v2.4.0.6

Debt (Details 4) (USD $) | Dec. 31, 2011 | Dec. 31, 2010
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Schedule of Future Minimum Lease Payments for Capital Leases [Line Items] |  |  |
Power generation capacity | 11,391 |  | 13,656
Maximum Remaining Lease Term | 37 |  |
Minimum Lease Payments, Sale Leaseback Transactions [Abstract] |  |  |
Minimum Lease Payments, Sale Leaseback Transactions, within One Year | $ 41,000,000 | [1] |
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years | 38,000,000 | [1] |
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years | 26,000,000 | [1] |
Minimum Lease Payments, Sale Leaseback Transactions, within Four Years | 25,000,000 | [1] |
Minimum Lease Payments, Sale Leaseback Transactions, within Five Years | 25,000,000 | [1] |
Minimum Lease Payments, Sale Leaseback Transactions, Thereafter | 143,000,000 | [1] |
Minimum Lease Payments, Sale Leaseback Transactions | 298,000,000 | [1] |
Interest Portion of Minimum Lease Payments, Sale Leaseback Transactions | 110,000,000 | [1] |
Present Value of Future Minimum Lease Payments, Sale Leaseback Transactions | 188,000,000 | [1] |
Capital Leases, Future Minimum Payments Due [Abstract] |  |  |
Capital Leases, Future Minimum Payments Due, Current | 40,000,000 |  |
Capital Leases, Future Minimum Payments Due in Two Years | 38,000,000 |  |
Capital Leases, Future Minimum Payments Due in Three Years | 39,000,000 |  |
Capital Leases, Future Minimum Payments Due in Four Years | 37,000,000 |  |
Capital Leases, Future Minimum Payments Due in Five Years | 40,000,000 |  |
Capital Leases, Future Minimum Payments Due Thereafter | 200,000,000 |  |
Capital Leases, Future Minimum Payments Due | 394,000,000 |  |
Capital Leases, Future Minimum Payments, Interest Included in Payments | 170,000,000 |  |
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments | 224,000,000 |  |
Total Leases Future Minimum Payments [Abstract] |  |  |
Total Leases, Future Minimum Payments Due, Current | 81,000,000 |  |
Total Leases, Future Minimum Payments Due in Two Years | 76,000,000 |  |
Total Leases, Future Minimum Payments Due in Three Years | 65,000,000 |  |
Total Leases, Future Minimum Payments Due in Four Years | 62,000,000 |  |
Total Leases, Future Minimum Payments Due in Five Years | 65,000,000 |  |
Total Leases, Future Minimum Payments Due Thereafter | 343,000,000 |  |
Total Leases, Future Minimum Payments Due | 692,000,000 |  |
Total Leases, Future Minimum Payments, Interest Included in Payments | 280,000,000 |  |
Total Leases, Future Minimum Payments, Present Value of Net Minimum Payments | 412,000,000 |  |
Lease Assets, Historical Cost | 1,000,000,000 |  | 1,000,000,000
Lease Assets, Accumulated Depreciation | $ 340,000,000 |  | $ 312,000,000
[1] | Amounts are accounted for as financing transactions under U.S. GAAP and are included in our project financing, notes payable and other amounts above.

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- Definition Amount necessary to reduce net minimum lease payments to present value calculated at the lesser of the interest rate implicit in the lease (if known) or the entity's incremental borrowing rate (as defined) at inception of the lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 10 -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 Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph a(ii) -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 7 -Subparagraph d -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The future minimum lease payments as of the date of the latest balance sheet presented, with separate deductions from the total for the amount representing executory costs, including any profit thereon, required under all transactions involving the sale of property to another party and the lease of the property back to the seller, which payments are due in the third year following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6456377&loc=d3e50824-112756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph a(ii) -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 98 -Paragraph 18 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The future minimum lease payments as of the date of the latest balance sheet presented, with separate deductions from the total for the amount representing executory costs, including any profit thereon, required under all transactions involving the sale of property to another party and the lease of the property back to the seller, which payments are due in the second year following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6456377&loc=d3e50824-112756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph a(ii) -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 98 -Paragraph 18 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The total of all minimum lease payments required under all transactions involving the sale of property to another party and the lease of the property back to the seller accounted for as capital leases, under the deposit method, or as a financing less the portion that will be accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph a -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 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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