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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Government Of Panama [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Electricity Sales To Government | $ 144 | $ 146 | $ 143
Electricity Purchases Excluding Transmission Charges | 65 | 21 | 25
Due To Related Parties | 1 | 4 |
Receivable From Government | 19 | 12 |
Government Of Dominican Republic [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Electricity Sales To Government | 227 | 179 | 204
Receivable From Government | $ 100 | $ 88 |
Mong Duong [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Equity interest sold | 19.00% |  |

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