v3.25.2
Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cash equivalents $ 303   $ 303   $ 52
Cash equivalents weighted-average interest rate, percentage 4.00%   4.00%    
Steam Plant [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Asset retirement obligation charge for IPL's steam assets   $ 20   $ 20  
IPL [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cash equivalents $ 194   $ 194   $ 9
Cash equivalents weighted-average interest rate, percentage 4.00%   4.00%    
Asset retirement obligation charge for IPL's steam assets $ 84 102 $ 169 187  
IPL [Member] | Steam Plant [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Asset retirement obligation charge for IPL's steam assets   $ 20   $ 20