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Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Temporary Equity [Line Items]      
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 890   $ 879
Colon [Domain]      
Temporary Equity [Line Items]      
Temporary Equity, Other Charges 10 $ 10  
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount [1] 212   201
IPALCO Enterprises, Inc. [Member]      
Temporary Equity [Line Items]      
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount 618   618
IPL Subsidiary [Member]      
Temporary Equity [Line Items]      
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount $ 60   $ 60
[1] (1) Characteristics of quotas are similar to common stock.