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Debt - Non-Recourse Debt Narrative (Details) (Nonrecourse Debt [Member], USD $) | 6 Months Ended
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Jun. 30, 2014
Gener Subsidiary [Member] |
Debt Instrument [Line Items] |
Issued new debt | $ 700,000,000
Repayments of debt | 853,000,000
IPL Subsidiary [Member] |
Debt Instrument [Line Items] |
Issued new debt | 130,000,000
Tiete Subsidiary [Member] |
Debt Instrument [Line Items] |
Issued new debt | 129,000,000
Repayments of debt | 132,000,000
Alto Maipo [Member] |
Debt Instrument [Line Items] |
Issued new debt | 103,000,000
Construction Loans [Member] | Mong Duong Subsidiary [Member] |
Debt Instrument [Line Items] |
Issued new debt | 272,000,000
Construction Loans [Member] | Cochrane Subsidiary [Member] |
Debt Instrument [Line Items] |
Issued new debt | $ 125,000,000

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration