Benefit Plans (Tables)

9 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Net Pension and Postretirement Cost

Net pension cost included the following components for the three and nine months ended June 30:

	Three Months Ended June 30,				Nine Months Ended June 30,
(Millions of dollars)	2020		2019		2020		2019
Service cost	$	37	$	33	$	116	$	101
Interest cost	21		26		64		80
Expected return on plan assets	(46)		(44)		(143)		(135)
Amortization of prior service credit	(3)		(3)		(10)		(10)
Amortization of loss	24		19		74		58
Settlements	2		—		2		—
Net pension cost	$	35	$	30	$	103	$	93