Settlement Guarantee Management (Details) - USD ($) $ in Billions	3 Months Ended
Dec. 31, 2025	Sep. 30, 2025
Settlement Guarantee Management [Abstract]
Maximum settlement exposure	$ 168.6
Average daily settlement exposure	98.4
Total collateral	$ 8.8	$ 8.8

The total of cash deposits and non-cash collateral assets including cash equivalents, pledged securities at market value, letters of credit, guarantees and beneficial rights to trust assets.

No definition available.

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