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Legal Matters - Additional Information (Detail) $ in Millions					1 Months Ended	2 Months Ended	5 Months Ended	12 Months Ended			113 Months Ended	115 Months Ended
	May 29, 2020 state	Dec. 13, 2019 USD ($)	Sep. 17, 2018 USD ($)	Jun. 30, 2016 litigation_case	Oct. 31, 2011 financial_institution atm_operator	Jun. 16, 2021 state	Mar. 31, 2017 merchant	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2012 USD ($)	Nov. 16, 2022 merchant	Nov. 16, 2022 case_filed merchant	Sep. 30, 2020 USD ($)
Loss Contingencies [Line Items]
Deposits into the litigation escrow account								$ 850	$ 0
Loss contingency accrual								1,456	983				$ 914
Number of states | state	24					25
Visa, MasterCard, and Certain U.S. Financial Institutions
Loss Contingencies [Line Items]
Loss contingency accrual			$ 5,300
Possible return to defendants		$ 700
U.S. Covered Litigation
Loss Contingencies [Line Items]
Provision for legal matters								861
Deposits into the litigation escrow account								850
Period of accrual			5 years
Company's share of an additional settlement payment								301	7
Loss contingency accrual								1,441	881				$ 888
Possible return to defendants		$ 467
U.S. Covered Litigation | Settled Litigation
Loss Contingencies [Line Items]
Company's share of an additional settlement payment			$ 600
Class Plaintiffs
Loss Contingencies [Line Items]
Payments for legal settlements										$ 4,000
Settlement, further distribution of default interchange										$ 500
Loss contingency, further distributions, default period										8 months
Loss contingency, number of cases appointed counsel | litigation_case				2
Interchange Multidistrict Litigation | Subsequent Event
Loss Contingencies [Line Items]
Settlement percentage											58.00%	58.00%
Interchange Multidistrict Litigation | U.S. Covered Litigation
Loss Contingencies [Line Items]
Provision for legal matters										$ 1,100
Interchange Multidistrict Litigation | U.S. Covered Litigation
Loss Contingencies [Line Items]
Provision for legal matters								$ 861	$ 0
Interchange Multidistrict Litigation | U.S. Covered Litigation | Visa, MasterCard, and Certain U.S. Financial Institutions
Loss Contingencies [Line Items]
Provision for legal matters			$ 900
Interchange Opt Out Litigation | Subsequent Event
Loss Contingencies [Line Items]
Number of opt-out cases filed | case_filed												50
Europe Merchant Litigation
Loss Contingencies [Line Items]
Number of plaintiffs | merchant							1
Europe Merchant Litigation | Subsequent Event
Loss Contingencies [Line Items]
Number of plaintiffs | merchant											850
Number of claims settled | merchant											150
Number of claims pending | merchant											700	700
Europe Merchant Litigation | Threatened Litigation | Subsequent Event
Loss Contingencies [Line Items]
Number of plaintiffs | merchant											30
National ATM Council Class Action
Loss Contingencies [Line Items]
Number of non-bank ATM operators | atm_operator					13
Consumer Class Actions
Loss Contingencies [Line Items]
Number of claims pending | financial_institution					2
Number of financial institutions | financial_institution					3

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