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Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Millions	Mar. 10, 2022	Mar. 31, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Goodwill		$ 18,143	$ 15,958
Tink
Business Acquisition [Line Items]
Deferred tax liabilities	$ (71)
Other net assets acquired (liabilities assumed)	22
Goodwill	1,577
Total consideration	$ 1,863
Weighted-Average Useful Life	5 years
Tink \| Technology
Business Acquisition [Line Items]
Finite-lived intangibles	$ 245
Weighted-Average Useful Life	4 years
Tink \| Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles	$ 90
Weighted-Average Useful Life	6 years