v2.4.0.6

Variable Interest Entities and Unconsolidated Investments (Details 3) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2009 | Dec. 31, 2011 | Dec. 31, 2010
Variable Interest Entities and Unconsolidated Investments (Textuals) [Abstract] |  |  |
Equity Method Investment, Summarized Financial Information, Debt |  | $ 462 | $ 494
Prorata Share of Equity Method Investment, Summarized Financial Information, Debt |  | 231 | 247
Power generation capacity |  | 11,391 | 13,656
Revenues | 256 |  |
Operating expenses | 195 |  |
Income from operations | 61 |  |
Interest (income) expense | 2 |  |
Other (income) expense, net | 5 |  |
Net income | 54 |  |
Riverside and Otay Mesa [Member] |  |  |
Variable Interest Entities and Unconsolidated Investments (Textuals) [Abstract] |  |  |
Power generation capacity |  | 1,211 |
Inland Empire Energy Center [Member] |  |  |
Variable Interest Entities and Unconsolidated Investments (Textuals) [Abstract] |  |  |
Power generation capacity |  | 775 |
Put Option Exercise Period |  | 15 |
Minimum [Member] | Inland Empire Energy Center [Member] |  |  |
Variable Interest Entities and Unconsolidated Investments (Textuals) [Abstract] |  |  |
Call Option Exercise Period |  | 7 |
Maximum [Member] | Inland Empire Energy Center [Member] |  |  |
Variable Interest Entities and Unconsolidated Investments (Textuals) [Abstract] |  |  |
Call Option Exercise Period |  | 14 |
Greenfield [Member] |  |  |
Variable Interest Entities and Unconsolidated Investments (Textuals) [Abstract] |  |  |
Power generation capacity |  | 1,038 |
Equity Method Investment, Summarized Financial Information, Term Loan Period |  | 18 |
Equity Method Investment, Summarized Financial Information, Term Loan |  | $ 648 |
Project financing interest rate spread - Canadian LIBOR |  | 1.125% |
Project financing interest rate spread - Canadian Prime Rate |  | 0.125% |
Whitby [Member] |  |  |
Variable Interest Entities and Unconsolidated Investments (Textuals) [Abstract] |  |  |
Power generation capacity |  | 50 |

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