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Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost and other amounts recognized in other comprehensive income
The following table provides the components of net periodic benefit cost for our defined benefit pension plans, disaggregated by domestic and international plans.
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(in millions)
2015
 
2014
 
2015
 
2014
Domestic defined benefit pension plans:
 
 
 
 
 
 
 
Service cost
$
1

 
$
1

 
$
2

 
$
2

Interest cost
1

 
—

 
3

 
2

Expected return on plan assets
(2
)
 
(1
)
 
(4
)
 
(3
)
Amortization of net actuarial loss
1

 
—

 
2

 
1

Net periodic benefit cost
$
1

 
$
—

 
$
3

 
$
2

International defined benefit pension plans:
 
 
 
 
 
 
 
Service cost
$
3

 
$
3

 
$
9

 
$
11

Interest cost
6

 
8

 
18

 
22

Expected return on plan assets
(8
)
 
(8
)
 
(25
)
 
(25
)
Amortization of net actuarial loss
3

 
2

 
10

 
6

Net periodic benefit cost
$
4

 
$
5

 
$
12

 
$
14

Total net periodic benefit cost
$
5

 
$
5

 
$
15

 
$
16