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Equity Equity Transactions with Noncontrolling Interests (Details) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 18, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Noncontrolling Interest [Line Items] |  |  |  |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest |  | $ (18,000,000) | $ (17,000,000) |
Additional Paid in Capital |  | $ 8,731,000,000 |  | $ 8,592,000,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 6.70% |  |
Stockholders' Equity Attributable to Parent |  | $ 2,991,000,000 |  | $ 2,794,000,000
Gain on disposal and sale of businesses |  | $ 0 | $ 47,000,000 |
Alto Maipo [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 40.00% |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 62.00% |  |
Additional Paid in Capital |  | $ 229,000,000 |  |
Stockholders' Equity Attributable to Parent |  | 196,000,000 |  |
Gain on disposal and sale of businesses |  | $ 0 |  |
IPALCO Enterprises, Inc. [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 30.00% |
IPP4 [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 36.00% |
Jordan [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold | 40.00% |  |  |
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds | $ 21,000,000 |  |  |
Gain on disposal and sale of businesses | $ 4,000,000 |  |  |
Additional Paid-in Capital [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest |  |  | $ (84,000,000) |
Mitsui Ltd [Member] | IPP4 [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 40.00% |
Nebras Power Q.S.C [Member] | IPP4 [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 24.00% |

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + 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(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + 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(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: 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(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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