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Investments (Nuclear Decommissioning Trusts) (Details) - Southern California Edison - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Other Investments [Line Items]
Unrealized holding gains, net of losses	$ 1,600	$ 1,400
Deferred income taxes related to unrealized gains	383
Nuclear decommissioning trusts	$ 4,000

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- Definition

Decommissioning Fund Investments, Fair Value, Net of Deferred Income Tax

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- Definition

Decommissioning Trust, Deferred Income Taxes

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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.

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