Employee Benefit Plans (Tables)

3 Months Ended

Dec. 31, 2018

Compensation And Retirement Disclosure [Abstract]

Net Periodic Defined Benefit Pension and Other Postretirement Benefit Costs

Net periodic defined benefit pension and other postretirement benefit costs include the following:

	Three Months Ended December 31
	2018						2017						2018				2017
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.		Foreign		U.S.			Foreign
	(In millions)
Service cost	$	—		$	2		$	—		$	2		$	—	$	—	$	—		$	—
Interest cost		1			2			1			2			—		—		—			—
Expected return on plan assets		(2	)		(4	)		(2	)		(4	)		—		—		—			—
Amortization of prior service credit		—			—			—			—			—		—		(1	)		—
Amortization of actuarial loss		—			1			—			1			—		—		—			—
Settlement and curtailment gain		—			(6	)		—			—			—		—		—			—
Net periodic benefit (credit) cost	$	(1	)	$	(5	)	$	(1	)	$	1		$	—	$	—	$	(1	)	$	—