Overview and Summary of Significant Accounting Policies Accounting Policies (Tables)	12 Months Ended
Dec. 31, 2017
Entity Information [Line Items]
Schedule of Expected Service and Interest Costs
Indianapolis Power And Light Company [Member]
Entity Information [Line Items]
Schedule of Expected Service and Interest Costs

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.

No definition available.

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