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Mastercard Inc

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2.2.0.25truefalse41902 - Disclosure - Settlement and Other Risk Management (Estimated Settlement Exposure and Portion of Uncollateralized Settlement Exposure for MasterCard-Branded Transactions) (Details)truefalseIn Millionsfalse1falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : MasterCard-branded Transactions [Member] 3/31/2011 USD ($) $As_Of_3_31_2011_us-gaap_GuaranteeObligationsByNatureAxis_ma_MasterCardBrandedTransactionsMemberhttp://www.sec.gov/CIK0001141391instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMasterCard-branded Transactions [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldima_MasterCardBrandedTransactionsMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : MasterCard-branded Transactions [Member] 12/31/2010 USD ($) 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available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.mastercard.com/taxonomy/role/disclosuresettlementandotherriskmanagementestimatedsettlementexposureandportionofuncollateralizedsettlementexposureformastercardbrandedtransactionsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Cirrus and Maestro Transactions [Member] 3/31/2011 USD ($) $As_Of_3_31_2011_us-gaap_GuaranteeObligationsByNatureAxis_ma_CirrusAndMaestroTransactionsMemberhttp://www.sec.gov/CIK0001141391instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseCirrus and Maestro Transactions [Member]us-gaap_GuaranteeObligationsByNatureAxisxbrldihttp://xbrl.org/2006/xbrldima_CirrusAndMaestroTransactionsMemberus-gaap_GuaranteeObligationsByNatureAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Cirrus and 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