Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Jun. 30, 2014

Compensation and Retirement Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures

The components of net periodic benefit cost are as follows:

	Pension Benefits												Other Postretirement Benefits
	Three Months Ended June 30,						Nine Months Ended June 30,						Three Months Ended June 30,						Nine Months Ended June 30,
	2014			2013			2014			2013			2014			2013			2014			2013
	(in millions)
Service cost	$	11		$	10		$	34		$	32		$	—		$	—		$	—		$	—
Interest cost	10			9			31			27			—			—			—			—
Expected return on assets	(17		)	(16		)	(51		)	(47		)	—			—			—			—
Amortization of:
Prior service credit	(2		)	(2		)	(6		)	(7		)	—			(1		)	(2		)	(2		)
Actuarial loss (gain)	1			8			1			22			(1		)	—			(1		)	—
Net benefit cost	$	3		$	9		$	9		$	27		$	(1	)	$	(1	)	$	(3	)	$	(2	)
Curtailment gain	—			—			(3		)	—			—			—			—			—
Settlement loss	2			—			3			—			—			—			—			—
Total net periodic benefit cost	$	5		$	9		$	9		$	27		$	(1	)	$	(1	)	$	(3	)	$	(2	)