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Changes in the Escrow Account (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Oct. 29, 2012
Escrow Account [Roll Forward]
Balance at October 1	$ 2,857	$ 1,936		$ 4,082
Deposits into litigation escrow account	1,715	1,200
American Express settlement payments	(140)	(280)
Interest earned, less applicable taxes	0	1
Balance at September 30	4,432	2,857	1,936	4,082
Settlement payable	719	449		350
Litigation provision	4,100	7	(45)
Covered Litigation
Escrow Account [Roll Forward]
Litigation provision	$ (4,098)

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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