Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Pension and Other Postretirement Benefit Costs

Pension and other postretirement benefit costs for the three months ended March 31, 2019 and 2018 were as follows:

	Three Months Ended
	March 31,
	Pension						Other Postretirement Benefits
In millions	2019			2018			2019			2018
Components of net periodic benefit cost:
Service cost	$	13		$	15		$	2		$	2
Interest cost	20			18			5			5
Expected return on plan assets	(30		)	(32		)	(6		)	(6		)
Amortization of actuarial loss (gain)	5			11			—			(1		)
Total net periodic benefit cost	$	8		$	12		$	1		$	—