Benefit Plans (Schedule Of Asset Allocation Guidelines) (Details)	Dec. 31, 2017
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%
Equity Securities [Member] | Indianapolis Power And Light Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%
Debt Securities [Member] | Indianapolis Power And Light Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%