Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Pension and Other Postretirement Benefit Costs

Pension and other postretirement benefit costs for the three and six months ended June 30, 2020 and 2019 were as follows:

	Three Months Ended								Six Months Ended
	June 30,								June 30,
	Pension				Other Postretirement Benefits				Pension				Other Postretirement Benefits
In millions	2020		2019		2020		2019		2020		2019		2020		2019
Components of net periodic benefit cost:
Service cost	$	13	$	13	$	2	$	2	$	27	$	26	$	4	$	4
Interest cost	15		19		4		5		30		39		8		10
Expected return on plan assets	(28)		(31)		(6)		(5)		(56)		(61)		(12)		(11)
Amortization of actuarial loss (gain)	12		6		—		(1)		24		11		—		(1)
Amortization of prior service cost	—		1		—		—		—		1		—		—
Total net periodic benefit cost	$	12	$	8	$	—	$	1	$	25	$	16	$	—	$	2