Employee Benefit Plans

9 Months Ended

Jun. 30, 2018

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plans

D. Employee Benefit Plans

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

	Three Months Ended June 30
	2018						2017						2018					2017
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.			Foreign		U.S.			Foreign
	(In millions)
Service cost	$	1		$	2		$	1		$	2		$	—		$	—	$	—		$	—
Interest cost		1			2			1			1			1			—		1			—
Expected return on plan assets		(3	)		(4	)		(3	)		(3	)		—			—		—			—
Amortization of prior service credit		—			—			—			—			(1	)		—		(1	)		—
Amortization of actuarial loss		—			1			—			1			—			—		—			—
Net periodic benefit (credit) cost	$	(1	)	$	1		$	(1	)	$	1		$	—		$	—	$	—		$	—

	Nine Months Ended June 30
	2018						2017						2018					2017
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.			Foreign		U.S.			Foreign
	(In millions)
Service cost	$	1		$	6		$	1		$	7		$	—		$	—	$	—		$	—
Interest cost		3			6			3			4			1			—		1			—
Expected return on plan assets		(8	)		(11	)		(8	)		(10	)		—			—		—			—
Amortization of prior service credit		—			—			—			—			(2	)		—		(2	)		—
Amortization of actuarial loss		—			2			—			4			—			—		—			—
Net periodic benefit (credit) cost	$	(4	)	$	3		$	(4	)	$	5		$	(1	)	$	—	$	(1	)	$	—