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Redeemable Noncontrolling Interest
 6 Months Ended
Jun. 30, 2016
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest
Redeemable Noncontrolling Interest
 
One of the Company's noncontrolling interests is redeemable at the option of the holder and is presented outside of equity and carried at its estimated redemption value.

The following table presents a summary of the redeemable noncontrolling interest activity during the periods presented:
(in millions)
 
2016
 
2015
Balance as of January 1,
 
$
77

 
$
70

Distributions
 
(16
)
 
(18
)
Share of income
 
17

 
18

Adjustment to redemption value of redeemable noncontrolling interest
 
(4
)
 
8

Balance as of June 30,
 
$
74

 
$
78