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Benefit Plans - Changes in Benefit Obligation for Postemployment Benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Change in benefit obligation:
Beginning obligation	$ 186	$ 163
Service cost	20	22	16
Interest cost	7	6	6
Benefits paid	(30)	(29)
Actuarial loss	1	25
Benefit obligation at September 30	$ 184	$ 186	$ 163

The carrying amount as of the balance sheet date of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement.

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