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 Corporation'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	$	10		$	9
Interest cost	32			32
Expected return on plan assets	(55		)	(55		)
Amortization of net loss	24			21
Net periodic benefit cost	$	11		$	7
Other Postretirement Benefits:
Interest cost	$	2		$	2
Amortization of net gain	(2		)	(1		)
Net periodic benefit cost	$	—		$	1

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, are included in "Sundry income (expense) - net" in the consolidated statements of income. See Notes 1 and 2 for additional information.