PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Net Periodic Benefit Cost for All Significant Plans

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						Nine Months Ended
In millions	Sep 30, 2019			Sep 30, 2018			Sep 30, 2019			Sep 30, 2018
Defined Benefit Pension Plans:
Service cost	$	9		$	10		$	27		$	30
Interest cost	36			32			108			96
Expected return on plan assets	(52		)	(55		)	(158		)	(164		)
Amortization of net loss	20			24			62			71
Net periodic benefit cost	$	13		$	11		$	39		$	33
Other Postretirement Benefits:
Interest cost	$	2		$	2		$	6		$	5
Amortization of net gain	(2		)	(3		)	(6		)	(7		)
Net periodic benefit cost	$	—		$	(1	)	$	—		$	(2	)