Defined Benefit Pension and Other Postretirement Plans (Tables)

6 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Components of Net Periodic Pension Expense and Other Postretirement Benefit Costs

Net periodic pension cost includes the following components:

	Pension Benefits
Three Months Ended March 31,	2021		2020
Service cost	$	3	$	3
Interest cost	6		6
Expected return on assets	(10)		(9)
Curtailment gain	—		(1)
Amortization of:
Actuarial loss	3		3
Net cost	$	2	$	2
Six Months Ended March 31,	2021		2020
Service cost	$	6	$	6
Interest cost	11		12
Expected return on assets	(20)		(19)
Curtailment gain	—		(1)
Amortization of:
Actuarial loss	7		7
Net cost	$	4	$	5