XML 91 R75.htm IDEA: XBRL DOCUMENT v3.8.0.1
Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Temporary Equity [Line Items]      
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests $ 851   $ 837
Temporary Equity, Net Income 5 $ 3  
Noncontrolling Interest, Increase from Sale of Parent Equity Interest 1 18  
Colon [Domain]      
Temporary Equity [Line Items]      
Temporary Equity, Other Charges 10 $ 0  
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests [1] 173   159
IPALCO Enterprises, Inc. [Member]      
Temporary Equity [Line Items]      
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests 618   618
IPL Subsidiary [Member]      
Temporary Equity [Line Items]      
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests $ 60   $ 60
[1] (1) Characteristics of quotas are similar to common stock.