2.2.0.25truefalse40603 - Disclosure - Investment Securities (Roll-Forward of ARS Investments) (Details)truefalseIn Millionsfalse1falsefalseUSDtruefalse{ma_FairValueAssetsAndLiabilitiesComponentsAxis} : Significant Unobservable Inputs (Level 3) [Member]
1/1/2011 - 3/31/2011
USD ($)
$Duration_1_1_2011_To_3_31_2011_ma_FairValueAssetsAndLiabilitiesComponentsAxis_us-gaap_FairValueInputsLevel3Memberhttp://www.sec.gov/CIK0001141391duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseSignificant Unobservable Inputs (Level 3) [Member]ma_FairValueAssetsAndLiabilitiesComponentsAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberma_FairValueAssetsAndLiabilitiesComponentsAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValueus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse106000000106falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c
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