Employee Benefit Plans (Tables)

6 Months Ended

Mar. 31, 2019

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 March 31
	2019						2018						2019					2018
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.			Foreign		U.S.		Foreign
	(In millions)
Service cost	$	—		$	2		$	—		$	2		$	—		$	—	$	—	$	—
Interest cost		2			1			1			2			1			—		—		—
Expected return on plan assets		(3	)		(2	)		(3	)		(3	)		—			—		—		—
Amortization of prior service credit		—			—			—			—			(1	)		—		—		—
Amortization of actuarial loss		—			—			—			—			—			—		—		—
Settlement and curtailment gain		—			—			—			—			—			—		—		—
Net periodic benefit (credit) cost	$	(1	)	$	1		$	(2	)	$	1		$	—		$	—	$	—	$	—

	Six Months Ended March 31
	2019						2018						2019					2018
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.			Foreign		U.S.			Foreign
	(In millions)
Service cost	$	—		$	4		$	—		$	4		$	—		$	—	$	—		$	—
Interest cost		3			3			2			4			1			—		—			—
Expected return on plan assets		(5	)		(6	)		(5	)		(7	)		—			—		—			—
Amortization of prior service credit		—			—			—			—			(1	)		—		(1	)		—
Amortization of actuarial loss		—			1			—			1			—			—		—			—
Settlement and curtailment gain		—			(6	)		—			—			—			—		—			—
Net periodic benefit (credit) cost	$	(2	)	$	(4	)	$	(3	)	$	2		$	—		$	—	$	(1	)	$	—