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Other Non-Operating Expense (Details) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 MW | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Elsta MW | Dec. 31, 2012 Elsta | Dec. 31, 2011 Elsta | Mar. 31, 2012 China generation and wind | Dec. 31, 2013 China generation and wind | Dec. 31, 2012 China generation and wind | Dec. 31, 2011 China generation and wind | Mar. 31, 2012 InnoVent | Dec. 31, 2013 InnoVent | Dec. 31, 2012 InnoVent | Dec. 31, 2011 InnoVent | Dec. 31, 2013 Other | Dec. 31, 2012 Other | Dec. 31, 2011 Other | Dec. 31, 2011 Yangcheng MW | Sep. 30, 2011 Yangcheng
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other non-operating expense | $ 129,000,000 | $ 50,000,000 | $ 82,000,000 | $ 129,000,000 | $ 0 | $ 0 |  | $ 0 | $ 32,000,000 | $ 79,000,000 |  | $ 0 | $ 17,000,000 | $ 0 | $ 0 | $ 1,000,000 | $ 3,000,000 | $ 74,000,000 |
Production Capacity (MW) | 2,465 |  |  | 630 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100 |
Equity method investment ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |
Equity method investment, other than temporary impairment |  |  |  | 129,000,000 |  |  | 32,000,000 |  |  |  | 17,000,000 |  |  |  |  |  |  | 79,000,000 |
Equity method investment |  |  |  | 240,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value |  |  |  | 111,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000
Assets, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,000,000

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