Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures

	U.S. Plans											Non-U.S. Plans
	Pension Benefits						Other Postretirement Benefits					Pension Benefits
	Three Months Ended March 31,						Three Months Ended March 31,					Three Months Ended March 31,
	2017			2016			2017		2016			2017
	(in millions)
Service cost	$	—		$	—		$	—	$	—		$	1
Interest cost	9			10			—		—			2
Expected return on assets	(17		)	(18		)	—		—			(4		)
Amortization of:
Prior service credit	—			—			—		(1		)	—
Actuarial loss	4			2			—		—			1
Curtailment gain	—			—			—		—			—
Settlement loss	11			—			—		—			—
Total net periodic benefit cost	$	7		$	(6	)	$	—	$	(1	)	$	—

	U.S. Plans												Non-U.S. Plans
	Pension Benefits						Other Postretirement Benefits						Pension Benefits
	Six Months Ended March 31,						Six Months Ended March 31,						Six Months Ended March 31,
	2017			2016			2017			2016			2017
	(in millions)
Service cost	$	—		$	13		$	—		$	—		$	3
Interest cost	18			21			—			—			5
Expected return on assets	(35		)	(35		)	—			—			(8		)
Amortization of:
Prior service credit	—			(1		)	(1		)	(2		)	—
Actuarial loss	8			4			—			—			1
Curtailment gain	—			(8		)	—			—			—
Settlement loss	13			—			—			—			—
Total net periodic benefit cost	$	4		$	(6	)	$	(1	)	$	(2	)	$	1