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Summary of Significant Accounting Policies (Prepaid Insurance) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2019
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Wildfire Insurance Fund contributions, noncurrent |  | $ 1,951 | $ 2,155 |  |
Wildfire Insurance Fund contributions, current |  | 204 | 204 |  |
Wildfire Insurance Fund contributions |  | $ 95 | $ 95 | $ 95 |
Measurement Input |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Historical term used in estimate | 10 years | 9 years | 8 years |  |
Wildfire Insurance Fund |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Wildfire Insurance Fund contributions, noncurrent |  | $ 2,000 | $ 2,200 |  |
Wildfire Insurance Fund contributions, current |  | 204 | 204 |  |
Wildfire Insurance Fund contributions |  |  |  |  | $ 2,400
Wildfire Insurance Fund liability, noncurrent |  | $ 450 | $ 536 |  |
Insurance fund contribution amortization period | 20 years | 15 years | 15 years |  |
SCE |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Wildfire Insurance Fund contributions, noncurrent |  | $ 1,951 | $ 2,155 |  |
Wildfire Insurance Fund contributions, current |  | 204 | 204 |  |
Wildfire Insurance Fund contributions |  | $ 95 | $ 95 | $ 95 |

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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 Insurance Fund, Liability, Noncurrent + References No definition available. + Details
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- Definition Prepaid Wildfire Insurance, Noncurrent + 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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- Details
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