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Variable Interest Entities and Unconsolidated Investments (Details 3) (Details)
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3 Months Ended | 3 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2012
USD ($)
|
Dec. 31, 2011
USD ($)
|
Mar. 31, 2012
Riverside and Otay Mesa [Member]
|
Mar. 31, 2012
Inland Empire Energy Center [Member]
|
Mar. 31, 2012
Minimum [Member]
Inland Empire Energy Center [Member]
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Mar. 31, 2012
Maximum [Member]
Inland Empire Energy Center [Member]
|
Mar. 31, 2012
Greenfield [Member]
USD ($)
|
Mar. 31, 2011
Greenfield [Member]
USD ($)
|
Mar. 31, 2012
Greenfield [Member]
CAD
|
Mar. 31, 2012
Whitby [Member]
USD ($)
|
Mar. 31, 2011
Whitby [Member]
USD ($)
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| Schedule of Equity Method Investments [Line Items] | |||||||||||
| Equity Method Investment, Ownership Percentage | 50.00% | 50.00% | |||||||||
| Variable Interest Entities and Unconsolidated Investments (Textuals) [Abstract] | |||||||||||
| Equity Method Investment, Summarized Financial Information, Debt | $ 466,000,000 | $ 462,000,000 | |||||||||
| Prorata Share of Equity Method Investment, Summarized Financial Information, Debt | 233,000,000 | 231,000,000 | |||||||||
| Call Option Exercise Period | 7 | 14 | |||||||||
| Power generation capacity | 11,392 | 11,391 | 1,211 | 775 | 1,038 | 50 | |||||
| Equity Method Investment, Summarized Financial Information, Term Loan Period | 18 | ||||||||||
| Equity Method Investment, Summarized Financial Information, Term Loan | 648,000,000 | ||||||||||
| Project financing interest rate spread - Canadian LIBOR | 1.125% | ||||||||||
| Project financing interest rate spread - Canadian Prime Rate | 0.125% | ||||||||||
| Return on investment in unconsolidated subsidiaries | 0 | 0 | 0 | 0 | |||||||
| Put Option Exercise Period | 15 | ||||||||||
| Revenues | 57,000,000 | 67,000,000 | |||||||||
| Operating expenses | 40,000,000 | 50,000,000 | |||||||||
| Income from operations | 17,000,000 | 17,000,000 | |||||||||
| Interest (income) expense | 7,000,000 | 7,000,000 | |||||||||
| Other (income) expense, net | (2,000,000) | 0 | |||||||||
| Net income | $ 12,000,000 | $ 10,000,000 | |||||||||