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Redeemable Noncontrolling Interest (Tables)
 6 Months Ended
Jun. 30, 2017
Noncontrolling Interest [Abstract]  
Summary of the redeemable noncontrolling interest activity
The following table presents a summary of the redeemable noncontrolling interest activity during the six months ended June 30, 2017 and 2016:
(in millions)
 
2017
 
2016
Balance as of January 1,
 
$
73

 
$
77

Distributions
 
(16
)
 
(16
)
Share of income
 
16

 
17

Adjustment to redemption value of redeemable noncontrolling interest
 
(1
)
 
(4
)
Balance as of June 30,
 
$
72

 
$
74