [Line Items] |  |  |
Unrealized holding gains, net of losses | $ 1,500 |  | $ 1,600
Other-than-temporary impairments | 159 |  | $ 143
Deferred income taxes related to unrealized gains | 375 |  |
Nuclear decommissioning trusts | 4,000 |  |
Gross realized gains | 61 | $ 99 |
Gross realized losses | (8) | (16) |
Unrealized gains (losses), net of losses | $ (63) | $ 20 |

X
- 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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Balance Type: | credit
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X
- 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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Namespace Prefix: | eix_
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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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