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Redeemable Stock of Subsidiaries Redeemable Stock of Subsidiaries (Tables)
 12 Months Ended
Dec. 31, 2017
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,
2017
 
2016
IPALCO common stock
$
618

 
$
618

Colon quotas (1)
159

 
100

IPL preferred stock
60

 
60

Other common stock
—

 
4

Total redeemable stock of subsidiaries
$
837

 
$
782


 _____________________________
(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,
2017
 
2016
Balance at the beginning of the period
$
782

 
$
538

Sale of redeemable stock of subsidiaries
—

 
134

Contributions from holders of redeemable stock of subsidiaries
50

 
130

Net loss attributable to redeemable stock of subsidiaries
(14
)
 
(11
)
Fair value adjustment (1)
25

 
4

Other comprehensive income (loss) attributable to redeemable stock of subsidiaries
(2
)
 
6

Acquisition and reclassification of stock of subsidiaries
(4
)
 
(19
)
Balance at the end of the period
$
837

 
$
782

 _____________________________
(1) 
$5 million increase in fair value of DP&L preferred shares offset by $1 million decrease in fair value of Colon common stock in 2016.