Benefit Plans (Schedule Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9,339	$ 8,272	$ 7,412
Interest cost	15,660	22,151	27,343
Expected return on assets	(41,815)	(37,779)	(29,907)
Defined Benefit Plan Amortization of prior service cost net of acceleration component of curtailment charge	2,944	3,677	3,823
Amortization of actuarial loss	5,529	8,115	11,084
Net periodic benefit cost	(8,343)	4,436	19,755
Less: amounts capitalized	771	(372)	(1,237)
Amount charged to expense	$ (7,572)	4,064	$ 18,518
Expected return on plan assets	5.05%		5.05%
Asset, Defined Benefit Pension Plan, Noncurrent	$ 49,182	8,669
Indianapolis Power And Light Company
Defined Benefit Plan Disclosure [Line Items]
Service cost	9,339	8,272	$ 7,412
Interest cost	15,660	22,151	27,343
Expected return on assets	(41,815)	(37,779)	(29,907)
Defined Benefit Plan Amortization of prior service cost net of acceleration component of curtailment charge	2,944	3,677	3,823
Amortization of actuarial loss	5,529	8,115	11,084
Net periodic benefit cost	(8,343)	4,436	19,755
Less: amounts capitalized	771	(372)	(1,237)
Amount charged to expense	(7,572)	4,064	$ 18,518
Expected return on plan assets			5.05%
Asset, Defined Benefit Pension Plan, Noncurrent	$ 49,182	$ 8,669
Pension Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.46%	3.33%	4.36%
Expected return on plan assets	5.05%	5.05%	4.50%
Pension Benefit [Member] | Indianapolis Power And Light Company
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.46%	3.33%	4.36%
Expected return on plan assets	5.05%	5.05%	4.50%
Supplemental Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.31%	3.05%	4.24%
Expected return on plan assets	3.60%	4.45%	4.50%
Supplemental Retirement Plan [Member] | Indianapolis Power And Light Company
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.31%	3.05%	4.24%
Expected return on plan assets	3.60%	4.45%	4.50%