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Summary of Significant Accounting Policies (Emission Allowances and Energy Credits) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
LCFS net sales proceeds |  |
Significant Accounting Policies [Line Items] |  |
Regulatory liabilities | $ 176 | $ 184
SCE |  |
Significant Accounting Policies [Line Items] |  |
Regulatory liabilities | 9,158 | 9,357
SCE | Other current assets |  |
Significant Accounting Policies [Line Items] |  |
GHG allowances | 78 | 50
SCE | Other current liabilities |  |
Significant Accounting Policies [Line Items] |  |
GHG emission obligations | $ 64 | $ 50

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