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Income Taxes (Net Operating Loss and Tax Credit Carryforwards) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Tax Credit Carryforward [Line Items] |
Loss Carryforwards, Expiring 2018 to 2036 | $ 901
Loss Carryforwards, No expiration date | 0
Loss Carryforwards | 901
Credit Carryforward, Expiring 2018 to 2036 | 451
Credit Carryforward, No expiration date | 71
Credit Carryforwards | 522
SCE |
Tax Credit Carryforward [Line Items] |
Loss Carryforwards, Expiring 2018 to 2036 | 162
Loss Carryforwards, No expiration date | 0
Loss Carryforwards | 162
Credit Carryforward, Expiring 2018 to 2036 | 25
Credit Carryforward, No expiration date | 38
Credit Carryforwards | $ 63

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