Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Mar. 31, 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 March 31,						Six Months Ended March 31,						Three Months Ended March 31,					Six Months Ended March 31,
	2014			2013			2014			2013			2014			2013		2014			2013
	(in millions)
Service cost	$	12		$	12		$	23		$	22		$	—		$	—	$	—		$	—
Interest cost	11			9			21			18			—			—		—			—
Expected return on assets	(17		)	(15		)	(34		)	(31		)	—			—		—			—
Amortization of:
Prior service credit	(2		)	(3		)	(4		)	(5		)	(1		)	—		(2		)	(1		)
Actuarial loss	—			7			—			14			—			—		—			—
Net benefit cost	$	4		$	10		$	6		$	18		$	(1	)	$	—	$	(2	)	$	(1	)
Curtailment gain	(3		)	—			(3		)	—			—			—		—			—
Settlement loss	—			—			1			—			—			—		—			—
Total net periodic benefit cost	$	1		$	10		$	4		$	18		$	(1	)	$	—	$	(2	)	$	(1	)