Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

	U.S. Plans											Non-U.S. Plans
	Pension Benefits						Other Postretirement Benefits					Pension Benefits
	Three Months Ended December 31,						Three Months Ended December 31,					Three Months Ended December 31,
	2017			2016			2017		2016			2017			2016
	(in millions)
Service cost	$	—		$	—		$	—	$	—		$	1		$	2
Interest cost	8			9			—		—			3			3
Expected return on plan assets	(17		)	(18		)	—		—			(5		)	(4		)
Amortization of:
Prior service credit	—			—			—		(1		)	—			—
Actuarial loss	—			4			—		—			—			—
Settlement loss	—			2			—		—			—			—
Total net periodic benefit cost	$	(9	)	$	(3	)	$	—	$	(1	)	$	(1	)	$	1