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Consolidation and Presentation (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2018 and 2017, respectively:
 
Six Months Ended June 30,
 
2018
 
2017
 
(Millions)
Balance January 1
$
42

 
$
40

Net income attributable to redeemable noncontrolling interests
16

 
19

Other comprehensive (loss) income
(1
)
 
1

Dividends declared
(19
)
 
(35
)
Balance June 30
$
38

 
$
25