Debt Instrument, Ratio of Principal to Public Offering Price

No definition available.

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- Definition

Gain (Loss) on Early Extinguishment of Debt

+ References

No definition available.

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- Definition

Line of Credit Facility, Accordion Feature

+ References

No definition available.

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- Definition

Line of Credit Facility, Term

+ References

No definition available.

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- Definition

Maximum Authorized Amount Of Debt To Be Issued

+ References

No definition available.

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- Definition

Maximum Authorized Amount Of Debt To Be Refinanced

+ References

No definition available.

+ Details

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- Definition

Maximum Authorized Amount of Debt Remaining

+ References

No definition available.

+ Details

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- Definition

Net Earnings to Annual Interest Requirement Ratio

+ References

No definition available.

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- Definition

Number of Note Series

+ References

No definition available.

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- Definition

Preferred Stock Issuable in Lieu of Portion of Maximum Authorized Amount of Debt

+ References

No definition available.

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- Definition

Secured Debt Gross

+ References

No definition available.

+ Details

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- Definition

All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ 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.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

+ References

No definition available.

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Debt (Narrative) (Details)			1 Months Ended						12 Months Ended
Debt (Narrative) (Details)	Aug. 01, 2017 USD ($)	May 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2015 USD ($)	Oct. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	May 31, 2014 USD ($)	Dec. 31, 2017 USD ($) note_series	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 01, 2016 USD ($)	May 17, 2016 USD ($)
Debt Instrument [Line Items]
Secured debt gross									$ 2,508,800,000
Aggregate principal amount									2,656,800,000	$ 2,578,500,000
Net proceeds from debt issuance									404,633,000	387,662,000	$ 753,350,000
Gain (Loss) on Early Extinguishment of Debt									(8,875,000)	0	(21,956,000)
Line of credit facility, term								5 years
Ratio of principal to public offering price			99.901%
Long-term debt									2,477,538,000	2,499,490,000
Charges related to early extinguishment of debt									8,875,000	0	21,956,000
Maximum borrowing capacity								$ 250,000,000	500,000,000
Line of Credit Facility, Remaining Borrowing Capacity									250,000,000
Long-term Line of Credit										0
Maximum amount of short-term indebtedness outstanding									500,000,000
Authorized amount of debt to be issued									650,000,000
Authorized amount of debt to be refinanced									196,500,000
Maximum Authorized Amount of Debt Remaining									106,500,000
Preferred Stock Issuable in Lieu of Portion of Maximum Authorized Amount of Debt									65,000,000
Total fees paid to Purchasers									$ 400,000	400,000
Net Earnings to Annual Interest Requirement Ratio									2.5
Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, accordion feature								$ 150,000,000
Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Secured debt gross									$ 1,698,800,000
Aggregate principal amount									1,846,800,000	1,773,500,000
Net proceeds from debt issuance									0	387,662,000	348,638,000
Line of credit facility, term								5 years
Long-term debt									1,675,935,000	1,699,781,000
Maximum borrowing capacity								$ 250,000,000	500,000,000
Line of Credit Facility, Remaining Borrowing Capacity									250,000,000
Maximum amount of short-term indebtedness outstanding									500,000,000
Authorized amount of debt to be issued									650,000,000
Authorized amount of debt to be refinanced									196,500,000
Maximum Authorized Amount of Debt Remaining									106,500,000
Preferred Stock Issuable in Lieu of Portion of Maximum Authorized Amount of Debt									65,000,000
First mortgage bonds									$ 1,586,279,000	1,610,237,000
Net Earnings to Annual Interest Requirement Ratio									2.5
Indianapolis Power And Light Company [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, accordion feature								$ 150,000,000
Ipalco Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Net proceeds from debt issuance									$ 404,633,000	0	404,712,000
Early tender premium									(8,875,000)	0	(21,956,000)
Refunded aggregate principal			$ 400,000,000
Gain (Loss) on Early Extinguishment of Debt			$ 8,900,000
Long-term debt									801,603,000	799,709,000
Charges related to early extinguishment of debt									$ 8,875,000	0	$ 21,956,000
First Mortgage Bond 4.90% Due January 2016 [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate									4.90%
Refunded aggregate principal				$ 41,900,000
First Mortgage Bonds [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Secured debt gross									$ 1,608,800,000
First Mortgage Bonds Due January 2016 [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate									4.90%
Refunded aggregate principal				131,900,000
FMB Twenty [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Aggregate principal amount													$ 350,000,000
Debt instrument, stated interest rate		4.05%							4.05%
Proceeds from Issuance of Secured Debt		$ 343,600,000
Debt instrument, maturity date									May 01, 2046
First mortgage bonds									$ 350,000,000	350,000,000
Environmental Facilities Refunding Revenue Bonds, Series 2016A [Member] [Member]
Debt Instrument [Line Items]
Aggregate principal amount												$ 40,000,000.0
Debt instrument, stated interest rate												3.125%
Environmental Facilities Refunding Revenue Bonds, Series 2016A [Member] [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Aggregate principal amount												$ 40,000,000.0
Debt instrument, stated interest rate												3.125%
First Mortgage Bond Nine [Member]
Debt Instrument [Line Items]
Aggregate principal amount												$ 40,000,000.0
Debt instrument, stated interest rate												3.125%
First Mortgage Bond Nine [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Aggregate principal amount												$ 40,000,000.0
Debt instrument, stated interest rate									4.55%			3.125%
Debt instrument, maturity date									Dec. 01, 2024
First mortgage bonds									$ 40,000,000	40,000,000
Environmental Facilities Refunding Revenue Bonds, Series 2016B[Member] [Domain]
Debt Instrument [Line Items]
Refunded aggregate principal									$ 40,000,000
Debt Instrument, Redemption Price, Percentage									100.00%
Environmental Facilities Refunding Revenue Bonds, Series 2016B[Member] [Domain] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Refunded aggregate principal									$ 40,000,000
Debt Instrument, Redemption Price, Percentage									100.00%
First Mortgage Bond Five [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate									5.40%
Repayments of Secured Debt	$ 24,700,000
Debt instrument, maturity date									Aug. 01, 2017
First mortgage bonds									$ 0	24,650,000
Environmental Facilities Refunding Revenue Notes, Series 2015A [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date									Dec. 01, 2020
Environmental Facilities Refunding Revenue Notes, Series 2015B [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date									Dec. 01, 2020
3.45% Senior Secured Notes [Member] \| Ipalco Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate									3.45%
Ratio of principal to public offering price							99.929%
Proceeds from Issuance of Secured Debt							$ 399,500,000
Long-term debt									$ 405,000,000	405,000,000
Debt instrument, maturity date									Jul. 01, 2020
First Mortgage Bond 4.65% Due June 2043 [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Aggregate principal amount										170,000,000
Debt instrument, stated interest rate									4.65%
Debt instrument, maturity date									Jun. 01, 2043
First mortgage bonds									$ 170,000,000	170,000,000
First Mortgage Bond 4.70% Due September 2045 [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Aggregate principal amount						$ 260,000,000
Debt instrument, stated interest rate						4.70%			4.50%
Proceeds from Issuance of Secured Debt						$ 255,600,000
Debt instrument, maturity date									Jun. 01, 2044
First mortgage bonds									$ 130,000,000	130,000,000
7.25% Senior Secured Notes [Member] \| Ipalco Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate									7.25%
Refunded aggregate principal							366,500,000
Long-term debt							33,500,000
First Mortgage Bond Nineteen [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Aggregate principal amount		350,000,000
Debt instrument, stated interest rate									4.70%
Debt instrument, maturity date									Sep. 01, 2045
First mortgage bonds									$ 260,000,000	260,000,000
Accounts Receivable Securitization Program [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Refunded aggregate principal					$ 50,000,000
Three Point Seven Zero Percent Senior Secured Notes [Domain] \| Ipalco Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate									3.70%
Proceeds from Issuance of Secured Debt									$ 399,300,000
Long-term debt									$ 405,000,000	0
Debt instrument, maturity date									Sep. 01, 2024
First mortgage bonds									$ 405,000,000
Medium-term Notes [Member] \| Unsecured 364-day Taxable Term Loan [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 91,900,000			$ 91,900,000
Line of credit facility, term					364 days
Unsecured Debt [Member] \| Environmental Facilities Refunding Revenue Notes [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Aggregate principal amount									$ 90,000,000
Number of note series \| note_series									2
Unsecured Debt [Member] \| Environmental Facilities Refunding Revenue Notes, Series 2015A [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Aggregate principal amount									$ 30,000,000
Unsecured Debt [Member] \| Environmental Facilities Refunding Revenue Notes, Series 2015B [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Aggregate principal amount									60,000,000
Secured Debt [Member] \| First Mortgage Bond 4.90% Due January 2016 [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Refunded aggregate principal				30,000,000
Secured Debt [Member] \| First Mortgage Bond 4.90% Due January 2016 [Member] \| Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Refunded aggregate principal				$ 60,000,000
Line of Credit [Member] \| Committed Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Line of Credit									148,000,000	50,000,000
Line of Credit [Member] \| Indianapolis Power And Light Company [Member] \| Committed Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Line of Credit									$ 148,000,000	$ 50,000,000
Other Nonoperating Income (Expense) [Member] \| 7.25% Senior Secured Notes [Member] \| Ipalco Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Charges related to early extinguishment of debt							$ 22,100,000