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Income Taxes (Net Operating Loss and Tax Credit Carryforwards) (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Tax Credit Carryforward [Line Items] |
Loss Carryforwards, Expiring in one year | $ 4
Loss Carryforwards, Expiring between 2022 to 2045 | 31
Loss Carryforwards, Expiring between 2029 to 2042 | 1,192
Loss Carryforwards, No expiration date | 509
Loss Carryforwards | 1,736
Tax Credit Carryforward, Expiring in one year | 0
Tax Credit Carryforward, Expiring In Years Two Through Five | 0
Credit Carryforward, Expiring 2029 to 2042 | 515
Credit Carryforward, No expiration date | 10
Credit Carryforwards | 525
SCE |
Tax Credit Carryforward [Line Items] |
Loss Carryforwards, Expiring in one year | 4
Loss Carryforwards, Expiring between 2022 to 2045 | 26
Loss Carryforwards, Expiring between 2029 to 2042 | 380
Loss Carryforwards, No expiration date | 413
Loss Carryforwards | 823
Tax Credit Carryforward, Expiring in one year | 0
Tax Credit Carryforward, Expiring In Years Two Through Five | 0
Credit Carryforward, Expiring 2029 to 2042 | 50
Credit Carryforward, No expiration date | 0
Credit Carryforwards | $ 50

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