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Environmental Developments (Textual) (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 Southern California Edison | Apr. 30, 2011 Southern California Edison | Jun. 30, 2011 Greenhouse Gas Litigation Developments companies | Dec. 31, 2012 Kivalina Litigation
Environmental Exit Cost [Line Items] |  |  |  |
Electricity requirements required to be purchased as per the law enacted by legislature (as a percent) |  | 33.00% |  |
Number of power companies against whom public nuisance claims are dismissed (companies) |  |  | 5 |
Damages sought in Kivalina case | $ 98 |  |  | $ 400

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