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Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Accounts receivable - noncurrent | [1] | $ 258 | $ 270
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 15,633 | 15,461
Recourse debt |  | 4,924 | 4,966
Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Value added tax |  | 24 | 27
Accounts receivable - noncurrent | [1] | 337 | 342
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 16,064 | 15,939
Recourse debt |  | 4,998 | 4,696
Level 1 [Member] | Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Accounts receivable - noncurrent | [1] | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 0 | 0
Recourse debt |  | 0 | 0
Level 2 [Member] | Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Accounts receivable - noncurrent | [1] | 0 | 20
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 13,654 | 13,672
Recourse debt |  | 4,998 | 4,696
Level 3 [Member] | Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Accounts receivable - noncurrent | [1] | 337 | 322
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 2,410 | 2,267
Recourse debt |  | $ 0 | $ 0
[1] | These amounts principally relate to amounts due from CAMMESA, and are included in Noncurrent assets—Other in the accompanying Condensed Consolidated Balance Sheets. The fair value and carrying amount of these receivables exclude VAT of $24 million and $27 million as of March 31, 2016 and December 31, 2015, respectively.

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- Definition Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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- Definition Carrying amount due after one year of the balance sheet date (or one operating cycle), if longer of value added taxes due either from customers arising from sales on credit terms, or as previously overpaid to tax authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 + Details
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