Visa Funding and Bancorp Cash Payments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Sep. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Visa Funding
Commitments and Contingencies Disclosure [Line Items]
Visa deposited into the litigation escrow account	$ 150	$ 1,565	$ 400	$ 800	$ 500
Bancorp Cash Payment
Commitments and Contingencies Disclosure [Line Items]
Reduction of liability in cash to the swap counterparty	$ 6	$ 75	$ 19	$ 35	$ 20

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_EscrowDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant