Intangible Assets and Goodwill - Fair Value of Intangible Assets and Related Accumulated Amortization Expense (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,036	$ 1,020
Accumulated Amortization	(695)	(613)
Finite-Lived Intangible Assets, Net	341	407
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	27,323	27,401
Gross	28,359	28,421
Net	27,664	27,808
Customer relationships and reacquired rights
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	23,239	23,317
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	726	709
Accumulated Amortization	(440)	(376)
Finite-Lived Intangible Assets, Net	286	333
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross	199	199
Accumulated Amortization	(148)	(134)
Finite-Lived Intangible Assets, Net	51	65
Reseller relationships
Finite-Lived Intangible Assets [Line Items]
Gross	95	95
Accumulated Amortization	(92)	(89)
Finite-Lived Intangible Assets, Net	3	6
Other
Finite-Lived Intangible Assets [Line Items]
Gross	16	17
Accumulated Amortization	(15)	(14)
Finite-Lived Intangible Assets, Net	$ 1	$ 3

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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