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Redeemable Stock of Subsidiaries Redeemable Stock of Subsidiaries (Tables)
 12 Months Ended
Dec. 31, 2018
Temporary Equity Disclosure [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block] The following table summarizes the Company's redeemable stock of subsidiaries balances as of the periods indicated (in millions):
December 31,
2018
 
2017
IPALCO common stock
$
618

 
$
618

Colon quotas (1)
201

 
159

IPL preferred stock
60

 
60

Total redeemable stock of subsidiaries
$
879

 
$
837


 _____________________________
(1) 
Characteristics of quotas are similar to common stock.The following table is a reconciliation of changes in redeemable stock of subsidiaries (in millions):
December 31,
2018
 
2017
Balance at the beginning of the period
$
837

 
$
782

Contributions from holders of redeemable stock of subsidiaries
34

 
50

Net income (loss) attributable to redeemable stock of subsidiaries
2

 
(14
)
Fair value adjustment 
4

 
25

Other comprehensive income (loss) attributable to redeemable stock of subsidiaries
2

 
(2
)
Acquisition and reclassification of stock of subsidiaries
—

 
(4
)
Balance at the end of the period
$
879

 
$
837