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Summary of Significant Accounting Policies (Prepaid Insurance) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2022 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Wildfire Insurance Fund contributions, noncurrent |  |  | $ 2,359 | $ 2,443 |
Wildfire Insurance Fund contributions, current |  |  | 204 | 323 |
Wildfire Insurance Fund contributions |  |  | $ 95 | $ 95 | $ 2,457
Insurance fund contribution amortization period | 15 years |  |  |  |
Measurement Input |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Historical term used in estimate | 8 years |  | 7 years | 5 years |
Wildfire Insurance Fund |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Wildfire Insurance Fund contributions, noncurrent |  |  | $ 2,400 |  |
Wildfire Insurance Fund contributions, current |  |  | 204 |  |
Wildfire Insurance Fund contributions |  | $ 2,400 |  |  |
Wildfire Insurance Fund liability, noncurrent |  |  | $ 620 |  |
Insurance fund contribution amortization period |  |  | 15 years | 10 years |
SCE |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Wildfire Insurance Fund contributions, noncurrent |  |  | $ 2,359 | $ 2,443 |
Wildfire Insurance Fund contributions, current |  |  | 204 | 323 |
Wildfire Insurance Fund contributions |  |  | $ 95 | $ 95 | $ 2,457

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- Definition Capitalized Insurance Fund Contribution, Amortization Period, Measurement Input + 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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