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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Costs
Pension and other postretirement benefit costs for the three and six months ended June 30, 2018 and 2017 were as follows:

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
Pension
 
Other Postretirement Benefits
 
Pension
 
Other Postretirement Benefits
In millions
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
15

 
$
16

 
$
2

 
$
2

 
$
30

 
$
32

 
$
4

 
$
4

Interest cost
18

 
18

 
4

 
5

 
36

 
36

 
9

 
10

Expected return on plan assets
(32
)
 
(33
)
 
(6
)
 
(5
)
 
(64
)
 
(66
)
 
(12
)
 
(11
)
Amortization of actuarial loss (gain)
11

 
14

 
—

 
(1
)
 
22

 
28

 
(1
)
 
(1
)
Total net periodic benefit cost
$
12

 
$
15

 
$
—

 
$
1

 
$
24

 
$
30

 
$
—

 
$
2