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Summary of Significant Accounting Policies (Emission Allowances) (Details) - SCE - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Significant Accounting Policies [Line Items] |  |
Regulatory liabilities | $ 9,861 | $ 9,735
LCFS net sales proceeds |  |
Significant Accounting Policies [Line Items] |  |
Regulatory liabilities | 103 | 24
Other Current Assets |  |
Significant Accounting Policies [Line Items] |  |
GHG allowances | 38 | 127
Other Current Liabilities |  |
Significant Accounting Policies [Line Items] |  |
GHG emission obligations | $ 30 | $ 129

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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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