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Non-Recourse Debt (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Nonrecourse Debt Default [Line Items] |  |
Default | $ 1,304 |
Gains Losses On Extinguishment Of Debt | (47) | 0
Sonel [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Net Assets | 361 |
Maritza [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Net Assets | 576 |
Saurashtra [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Net Assets | 15 |
Kavarna [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Net Assets | 82 |
Tiete [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Debt Instrument, Increase, Additional Borrowings | 251 |
Debt Instrument, Decrease, Repayments | 60 |
El Salvador [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Debt Instrument, Increase, Additional Borrowings | 310 |
Debt Instrument, Decrease, Repayments | 150 |
Sul [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Debt Instrument, Increase, Additional Borrowings | 150 |
Debt Instrument, Decrease, Repayments | 34 |
Mong Duong [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Debt Instrument, Increase, Additional Borrowings | 119 |
Masinloc [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Debt Instrument, Increase, Additional Borrowings | 500 |
Gains Losses On Extinguishment Of Debt | (43) |
Extinguishment of Debt, Amount | 500 |
Covenant Violation [Member] | Sonel [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Default | 264 |
Covenant Violation [Member] | Maritza [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Default | 819 |
Covenant Violation [Member] | Kavarna [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Default | 196 |
Payment Default [Member] | Saurashtra [Member] |  |
Nonrecourse Debt Default [Line Items] |  |
Default | $ 25 |

X
- Definition Amount of outstanding debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured. + References No definition available. + Details
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- Definition The net of assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Paragraph 19 -Article 6 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09.6,7) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606914-122999 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05.4) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604008-122996 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph 4 -Article 6 + Details
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- Definition Decrease for amounts repaid on the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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- Definition Increase of additional borrowings on existing and new debt instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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