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2.2.0.7 false Carrying value, Gross Unrecorded Gains and Fair Value of Held-to-Maturity Investment Securities (Detail) (USD $) 155 - Disclosure - Carrying value, Gross Unrecorded Gains and Fair Value of Held-to-Maturity Investment Securities (Detail) true false In Millions false false 1 USD false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 pure Standard http://www.xbrl.org/2003/instance pure 0 shares Standard http://www.xbrl.org/2003/instance shares 0 $ false 2 USD false false iso4217_USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 pure Standard http://www.xbrl.org/2003/instance pure 0 shares Standard http://www.xbrl.org/2003/instance shares 0 $ 5 3 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmount us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 true true false false 337000000 337 false false false 2 true true false false 338000000 338 false false false xbrli:monetaryItemType monetary This item represents the total of all debt securities grouped by maturity dates, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are classified as held-to-maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 false 6 3 ma_HeldToMaturitySecuritiesUnrecognizedGains ma false credit instant As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as... false false false false false false false false false false true negated false 1 false true false false 3000000 3 false false false 2 false true false false 2000000 2 false false false xbrli:monetaryItemType monetary As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain. No authoritative reference available. false 7 3 us-gaap_HeldToMaturitySecuritiesFairValue us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 true true false false 340000000 340 false false false 2 true true false false 340000000 340 false false false xbrli:monetaryItemType monetary This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 true 2 3 false Millions UnKnown UnKnown false true