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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Edison Mission Energy |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Parties | $ 325 |  |
Revenue from Related Parties | 2 | 7 | 5
Capistrano Wind Holdings |  |  |
Related Party Transaction [Line Items] |  |  |
Deferred Tax Allocation Credits Related Party | 120 | 36 |
Southern California Edison | Edison Mission Energy |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from Related Parties |  | 93 |
Purchase Commitment | Southern California Edison | Edison Mission Energy |  |  |
Related Party Transaction [Line Items] |  |  |
Long-term payables due to related party | $ 10 |  |

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