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Consolidation and Presentation (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2018 and 2017, respectively:
 
Three Months Ended March 31,
 
2018
 
2017
 
(Millions)
Balance January 1
$
42

 
$
40

Net income attributable to redeemable noncontrolling interests
7

 
8

Other comprehensive loss
1

 
—

Balance March 31
$
50

 
$
48