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Debt - Non-Recourse Debt Narrative (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |
Debt defaults at risk of causing cross default | 0 |
Gain (loss) on extinguishment of debt | $ 4 | $ (23)
Proceeds from Lines of Credit | 248 | $ 101
Parent Company [Member] |  |
Debt Instrument [Line Items] |  |
Gain (loss) on extinguishment of debt | 7 |
Nonrecourse Debt [Member] |  |
Debt Instrument [Line Items] |  |
Gain (loss) on extinguishment of debt | (2) |
Issued new debt | 309 |
Repayments of Debt | 342 |
Nonrecourse Debt [Member] | IPALCO Enterprises, Inc. [Member] |  |
Debt Instrument [Line Items] |  |
Gain (loss) on extinguishment of debt | 0 |
Issued new debt | 148 |
Repayments of Debt | 83 |
Nonrecourse Debt [Member] | Other Subsidiaries [Member] |  |
Debt Instrument [Line Items] |  |
Gain (loss) on extinguishment of debt | (2) |
Issued new debt | 161 |
Repayments of Debt | $ 259 |

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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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