Benefit Plans (Tables)

3 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Net Pension and Postretirement Cost

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

	Three Months Ended December 31,
(Millions of dollars)	2020		2019
Service cost	$	43	$	40
Interest cost	20		22
Expected return on plan assets	(48)		(49)
Amortization of prior service credit	(4)		(3)
Amortization of loss	27		25
Net pension cost	$	38	$	35