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Regulatory Assets and Liabilities (Textual) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 San Onofre (nuclear) | May 31, 2013 San Onofre (nuclear) | Jun. 30, 2013 Nuclear fuel supply commitments Estimated costs related to contract cancellation and management San Onofre (nuclear)
Regulatory Assets [Line Items] |  |  |  |  |
Amount of assets reclassified to a regulatory asset |  |  |  | $ 1,521 |
Cost of service |  |  | 56 |  |
Increase in regulatory assets |  |  | 32 |  |
Regulatory asset | $ 8,297 | $ 6,994 |  |  | $ 33

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- Definition Public Utilities Cost Of Service for Severance + References No definition available. + Details
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- Definition Reclassification To Regulatory Assets Amount + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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