2.2.0.25truefalse41601 - Disclosure - Consolidation of Variable Interest Entity (Narrative) (Details)truefalseIn Millions, unless otherwise specifiedfalse1falsefalseUSDfalsefalse1/1/2009 - 3/1/2009
USD ($)
$Duration_1_1_2009_To_3_1_20092http://www.sec.gov/CIK0001141391duration2009-01-01T00:00:002009-03-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2010 - 12/31/2010
USD ($) / shares
USD ($)
$Duration_1_1_2010_To_12_31_2010http://www.sec.gov/CIK0001141391duration2010-01-01T00:00:002010-12-31T00:00:00Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDfalsefalse1/1/2009 - 12/31/2009
USD ($)
USD ($) / shares
$Duration_1_1_2009_To_12_31_2009http://www.sec.gov/CIK0001141391duration2009-01-01T00:00:002009-12-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$4falsefalseUSDfalsefalse1/1/2008 - 12/31/2008
USD ($)
USD ($) / shares
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sefalsefalsefalsefalse2truefalsefalse361000000361falsetruefalsefalsefalse3truefalsefalse401000000401falsetruefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMaximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each
group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 45
-Paragraph 13
-Subparagraph b
falsefalse3false0ma_MunicipalBondsCancelledmafalsecreditdurationMunicipal Bonds Cancelledfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalse
false154000000154falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse154000000154[1]falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryMunicipal Bonds CancelledNo authoritative reference available.falsefalse4false0us-gaap_InvestmentIncomeInterestus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse4800000048falsefalsefalsefalsefalse3truefalsefalse5600000056falsefalsefalsefalsefalse4truefalsefalse109000000109falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryIncome derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 14
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 5
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alse00falsefalsefalsefalsefalse2truefalsefalse5200000052falsefalsefalsefalsefalse3truefalse
false115000000115falsefalsefalsefalsefalse4truefalsefalse104000000104falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cost of borrowed funds accounted for as interest that was charged against earnings during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 34
-Paragraph 21
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 9
-Subsection II
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 9
-Article 9
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/Id>falsefalseUSDtruefalse{us-gaap_GuaranteeObligationsByNatureAxis} : Guarantee of Indebtedness [Member]
1/1/2009 - 3/1/2009
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alse0ma_GuarantorObligationsPercentOfObligationGuaranteedmafalsenadurationGuarantor Obligations, Percent of Obligation Guaranteedfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.85150.8515falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureGuarantor O
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-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 45
-Paragraph 13
-Subparagraph b
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/Id>falsefalseUSDtruefalse{us-gaap_VariableInterestByInterestTypeAxis} : Variable Interest, Held by Entity [Member]
1/1/2009 - 3/1/2009
USD ($)
$Duration_1_1_2009_To_3_1_20093http://www.sec.gov/CIK0001141391duration2009-01-01T00:00:002009-03-01T00:00:00falsefalseVariable Interest, Held by Entity [Member]us-gaap_VariableInterestByInterestTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEnterpriseMemberus-gaap_VariableInterestByInterestTypeAxisexplicitMemberUnit12Standardhtt
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r]
1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19
-Subparagraph a
-Article 5
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 7
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph b
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 14
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 5
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00falsefalsefalsefalsefalse4truefalsefalse1100000011falsetruefalsefalsefalseMonetaryxbrli:moneta
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 34
-Paragraph 21
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 9
-Subsection II
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 9
-Article 9
falsefalse1
See Note 16 (Consolidation of Variable Interest Entity) for further details. 416Consolidation of Variable Interest Entity (Narrative) (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruetrue
