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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 |  |  |  |

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