Employee Benefit Plans

6 Months Ended

Mar. 31, 2017

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plans

C. Employee Benefit Plans

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

	Three Months Ended March 31,
	2017						2016						2017					2016
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.			Foreign		U.S.			Foreign
	(In millions)
Service cost	$	—		$	3		$	—		$	2		$	—		$	—	$	—		$	—
Interest cost		1			2			2			2			—			—		—			—
Expected return on plan assets		(2	)		(4	)		(3	)		(4	)		—			—		—			—
Amortization of prior service credit		—			—			—			—			(1	)		—		(1	)		—
Amortization of actuarial loss		—			2			—			1			—			—		—			—
Settlement and curtailment cost (credit)		—			—			—			—			—			—		—			—
Net periodic benefit (credit) cost	$	(1	)	$	3		$	(1	)	$	1		$	(1	)	$	—	$	(1	)	$	—

	Six Months Ended March 31,
	2017						2016						2017					2016
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.			Foreign		U.S.			Foreign
	(In millions)
Service cost	$	—		$	5		$	—		$	4		$	—		$	—	$	—		$	—
Interest cost		2			3			3			4			—			—		—			—
Expected return on plan assets		(5	)		(7	)		(6	)		(7	)		—			—		—			—
Amortization of prior service credit		—			—			—			—			(1	)		—		(2	)		—
Amortization of actuarial loss		—			3			—			2			—			—		—			—
Settlement and curtailment cost (credit)		—			—			—			—			—			—		(1	)		—
Net periodic benefit (credit) cost	$	(3	)	$	4		$	(3	)	$	3		$	(1	)	$	—	$	(3	)	$	—