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Commitments and Contingencies (San Onofre CPUC Proceedings) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 7,455 | $ 7,512
SCE |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 7,455 | 7,512
San Onofre | SCE |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 857 | $ 1,043

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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