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Legal Matters - Additional Information (Detail)
$ in Millions
 1 Months Ended 2 Months Ended 5 Months Ended 12 Months Ended 125 Months Ended 127 Months Ended
May 29, 2020
state
Dec. 13, 2019
USD ($)
Sep. 17, 2018
USD ($)
Jun. 30, 2016
litigation_case
Oct. 31, 2011
atm_operator
financial_institution
Jun. 16, 2021
state
Mar. 31, 2017
merchant
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2012
USD ($)
Nov. 15, 2023
merchant
Nov. 15, 2023
case_filed
merchant
Jun. 01, 2022
claim
Sep. 30, 2021
USD ($)
Loss Contingencies [Line Items]                            
Deposits into the U.S. litigation escrow account               $ 1,000 $ 850          
Loss contingency accrual               1,751 1,456         $ 983
Number of states | state 24         25                
Number of class action claims | claim                         2  
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               906            
Deposits into the U.S. litigation escrow account               1,000            
Period of accrual     5 years                      
Company's share of an additional settlement payment               726 301          
Loss contingency accrual               1,621 1,441         $ 881
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                     72.00% 72.00%    
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               $ 906 $ 861          
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 (more than) | 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                     1,150      
Number of claims settled | merchant                     175      
Number of claims pending | merchant                     900 900    
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