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Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 21, 2016
Derivative [Line Items] |  |  |  |
Reduction in earnings from excluded forward points and ineffectiveness | $ 18 | $ 30 | $ 29 |
Expected amount of accumulated other comprehensive income (loss) expected to be reclassified | 49 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 1,136 | (218) | $ 1 |
Visa Europe |  |  |  |
Derivative [Line Items] |  |  |  |
Net investment |  |  |  | $ 18,800
Visa Europe | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Deferred cash consideration liability | 1,200 |  |  |
Prepaid and other current assets |  |  |  |
Derivative [Line Items] |  |  |  |
Cash flow hedges in an asset position | 8 |  |  |
Accrued Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Cash flow hedges in a liability position | 64 |  |  |
Collateral received with counterparties | 2 |  |  |
Other Assets |  |  |  |
Derivative [Line Items] |  |  |  |
Posted collateral | 51 |  |  |
Foreign exchange derivative instruments |  |  |  |
Derivative [Line Items] |  |  |  |
The aggregate notional amount of the Company's foreign currency forward contracts outstanding | 1,800 | 1,600 |  |
Foreign exchange derivative instruments | Visa Europe |  |  |  |
Derivative [Line Items] |  |  |  |
The aggregate notional amount of the Company's foreign currency forward contracts outstanding | $ 1,000 | $ 1,100 |  |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
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- Definition Fair value as of the balance sheet date of all foreign currency derivative assets designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,c) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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