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Consolidation and Presentation (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018 and 2017:
 
Nine Months Ended
September 30,
 
2018
 
2017
 
(Millions)
Balance January 1
$
42

 
$
40

Net income attributable to redeemable noncontrolling interests
22

 
27

Other comprehensive (loss) income
(3
)
 
2

Dividends declared
(33
)
 
(37
)
Balance September 30
$
28

 
$
32