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Fair Value Measurements and Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
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Dec. 31, 2014 | Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Visa Europe put option | $ 145 us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure | [1] | $ 145 us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure | [1]
Probability of exercise by Visa Europe | 40.00%v_ProbabilityOfExerciseByVisaEurope |  |  |
P/E differential at the time of exercise | 1.9x |  |  |
P/E differential at the time of exercise, ratio | 190.00%v_AssumedPriceToEarningsDifferentialAtTimeOfExerciseRatio |  |  |
Spot price to earnings | 21.7x |  |  |
Spot price to earnings, ratio | 2170.00%v_SpotPriceToEarningsRatio |  |  |
Incremental price to earnings differential compared to estimate | 1.0x |  |  |
Incremental price to earnings differential compared to estimate, ratio | 100.00%v_IncrementalPriceToEarningsDifferentialComparedToEstimateRatio |  |  |
Incremental probability of exercise by Visa Europe | 5.00%v_IncrementalProbabilityOfExerciseByVisaEurope |  |  |
Increase in put option value due to increase in probability of exercise | 18 v_IncreaseInPutOptionValueDueToIncreaseInProbabilityOfExercise |  |  |
Incremental assumed price to earnings differential at time of exercise | 1.0x |  |  |
Incremental P/E differential at time of exercise, ratio | 100.00%v_IncrementalAssumedPriceToEarningsDifferentialAtTimeOfExerciseRatio |  |  |
Increase in put option value due to increase in price to earnings differential | 84 v_IncreaseInPutOptionValueDueToIncreaseInPriceToEarningsDifferential |  |  |
Non-marketable equity investments | 32 us-gaap_OtherInvestmentNotReadilyMarketableFairValue |  | 35 us-gaap_OtherInvestmentNotReadilyMarketableFairValue |
Available-for-sale securities, gross unrealized gains | 19 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax |  | 48 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax |
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 3 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |  |  |
Available-for-sale securities, gross unrealized losses |  |  | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Visa Europe put option | $ 145 us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |
[1] | The put option is exercisable at any time at the sole discretion of Visa Europe with payment required 285 days thereafter. Classification in current liabilities is not an indication of management’s expectation of exercise and simply reflects the fact that the obligation resulting from the exercise of the instrument could become payable within 12 months. The fair value of the put option does not represent the actual purchase price that the Company may be required to pay if the option is exercised, which would likely be in excess of $10 billion.

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Fair value portion of liability related to investment contracts for example, but not limited to, guaranteed investment contract or annuities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6487514&loc=d3e32427-158581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 14 -Article 7 + Details
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- Definition Value of the other investment not readily marketable determined by management based upon fair value methods, including pricing of similar securities and valuation techniques, that was used to record the investment for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 820 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710923&loc=d3e45360-110995 + Details
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