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Summary of Significant Accounting Policies (Prepaid Insurance) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Wildfire Insurance Fund contributions long term |  |  | $ 2,400 | $ 2,800 |
Wildfire Insurance Fund contributions current |  |  | 323 | 323 |
Wildfire Insurance Fund contributions |  |  | 95 | 2,457 | $ 0
Insurance fund liability included in other long-term liabilities |  |  | $ 703 | 785 |
Amortization period |  |  | 10 years |  |
Subsequent event |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Amortization period | 15 years |  |  |  |
Measurement Input |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Historical term used in estimate |  |  | 5 years |  |
Measurement Input | Subsequent event |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Historical term used in estimate | 7 years |  |  |  |
SCE |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Wildfire Insurance Fund contributions long term |  |  | $ 2,400 | 2,800 |
Wildfire Insurance Fund contributions current |  |  | 323 | 323 |
Wildfire Insurance Fund contributions |  | $ 2,400 | 95 | 2,457 | $ 0
Insurance fund liability included in other long-term liabilities |  |  | $ 703 | $ 785 |
Amortization period |  |  | 10 years |  |

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- Definition Capitalized Insurance Fund Contribution, Amortization Period + References No definition available. + Details
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- Definition Capitalized Insurance Fund Contribution, Amortization Period, Measurement Input + References No definition available. + Details
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- Definition Insurance Fund, Contribution, Current + References No definition available. + Details
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- Definition Prepaid Wildfire Insurance, Current + References No definition available. + Details
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- Definition Wildfire Insurance Fund Contributions + References No definition available. + Details
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- Details
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- Details
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