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Acquisitions - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2023	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Goodwill				$ 17,997	$ 17,787	$ 15,958
Pismo
Business Acquisition [Line Items]
Cash to be paid to acquire business	$ 1,000
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

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Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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