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Postretirement Benefit Plans
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Postretirement Benefit Plans Postretirement Benefit Plans
The components of net periodic benefit cost for our defined benefit pension plans are as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(in millions)
2016
 
2015
 
2016
 
2015
Domestic defined benefit pension plans:
 
 
 
 
 
 
 
Service cost
$
1

 
$
1

 
$
2

 
$
2

Interest cost
1

 
1

 
3

 
3

Expected return on plan assets
(2
)
 
(2
)
 
(4
)
 
(4
)
Amortization of net actuarial loss
1

 
1

 
2

 
2

Net periodic benefit cost
$
1

 
$
1

 
$
3

 
$
3

International defined benefit pension plans:
 
 
 
 
 
 
 
Service cost
$
3

 
$
3

 
$
8

 
$
9

Interest cost
6

 
6

 
18

 
18

Expected return on plan assets
(8
)
 
(8
)
 
(25
)
 
(25
)
Amortization of net actuarial loss
2

 
3

 
6

 
10

Net periodic benefit cost
$
3

 
$
4

 
$
7

 
$
12

Total net periodic benefit cost
$
4

 
$
5

 
$
10

 
$
15


The total net periodic benefit cost for other postretirement employee benefit plans was less than $1 million and $2 million including amounts recognized in other comprehensive income ("OCI") of less than $1 million for both the three and nine months ended September 30, 2016, respectively. The total net periodic benefit cost for other postretirement employee benefit plans was $1 million and $3 million including amounts recognized in OCI of less than $1 million for both the three and nine months ended September 30, 2015, respectively.
We contributed $22 million and $21 million to our defined benefit plans during the nine months ended September 30, 2016 and 2015, respectively. Additional contributions ranging between approximately $6 million and $10 million are expected during the remainder of 2016.