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Pension Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost Table
Total pension cost and employer contributions were as follows for the periods indicated (in millions):
 
Three Months Ended March 31,
 
2018
 
2017
 
U.S.
 
Foreign
 
U.S.
 
Foreign
Service cost
$
4

 
$
3

 
$
3

 
$
3

Interest cost
10

 
5

 
10

 
5

Expected return on plan assets
(16
)
 
(5
)
 
(17
)
 
(5
)
Amortization of prior service cost
1

 
—

 
1

 
—

Amortization of net loss
5

 
1

 
5

 
—

Curtailment loss recognized
1

 
2

 
4

 
—

Total pension cost
$
5

 
$
6

 
$
6

 
$
3

 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2018
 
Remainder of 2018 (Expected)
 
U.S.
 
Foreign
 
U.S.
 
Foreign
Total employer contributions
$
38

 
$
3

 
$
—

 
$
9