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Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
U.S.
 
Foreign
 
U.S.
 
Foreign
 
U.S.
 
Foreign
 
U.S.
 
Foreign
Service cost
$
3

 
$
4

 
$
3

 
$
3

 
$
7

 
$
8

 
$
6

 
$
6

Interest cost
10

 
97

 
10

 
86

 
20

 
196

 
20

 
163

Expected return on plan assets
(17
)
 
(72
)
 
(16
)
 
(55
)
 
(35
)
 
(145
)
 
(33
)
 
(105
)
Amortization of prior service cost
1

 
—

 
2

 
—

 
3

 
—

 
4

 
—

Amortization of net loss
5

 
10

 
4

 
4

 
9

 
21

 
9

 
9

Curtailment loss recognized
—

 
—

 
—

 
—

 
4

 
—

 
—

 
—

Total pension cost
$
2

 
$
39

 
$
3

 
$
38

 
$
8

 
$
80

 
$
6

 
$
73

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended 
 June 30, 2017
 
Remainder of 2017 (Expected)
 
 
 
 
 
 
 
 
 
U.S.
 
Foreign
 
U.S.
 
Foreign
Total employer contributions
 
 
 
 
 
 
 
 
$
13

 
$
79

 
$
1

 
$
76