Benefit Plans (Schedule Of Defined Benefit Plans Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in benefit obligation:
Projected benefit obligation at beginning Measurement Date (see below)	$ 842,525	$ 782,795
Service cost	9,339	8,272	$ 7,412
Interest cost	15,660	22,151	27,343
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(37,858)	66,827
Amendments (primarily increases in pension bands)	5,575	967
Benefits paid	(63,201)	(38,487)
Projected benefit obligation at ending Measurement Date	772,040	842,525	782,795
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	850,020	769,704
Actual return on plan assets	33,841	118,716
Employer contributions during quarter	24	87	0
Benefits paid	(63,201)	(38,487)
Defined Benefit Plan Fair Value of plan assets	820,684	850,020
Fair value of plan assets at ending Measurement Date	820,684	850,020	769,704
Unfunded status	48,644	7,495
Asset, Defined Benefit Pension Plan, Noncurrent	(49,182)	(8,669)
Amounts recognized in the statement of financial position under ASC 715:
Noncurrent liabilities	(538)	(1,174)
Asset, Defined Benefit Plan, Noncurrent, Net	48,644	7,495
Sources of change in regulatory assets(1):
Prior service cost (credit) arising during period	5,575	967
Net loss (gain) arising during period	(29,884)	(14,110)
Amortization of prior service cost	(2,944)	(3,677)
Amortization of gain (loss)	(5,529)	(8,115)
Total recognized in regulatory assets	(32,782)	(24,935)
Net loss (gain)	110,113	145,526
Prior service cost (credit)	14,244	11,613
Total amounts included in regulatory assets (liabilities)	$ 124,357	$ 157,139
Percentage by asset category	100.00%	100.00%
Assets for Plan Benefits, Defined Benefit Plan	$ 49,182	$ 8,669
Fair Value, Inputs, Level 1 [Member]
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	6,769
Fair value of plan assets at ending Measurement Date	7,229	6,769
Significant Observable Inputs (Level 2) [Member]
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	843,251
Fair value of plan assets at ending Measurement Date	813,592	843,251
Indianapolis Power And Light Company
Change in benefit obligation:
Projected benefit obligation at beginning Measurement Date (see below)	842,525	782,795
Service cost	9,339	8,272	7,412
Interest cost	15,660	22,151	27,343
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(37,858)	66,827
Amendments (primarily increases in pension bands)	5,575	967
Benefits paid	(63,201)	(38,487)
Projected benefit obligation at ending Measurement Date	772,040	842,525	782,795
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	850,020	769,704
Actual return on plan assets	33,841	118,716
Employer contributions during quarter	24	87	0
Benefits paid	(63,201)	(38,487)
Fair value of plan assets at ending Measurement Date	820,684	850,020	$ 769,704
Unfunded status	48,644	7,495
Asset, Defined Benefit Pension Plan, Noncurrent	(49,182)	(8,669)
Amounts recognized in the statement of financial position under ASC 715:
Noncurrent liabilities	(538)	(1,174)
Asset, Defined Benefit Plan, Noncurrent, Net	48,644	7,495
Sources of change in regulatory assets(1):
Prior service cost (credit) arising during period	5,575	967
Net loss (gain) arising during period	(29,884)	(14,110)
Amortization of prior service cost	(2,944)	(3,677)
Amortization of gain (loss)	(5,529)	(8,115)
Total recognized in regulatory assets	(32,782)	(24,935)
Net loss (gain)	110,113	145,526
Prior service cost (credit)	14,244	11,613
Total amounts included in regulatory assets (liabilities)	$ 124,357	$ 157,139
Percentage by asset category	100.00%	100.00%
Assets for Plan Benefits, Defined Benefit Plan	$ 49,182	$ 8,669
Indianapolis Power And Light Company | Fair Value, Inputs, Level 1 [Member]
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	6,769
Fair value of plan assets at ending Measurement Date	7,229	6,769
Indianapolis Power And Light Company | Significant Observable Inputs (Level 2) [Member]
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	843,251
Fair value of plan assets at ending Measurement Date	813,592	843,251
US Government Debt Securities [Member]
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	118,255
Fair value of plan assets at ending Measurement Date	$ 154,051	$ 118,255
Sources of change in regulatory assets(1):
Percentage by asset category	19.00%	14.00%
US Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	$ 131
Fair value of plan assets at ending Measurement Date	324	$ 131
US Government Debt Securities [Member] | Significant Observable Inputs (Level 2) [Member]
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	118,124
Fair value of plan assets at ending Measurement Date	153,727	118,124
US Government Debt Securities [Member] | Indianapolis Power And Light Company
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	118,255
Fair value of plan assets at ending Measurement Date	$ 154,051	$ 118,255
Sources of change in regulatory assets(1):
Percentage by asset category	19.00%	14.00%
US Government Debt Securities [Member] | Indianapolis Power And Light Company | Fair Value, Inputs, Level 1 [Member]
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	$ 131
Fair value of plan assets at ending Measurement Date	324	$ 131
US Government Debt Securities [Member] | Indianapolis Power And Light Company | Significant Observable Inputs (Level 2) [Member]
Change in plan assets:
Fair value of plan assets at beginning Measurement Date	118,124
Fair value of plan assets at ending Measurement Date	$ 153,727	$ 118,124