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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Operating Activities
Net income	$ 1,569us-gaap_ProfitLoss	$ 1,407us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of client incentives	713v_AmortizationOfClientIncentives	599v_AmortizationOfClientIncentives
Share-based compensation	45us-gaap_ShareBasedCompensation	45us-gaap_ShareBasedCompensation
Excess tax benefit for share-based compensation	(58)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	(54)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Depreciation and amortization of property, equipment, technology and intangible assets	120us-gaap_DepreciationAndAmortization	107us-gaap_DepreciationAndAmortization
Deferred income taxes	97us-gaap_DeferredIncomeTaxExpenseBenefit	19us-gaap_DeferredIncomeTaxExpenseBenefit
Other	(19)us-gaap_OtherNoncashIncomeExpense	5us-gaap_OtherNoncashIncomeExpense
Change in operating assets and liabilities:
Settlement receivable	286v_IncreaseDecreaseInSettlementReceivable	(89)v_IncreaseDecreaseInSettlementReceivable
Accounts receivable	(78)us-gaap_IncreaseDecreaseInAccountsReceivable	(79)us-gaap_IncreaseDecreaseInAccountsReceivable
Client incentives	(687)v_IncreaseDecreaseInVolumeAndSupportIncentives	(616)v_IncreaseDecreaseInVolumeAndSupportIncentives
Other assets	(141)us-gaap_IncreaseDecreaseInOtherOperatingAssets	(77)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable	10us-gaap_IncreaseDecreaseInAccountsPayable	(80)us-gaap_IncreaseDecreaseInAccountsPayable
Settlement payable	(477)v_IncreaseDecreaseInSettlementPayable	21v_IncreaseDecreaseInSettlementPayable
Accrued and other liabilities	484us-gaap_IncreaseDecreaseInAccruedLiabilities	334us-gaap_IncreaseDecreaseInAccruedLiabilities
Accrued litigation (Note 11)	(103)v_IncreaseDecreaseInAccruedLitigation	(1)v_IncreaseDecreaseInAccruedLitigation
Net cash provided by operating activities	1,761us-gaap_NetCashProvidedByUsedInOperatingActivities	1,541us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities
Purchases of property, equipment, technology and intangible assets	(104)us-gaap_PaymentsToAcquireProductiveAssets	(120)us-gaap_PaymentsToAcquireProductiveAssets
Investment securities, available-for-sale:
Purchases	(758)us-gaap_PaymentsToAcquireAvailableForSaleSecurities	(754)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from sales and maturities	226us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	600us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Purchases of / contributions to other investments	0us-gaap_PaymentsToAcquireOtherInvestments	(2)us-gaap_PaymentsToAcquireOtherInvestments
Net cash used in investing activities	(636)us-gaap_NetCashProvidedByUsedInInvestingActivities	(276)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities
Repurchase of class A common stock (Note 7)	(803)us-gaap_PaymentsForRepurchaseOfCommonStock	(1,091)us-gaap_PaymentsForRepurchaseOfCommonStock
Dividends paid (Note 7)	(297)us-gaap_PaymentsOfDividends	(254)us-gaap_PaymentsOfDividends
Payments from litigation escrow account—retrospective responsibility plan (Note 2 and Note 11)	100v_PaymentfromReturntoLitigationEscrowAccountRetrospectiveResponsibilityPlan	0v_PaymentfromReturntoLitigationEscrowAccountRetrospectiveResponsibilityPlan
Cash proceeds from exercise of stock options	30us-gaap_ProceedsFromStockOptionsExercised	38us-gaap_ProceedsFromStockOptionsExercised
Restricted stock and performance-based shares settled in cash for taxes	(100)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation	(77)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Excess tax benefit for share-based compensation	58us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	54us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash used in financing activities	(1,012)us-gaap_NetCashProvidedByUsedInFinancingActivities	(1,330)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents	1us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents	0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Increase (decrease) in cash and cash equivalents	114us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(65)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year	1,971us-gaap_CashAndCashEquivalentsAtCarryingValue	2,186us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period	2,085us-gaap_CashAndCashEquivalentsAtCarryingValue	2,121us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosure
Income taxes paid, net of refunds	57us-gaap_IncomeTaxesPaidNet	96us-gaap_IncomeTaxesPaidNet
Accruals related to purchases of property, equipment, technology and intangible assets	$ 21us-gaap_CapitalExpendituresIncurredButNotYetPaid	$ 20us-gaap_CapitalExpendituresIncurredButNotYetPaid

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Section 45

-Paragraph 13

-Subparagraph (a),(b)

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- Definition

The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Section 45

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-Subparagraph (c)

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

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-Section 45

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

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-Publisher FASB

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-Publisher FASB

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-Topic 810

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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- Definition

The net change in client incentives due to amortization or adjustments recognized on the consolidated statements of operations.

+ References

No definition available.

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- Definition

Litigation payments made during the period.

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No definition available.

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- Definition

The net change during the reporting period in settlement payable.

+ References

No definition available.

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The net change during the reporting period in settlement receivable.

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No definition available.

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The net change in volume and support incentives for net payments made during the period.

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No definition available.

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- Definition

Payment from (Return to) Litigation Escrow Account-Retrospective Responsibility Plan

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No definition available.

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