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Pension and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Pension and Other Postretirement Benefits

Pension and other postretirement benefit costs for the three and nine months ended September 30, 2019 and 2018 were as follows:

 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
Pension
 
Other Postretirement Benefits
 
Pension
 
Other Postretirement Benefits
In millions
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
13

 
$
15

 
$
1

 
$
2

 
$
39

 
$
45

 
$
5

 
$
6

Interest cost
20

 
18

 
5

 
4

 
59

 
54

 
15

 
13

Expected return on plan assets
(30
)
 
(31
)
 
(5
)
 
(6
)
 
(91
)
 
(95
)
 
(16
)
 
(18
)
Amortization of actuarial loss (gain)
5

 
11

 
—

 
(1
)
 
16

 
33

 
(1
)
 
(2
)
Amortization of prior service cost
—

 
—

 
—

 
—

 
1

 
—

 
—

 
—

Total net periodic benefit cost
$
8

 
$
13

 
$
1

 
$
(1
)
 
$
24

 
$
37

 
$
3

 
$
(1
)


The service cost component of net periodic benefit cost is presented within Cost of revenue and Selling, administrative, and research and development expenses in the statement of income while the other components of net periodic benefit cost are presented within Other income (expense).

The Company expects to contribute approximately $30 million to its pension plans and $5 million to its other postretirement benefit plans in 2019. As of September 30, 2019, contributions of $22 million to pension plans and $3 million to other postretirement benefit plans have been made.