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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Costs
Pension and other postretirement benefit costs for the three and six months ended June 30, 2017 and 2016 were as follows:

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
Pension
 
Other Postretirement Benefits
 
Pension
 
Other Postretirement Benefits
In millions
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
16

 
$
16

 
$
2

 
$
3

 
$
32

 
$
32

 
$
4

 
$
5

Interest cost
18

 
24

 
5

 
6

 
36

 
47

 
10

 
12

Expected return on plan assets
(33
)
 
(36
)
 
(5
)
 
(5
)
 
(66
)
 
(73
)
 
(11
)
 
(11
)
Amortization of actuarial loss
14

 
10

 
(1
)
 
—

 
28

 
21

 
(1
)
 
—

Amortization of prior service income
—

 
—

 
—

 
(1
)
 
—

 
—

 
—

 
(1
)
Total net periodic benefit cost
$
15

 
$
14

 
$
1

 
$
3

 
$
30

 
$
27

 
$
2

 
$
5