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Summary of Significant Accounting Policies (Emission Allowances) (Details) - SCE - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Significant Accounting Policies [Line Items] |  |
Regulatory liabilities | $ 9,175 | $ 9,584
LCFS net sales proceeds |  |
Significant Accounting Policies [Line Items] |  |
Regulatory liabilities | 218 | 193
Other Current Assets |  |
Significant Accounting Policies [Line Items] |  |
GHG allowances | 87 | 47
GHG emission obligations | $ 55 |
Other Current Liabilities |  |
Significant Accounting Policies [Line Items] |  |
GHG emission obligations |  | $ 34

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