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Consolidation and Presentation (Tables)
 6 Months Ended
Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Redeemable Noncontrolling Interest
The following is a rollforward of activities in our redeemable noncontrolling interests for the six months ended June 30, 2017 and 2016, respectively:
 
Six Months Ended June 30,
 
2017
 
2016
 
(Millions)
Balance January 1
$
40

 
$
42

Net income attributable to redeemable noncontrolling interests
19

 
18

Other comprehensive loss
1

 
(1
)
Dividends declared
(35
)
 
(33
)
Balance June 30
$
25

 
$
26