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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
A summary of the Corporation's pension plans and other postretirement benefits can be found in Note 16 to the Consolidated Financial Statements included in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2017. The following table provides the components of the Corporation's net periodic benefit cost for all significant plans:

Net Periodic Benefit Cost (Credit) for All Significant Plans
Three Months Ended
Nine Months Ended
In millions
Sep 30,
2018
Sep 30,
2017
Sep 30,
2018
Sep 30,
2017
Defined Benefit Pension Plans:
 
 
 
 
Service cost
$
10

$
10

$
30

$
28

Interest cost
32

33

96

97

Expected return on plan assets
(55
)
(56
)
(164
)
(166
)
Amortization of net loss
24

20

71

62

Net periodic benefit cost
$
11

$
7

$
33

$
21

 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
Interest cost
$
2

$
2

$
5

$
6

Amortization of net gain
(3
)
(2
)
(7
)
(4
)
Net periodic benefit cost (credit)
$
(1
)
$
—

$
(2
)
$
2



On January 1, 2018, the Corporation adopted ASU 2017-07, which impacted the presentation of the components of net periodic benefit cost in the consolidated statements of income. Net periodic benefit cost, other than the service cost component, was retrospectively reclassified to "Sundry income (expense) - net" in the consolidated statements of income. See Notes 1 and 2 for additional information.