Stockholders' Equity - Schedule of As-Converted Class B Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Equity [Abstract]
Reduction in equivalent number of class A common stock (in shares)	5	5	4
Effective price per share (in dollars per share)	$ 274.62	$ 221.33	$ 205.06
Deposits into the U.S. litigation escrow account	$ 1,500	$ 1,000	$ 850

Number of shares, on an as-converted basis, that have been repurchased through the Escrow Funding during the period.

No definition available.

Name:	v_StockAsConvertedRepurchasedDuringPeriodThroughEscrowFundingShares
Namespace Prefix:	v_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration