Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Jun. 30, 2012

Pension and Other Postretirement Benefits [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,
	2012			2011			2012			2011			2012		2011			2012			2011
	(in millions)
Service cost	$	10		$	10		$	29		$	30		$	—	$	—		$	—		$	—
Interest cost	10			10			30			29			—		—			1			1
Expected return on assets	(14		)	(13		)	(41		)	(40		)	—		—			—			—
Amortization of:
Prior service credit	(2		)	(3		)	(7		)	(7		)	—		—			(2		)	(2		)
Actuarial loss	8			5			24			14			—		(1		)	—			(1		)
Settlement loss	3			—			3			—			—		—			—			—
Total net periodic benefit cost	$	15		$	9		$	38		$	26		$	—	$	(1	)	$	(1	)	$	(2	)