Benefit Plans (Tables)

6 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Net Pension and Postretirement Cost

Net pension cost included the following components for the three and six-month periods:

	Three Months Ended March 31,				Six Months Ended March 31,
(Millions of dollars)	2021		2020		2021		2020
Service cost	$	36	$	39	$	79	$	79
Interest cost	17		21		37		43
Expected return on plan assets	(41)		(48)		(89)		(97)
Amortization of prior service credit	(3)		(3)		(7)		(7)
Amortization of loss	23		25		50		50
Net pension cost	$	32	$	34	$	69	$	68