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Pension Plans (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
U.S.
 
Foreign
 
U.S.
 
Foreign
 
U.S.
 
Foreign
 
U.S.
 
Foreign
Service cost
$
3

 
$
4

 
$
3

 
$
3

 
$
10

 
$
11

 
$
9

 
$
9

Interest cost
10

 
99

 
10

 
92

 
31

 
296

 
30

 
255

Expected return on plan assets
(17
)
 
(73
)
 
(17
)
 
(59
)
 
(52
)
 
(219
)
 
(50
)
 
(164
)
Amortization of prior service cost
1

 
—

 
2

 
—

 
4

 
—

 
6

 
—

Amortization of net loss
5

 
10

 
5

 
5

 
14

 
31

 
14

 
14

Curtailment loss recognized
—

 
—

 
—

 
—

 
4

 
—

 
—

 
—

Total pension cost
$
2

 
$
40

 
$
3

 
$
41

 
$
11

 
$
119

 
$
9

 
$
114

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended 
 September 30, 2017
 
Remainder of 2017 (Expected)
 
 
 
 
 
 
 
 
 
U.S.
 
Foreign
 
U.S.
 
Foreign
Total employer contributions
 
 
 
 
 
 
 
 
$
14

 
$
118

 
$
—

 
$
41