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Redeemable Stocks of Subsidiaries (Tables)
9 Months Ended
Sep. 30, 2018
Redeemable Stock of Subsidiaries [Abstract]  
Temporary Equity [Table Text Block] The following table summarizes the Company’s redeemable stock of subsidiaries balances as of the periods indicated (in millions):
 
September 30, 2018
 
December 31, 2017
IPALCO common stock
$
618

 
$
618

Colon quotas (1)
201

 
159

IPL preferred stock
60

 
60

Total redeemable stock of subsidiaries
$
879

 
$
837