Employee Benefit Plans (Tables)

9 Months Ended

Jun. 30, 2019

Retirement Benefits [Abstract]

Components of Pension and Other Postretirement Benefit Income

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

					Other postretirement benefits
	Pension benefits
(In millions)	2019		2018		2019		2018
Three months ended June 30
Service cost	$	—	$	—	$	—	$	—
Interest cost	21		19		—		—
Expected return on plan assets	(20)		(26)		—		—
Amortization of prior service credit	—		—		(3)		(3)
Net periodic benefit cost (income)	$	1	$	(7)	$	(3)	$	(3)
Nine months ended June 30
Service cost	$	1	$	1	$	—	$	—
Interest cost	61		56		1		1
Expected return on plan assets	(60)		(78)		—		—
Amortization of prior service credit	—		—		(9)		(9)
Net periodic benefit cost (income)	$	2	$	(21)	$	(8)	$	(8)