Employee Benefit Plans (Tables)

9 Months Ended

Jun. 30, 2013

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
	2013						2012						2013					2012
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.			Foreign		U.S.			Foreign
	(Dollars in millions)
Service cost	$	1		$	2		$	1		$	2		$	—		$	—	$	—		$	—
Interest cost		1			4			1			3			—			1		1			1
Expected return on plan assets		(2	)		(4	)		(2	)		(3	)		—			—		—			—
Amortization of actuarial loss		1			1			—			1			—			—		—			—
Net periodic benefit cost	$	1		$	3		$	—		$	3		$	—		$	1	$	1		$	1
	Nine months ended June 30
	2013						2012						2013					2012
	Pension Benefits												Postretirement Benefits
	U.S.			Foreign			U.S.			Foreign			U.S.			Foreign		U.S.			Foreign
	(Dollars in millions)
Service cost	$	4		$	7		$	4		$	5		$	—		$	—	$	—		$	—
Interest cost		4			11			4			8			1			1		2			1
Expected return on plan assets		(6	)		(13	)		(6	)		(9	)		—			—		—			—
Amortization of prior service credit		—			—			—			—			(2	)		—		(2	)		—
Amortization of actuarial loss		2			3			1			2			—			—		—			—
Curtailment loss		—			—			—			1			—			—		(1	)		—
Net periodic benefit cost	$	4		$	8		$	3		$	7		$	(1	)	$	1	$	(1	)	$	1