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Intangible Assets and Goodwill - Fair Value of Intangible Assets and Related Accumulated Amortization Expense (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,135 $ 1,142
Accumulated Amortization (855) (783)
Net 280 359
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets 25,824 24,706
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross 26,959 25,848
Net 26,104 25,065
Customer relationships and reacquired rights    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets 21,740 20,622
Visa trade name    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets 4,084 4,084
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross 829 836
Accumulated Amortization (572) (513)
Net 257 323
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross 195 195
Accumulated Amortization (172) (159)
Net 23 36
Reseller relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross 95 95
Accumulated Amortization (95) (95)
Net 0 0
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross 16 16
Accumulated Amortization (16) (16)
Net $ 0 $ 0