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Debt - Non-Recourse Debt Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |
Debt defaults at risk of causing cross default | 0 |  | 0 |
Loss on extinguishment of debt | $ 20 | $ 47 | $ 165 | $ 196
Proceeds from Lines of Credit |  |  | 677 | $ 758
Nonrecourse Debt [Member] | Gener Subsidiary [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issued new debt | 575 |  | 575 |
Nonrecourse Debt [Member] | Sul Subsidiary [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt |  |  | 4 |
Issued new debt | 499 |  | 499 |
Repayments of Debt |  |  | 470 |
Nonrecourse Debt [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt |  |  | 22 |
Issued new debt | 665 |  | 665 |
Repayments of Debt |  |  | 420 |
Nonrecourse Debt [Member] | PANAMA |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt |  |  | 15 |
Issued new debt | 300 |  | 300 |
Repayments of Debt |  |  | 287 |
Nonrecourse Debt [Member] | Cochrane Subsidiary [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from Lines of Credit |  |  | 308 |
Nonrecourse Debt [Member] | Ventanas [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt |  |  | 6 |
Repayments of Debt |  |  | 308 |
Nonrecourse Debt [Member] | Eletropaulo [Domain] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issued new debt | 268 |  | 268 |
Repayments of Debt |  |  | 121 |
Nonrecourse Debt [Member] | Mong Duong Subsidiary [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from Lines of Credit |  |  | 203 |
Nonrecourse Debt [Member] | DPL Subsidiary [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt |  |  | 2 |
Issued new debt | $ 325 |  | 325 |
Repayments of Debt |  |  | $ 474 |

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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 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: 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 + 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 FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 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=56944662&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 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: 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=26873400&loc=d3e23780-122690 + Details
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