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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
 3 Months Ended
Mar. 31, 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
In millions
Mar 31,
2018
Mar 31,
2017
Defined Benefit Pension Plans:
 
 
Service cost
$
133

$
125

Interest cost
218

219

Expected return on plan assets
(406
)
(383
)
Amortization of prior service credit
(6
)
(6
)
Amortization of net loss
171

157

Net periodic benefit cost
$
110

$
112

 
 
 
Other Postretirement Benefits:
 
 
Service cost
$
3

$
3

Interest cost
11

14

Amortization of net gain
(6
)
(2
)
Net periodic benefit cost
$
8

$
15



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, 2 and 5 for additional information.