Defined Benefit Pension and Other Postretirement Plans (Tables)

6 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Pension Benefit Cost (Income)

Net periodic pension benefit cost (income) includes the following components:

	Pension Benefits
Three Months Ended March 31,	2024		2023
Service cost	$	2	$	3
Interest cost	9		8
Expected return on assets	(11)		(12)
Amortization of:
Actuarial loss	1		—
Net benefit cost (income)	$	1	$	(1)
Six Months Ended March 31,	2024		2023
Service cost	$	4	$	5
Interest cost	18		17
Expected return on plan assets	(22)		(23)
Amortization of:
Actuarial loss (gain)	1		(1)
Net benefit cost (income)	$	1	$	(2)