Collateral (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Settlement Guarantee Management [Abstract]
Cash equivalents	$ 1,041v_CustomerCollateralAssets	$ 961v_CustomerCollateralAssets
Pledged securities at market value	142	148
Letters of credit	1,218v_LettersOfCreditCollateral	1,242v_LettersOfCreditCollateral
Guarantees	1,215v_GuaranteesCollateral	1,554v_GuaranteesCollateral
Total	$ 3,616v_CollateralAssets	$ 3,905v_CollateralAssets

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.

Name:	v_CustomerCollateralAssets
Namespace Prefix:	v_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant