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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
The following table provides the components of the Company's net periodic benefit cost for all significant plans:

Net Periodic Benefit Cost for All Significant Plans
Three Months Ended
Six Months Ended
In millions
Jun 30,
2018
Jun 30,
2017
Jun 30,
2018
Jun 30,
2017
Defined Benefit Pension Plans:
 
 
 
 
Service cost
$
132

$
126

$
265

$
251

Interest cost
217

220

435

439

Expected return on plan assets
(404
)
(385
)
(810
)
(768
)
Amortization of prior service credit
(6
)
(6
)
(12
)
(12
)
Amortization of net loss
170

158

341

315

Curtailment/settlement 1
—

(6
)
—

(6
)
Net periodic benefit cost
$
109

$
107

$
219

$
219

 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
Service cost
$
3

$
3

$
6

$
6

Interest cost
11

13

22

27

Amortization of net gain
(6
)
(1
)
(12
)
(3
)
Net periodic benefit cost
$
8

$
15

$
16

$
30


1. The 2017 impact relates to the curtailment and settlement of a pension plan in Korea.

On January 1, 2018, the Company 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, is retrospectively included in "Sundry income (expense) - net" in the consolidated statements of income. See Notes 1 and 2 for additional information.