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Redeemable Noncontrolling Interest (Tables)
 6 Months Ended
Jun. 30, 2016
Noncontrolling Interest [Abstract]  
Summary of the redeemable noncontrolling interest activity
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