Benefit Plans (Schedule Of Expected Benefit Payments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Entity Information [Line Items]
2016	$ 37,997
2017	38,794
2018	39,665
2019	40,085
2020	41,477
2021 through 2025 (in total)	$ 200,574
Expected return on plan assets	5.60%
Pension Benefit [Member]
Entity Information [Line Items]
Expected return on plan assets	5.60%	4.45%	5.05%
Indianapolis Power And Light Company
Entity Information [Line Items]
2016	$ 37,997
2017	38,794
2018	39,665
2019	40,085
2020	41,477
2021 through 2025 (in total)	$ 200,574
Expected return on plan assets	5.60%	5.60%
Indianapolis Power And Light Company | Pension Benefit [Member]
Entity Information [Line Items]
Expected return on plan assets	5.60%	4.45%	5.05%