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Legal Matters - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Loss Contingencies [Line Items]
Deposits into the U.S. litigation escrow account	$ 500	$ 0
Interchange Multidistrict Litigation
Loss Contingencies [Line Items]
Settlement percentage (in percent)	87.00%
U.S. Covered Litigation
Loss Contingencies [Line Items]
Provision for legal matters	$ 707	$ 27

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- Definition

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