Acquisitions - Additional Information (Details) - USD ($) $ in Millions	Mar. 10, 2022	Dec. 20, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Goodwill			$ 17,787	$ 15,958	$ 15,910
The Currency Cloud Group Limited
Business Acquisition [Line Items]
Total consideration		$ 893
Amount allocated to technology, intangible assets, other net assets acquired and deferred tax liabilities		150
Goodwill		$ 743
Tink AB
Business Acquisition [Line Items]
Goodwill	$ 1,577
Business acquisition, percent acquired	100.00%
Total consideration, cash	$ 1,900