Collateral (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Settlement Guarantee Management [Abstract]
Cash equivalents	$ 846	$ 823
Pledged securities at market value	260	307
Letters of credit	1,091	1,084
Guarantees	1,940	2,022
Total	$ 4,137	$ 4,236

The Company holds cash deposits and other noncash assets from certain customers in order to ensure their performance of settlement obligations arising from credit, debit and travelers cheque product clearings. The cash collateral assets are restricted and fully offset by corresponding liabilities and both balances are presented on the consolidated balance sheet. Noncash collateral assets are held on behalf of the Company by a third party and are not recorded on the Company's consolidated balance sheet.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant