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Fair Value of Intangible Assets and Related Accumulated Amortization Expense (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross | $ 745 | $ 656
Accumulated Amortization | (418) | (379)
Finite-Lived Intangible Assets, Net | 327 | 277
Indefinite-lived Intangible Assets | 27,521 | 26,957
Gross | 28,266 | 27,613
Net | 27,848 | 27,234
Customer relationships and reacquired rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets | 23,437 | 22,873
Visa trade name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets | 4,084 | 4,084
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 438 | 351
Accumulated Amortization | (237) | (220)
Finite-Lived Intangible Assets, Net | 201 | 131
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 195 | 192
Accumulated Amortization | (93) | (80)
Finite-Lived Intangible Assets, Net | 102 | 112
Reseller relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 95 | 95
Accumulated Amortization | (79) | (70)
Finite-Lived Intangible Assets, Net | 16 | 25
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross | 17 | 18
Accumulated Amortization | (9) | (9)
Finite-Lived Intangible Assets, Net | $ 8 | $ 9

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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