Equity (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Class of Stock [Line Items]
Ownership percentage by parent	82.35%
Equity contributions from AES		$ 253,000	$ 275,000
Equity contributions from shareholders	$ 0	253,000	275,000
Debt to Capitalization Ratio, Maximum	1
Interest Coverage Ratio	2.50
Interest Coverage Ratio, Minimum	1
Leverage Ratio	0.67
Payments of Ordinary Dividends, Common Stock	$ 104,287	101,986	131,476
Number of separate series of cumulative preferred stock	5
Total preferred stock dividends declared	$ 0	3,213
Equity Capital Contributions	208,300		226,500
Preferred Stock Redemption Premium	300
Limited Partners' Contributed Capital	79,300
$200M Term Loan Maturing June 2023
Class of Stock [Line Items]
Short-Term Bank Loans and Notes Payable	200,000
Indianapolis Power And Light Company
Class of Stock [Line Items]
Equity contributions from AES	$ 0	253,000	275,000
Debt to capitalization ratio	0.67
Debt to Capitalization Ratio, Maximum	1
Dividends, Common Stock, Cash	$ 140,200	127,200	155,700
Payments of Ordinary Dividends, Common Stock	$ 140,200	127,200	155,700
Number of separate series of cumulative preferred stock	5
Total preferred stock dividends declared	$ 3,200
Preferred Stock, Voting Rights	2
Equity Capital Contributions	$ 253,000	275,000
Preferred Stock, Redemption Amount		60,100
Dividends, Preferred Stock, Stock	0	3,200	3,200
Indianapolis Power And Light Company | $200M Term Loan Maturing June 2023
Class of Stock [Line Items]
Short-Term Bank Loans and Notes Payable	200,000
AES U.S. Investments [Member]
Class of Stock [Line Items]
Equity Capital Contributions	$ 208,300		226,500
AES U.S. Holdings, LLC [Member]
Class of Stock [Line Items]
Ownership Interest in Parent Company, Percent	85.00%
CDPQ [Member]
Class of Stock [Line Items]
Ownership Interest in Parent Company, Percent	15.00%
Equity Capital Contributions	$ 31,300		34,000
Equity Capital Contribution to IPALCO	44,700		48,500
AES US Holdings LLC
Class of Stock [Line Items]
Equity Capital Contributions	$ 177,000		192,500
Minimum [Member]
Class of Stock [Line Items]
Dividend rate on preferred stock	4.00%
Minimum [Member] | Indianapolis Power And Light Company
Class of Stock [Line Items]
Dividend rate on preferred stock	4.00%
Maximum [Member]
Class of Stock [Line Items]
Dividend rate on preferred stock	5.65%
Maximum [Member] | Indianapolis Power And Light Company
Class of Stock [Line Items]
Dividend rate on preferred stock	5.65%
Additional Paid-in Capital [Member]
Class of Stock [Line Items]
Equity contributions from AES		253,000	275,000
Equity contributions from shareholders
Additional Paid-in Capital [Member] | Indianapolis Power And Light Company
Class of Stock [Line Items]
Equity contributions from AES	0	253,000	275,000
Retained Earnings [Member] | Indianapolis Power And Light Company
Class of Stock [Line Items]
Dividends, Common Stock, Cash	$ 140,200	127,200	155,700
Total preferred stock dividends declared		$ 3,213	$ 3,213