Settlement Guarantee Management (Details) $ in Billions	6 Months Ended
Mar. 31, 2025 USD ($)
Settlement Guarantee Management [Abstract]
Maximum settlement exposure	$ 153.4
Average daily settlement exposure	88.4
Total collateral	$ 8.3

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