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Consolidation and Presentation (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2017 and 2016, respectively:
 
Nine Months Ended September 30,
 
2017
 
2016
 
(Millions)
Balance January 1
$
40

 
$
41

Net income attributable to redeemable noncontrolling interests
27

 
27

Other comprehensive loss
2

 
(1
)
Dividends declared
(37
)
 
(35
)
Balance September 30
$
32

 
$
32