Employee Benefit Plans (Tables)

9 Months Ended

Jun. 30, 2015

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 June 30
	2015						2014						2015					2014
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.			Foreign		U.S.			Foreign
	(Dollars in millions)
Service cost	$	—		$	2		$	1		$	2		$	—		$	—	$	—		$	—
Interest cost		2			3			2			4			—			1		1			1
Expected return on plan assets		(3	)		(4	)		(3	)		(5	)		—			—		—			—
Amortization of prior service credit		—			—			—			—			(1	)		—		(1	)		—
Amortization of actuarial loss		—			1			—			1			—			—		—			—
Net periodic benefit (credit) cost	$	(1	)	$	2		$	—		$	2		$	(1	)	$	1	$	—		$	1

	Nine Months Ended June 30
	2015						2014						2015					2014
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.			Foreign		U.S.			Foreign
	(Dollars in millions)
Service cost	$	—		$	7		$	2		$	7		$	—		$	—	$	—		$	—
Interest cost		5			9			6			12			1			1		2			1
Expected return on plan assets		(8	)		(12	)		(8	)		(15	)		—			—		—			—
Amortization of prior service credit		—			—			—			—			(2	)		—		(2	)		—
Amortization of actuarial loss		—			3			—			3			—			—		—			—
Settlement costs		—			18			—			—			—			—		—			—
Net periodic benefit (credit) cost	$	(3	)	$	25		$	—		$	7		$	(1	)	$	1	$	—		$	1