Income Taxes (Schedule Of Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Entity Information [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	35.00%
State income tax, net of federal tax benefit	4.40%	5.60%	4.10%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Research and Development, Percent	0.00%	(1.90%)	0.00%
Depreciation flow through and amortization	(5.70%)	(15.60%)	(0.10%)
Effective Income Tax Rate Reconciliation, Funds Used during Construction, Equity	0.20%	0.30%	(4.10%)
Manufacturers' Production Deduction (Sec. 199)	0.00%	0.00%	(2.50%)
Other - net	1.30%	(0.30%)	(1.40%)
Effective tax rate	21.20%	9.10%	31.00%
Indianapolis Power And Light Company
Entity Information [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	35.00%
State income tax, net of federal tax benefit	4.40%	5.60%	4.00%
Amortization of investment tax credits	0.00%	(0.50%)	(0.70%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Research and Development, Percent	0.00%	(1.60%)	0.00%
Depreciation flow through and amortization	(4.70%)	(12.60%)	(0.10%)
Effective Income Tax Rate Reconciliation, Funds Used during Construction, Equity	0.20%	0.30%	(3.10%)
Manufacturers' Production Deduction (Sec. 199)	0.00%	0.00%	(2.40%)
Other - net	0.80%	(0.10%)	(0.20%)
Effective tax rate	21.70%	12.10%	32.50%