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Related Parties - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income from or fees received by related parties	$ 1	$ 1	$ 2
Director
Total operating revenues from related parties		172	597
Investee
Total operating revenues from related parties	$ 19	$ 28	$ 27

Amount of transactions with related party during the financial reporting period.

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- Definition

Revenues arising from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's' management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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