Employee Benefit Plans (Tables)

9 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Components of Pension and Other Postretirement Benefit Income

The following table summarizes the components of pension and other postretirement benefit income:

					Other postretirement benefits
	Pension benefits
(In millions)	2021		2020		2021		2020
Three months ended June 30
Service cost	$	1	$	1	$	—	$	—
Interest cost	10		15		1		—
Expected return on plan assets	(22)		(21)		—		—
Amortization of prior service credit	—		—		(3)		(3)
Net periodic benefit income	$	(11)	$	(5)	$	(2)	$	(3)
Nine months ended June 30
Service cost	$	2	$	2	$	—	$	—
Interest cost	32		46		1		1
Expected return on plan assets	(65)		(65)		—		—
Amortization of prior service credit	—		—		(9)		(9)
Net periodic benefit income	$	(31)	$	(17)	$	(8)	$	(8)