2.2.0.7falseObligations Under Litigation Settlements - Additional Information (Detail) (USD $)170 - Disclosure - Obligations Under Litigation Settlements - Additional Information (Detail)truefalseIn Millionsfalsefalse1USDfalsefalsepureStandardhttp://www.xbrl.org/2003/instancepure0iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$63us-gaap_LossContingencyAccrualAtCarryingValueus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabelfalse1truetruefalsefalse18000000001800falsefalsefalsexbrli:monetaryItemTypemonetaryThe carrying amount as of the balance sheet date of the combined total of loss contingency reserves.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
false73ma_PresentValueOfLitigationSettlementObligationmafalsecreditinstantPresent Value of Litigation Settlement Obligationfalsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalsefalse16490000001649falsefalsefalsexbrli:monetaryItemTypemonetaryPresent Value of Litigation Settlement ObligationNo authoritative reference available.false83ma_LegalSettlementLiabilityContingencyAccrualDiscountRatemafalsenainstantRate applied to the undiscounted amount of future Legal settlement payments to arrive at the present value recorded as of the...falsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalsefalse0.05750.0575falsefalsefalseus-types:percentItemTypepureRate applied to the undiscounted amount of future Legal settlement payments to arrive at the present value recorded as of the balance sheet date.No authoritative reference available.false13falseMillionsUnKnownUnKnownfalsetrue