Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Schedule of Pension and Other Postretirement Benefits

	Pension Benefits
	U.S. Plans						Non-U.S. Plans
	Three Months Ended March 31,						Three Months Ended March 31,
	2019			2018			2019			2018
	(in millions)
Service cost	$	—		$	—		$	1		$	1
Interest cost	8			8			4			3
Expected return on plan assets	(18		)	(18		)	(5		)	(5		)
Total net periodic benefit cost (income)	$	(10	)	$	(10	)	$	—		$	(1	)

	Pension Benefits
	U.S. Plans						Non-U.S. Plans
	Six Months Ended March 31,						Six Months Ended March 31,
	2019			2018			2019			2018
	(in millions)
Service cost	$	—		$	—		$	2		$	2
Interest cost	16			16			7			6
Expected return on plan assets	(36		)	(35		)	(9		)	(10		)
Total net periodic benefit cost (income)	$	(20	)	$	(19	)	$	—		$	(2	)