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Income Taxes (Net Operating Loss and Tax Credit Carryforwards) (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Tax Credit Carryforward [Line Items] |
Loss Carryforwards, Expiring 2021 to 2038 | $ 1,073
Loss Carryforwards, No expiration date | 0
Loss Carryforwards | 1,073
Credit Carryforward, Expiring 2021 to 2038 | 469
Credit Carryforward, No expiration date | 11
Credit Carryforwards | 480
SCE |
Tax Credit Carryforward [Line Items] |
Loss Carryforwards, Expiring 2021 to 2038 | 203
Loss Carryforwards, No expiration date | 0
Loss Carryforwards | 203
Credit Carryforward, Expiring 2021 to 2038 | 26
Credit Carryforward, No expiration date | 22
Credit Carryforwards | $ 48

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