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Holdings of New GM Securities - Holdings of Securities for Trust Beneficiaries (Detail) (Liquidation Basis of Accounting [Member], USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Distribution Made to Limited Partner [Line Items]    
Fair Value $ 917,977mtlqq_HoldingsOfSecuritiesForTrustBeneficiaries $ 1,114,078mtlqq_HoldingsOfSecuritiesForTrustBeneficiaries
New GM Common Stock [Member]
    
Distribution Made to Limited Partner [Line Items]    
Number 11,390,701mtlqq_NumberOfSecuritiesHeldForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanyCommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember		 15,297,307mtlqq_NumberOfSecuritiesHeldForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanyCommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember
Fair Value 427,151mtlqq_HoldingsOfSecuritiesForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanyCommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember		 526,533mtlqq_HoldingsOfSecuritiesForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanyCommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember
New GM Series A Warrants [Member]
    
Distribution Made to Limited Partner [Line Items]    
Number 10,354,971mtlqq_NumberOfSecuritiesHeldForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanySeriesAWarrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember		 13,906,391mtlqq_NumberOfSecuritiesHeldForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanySeriesAWarrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember
Fair Value 287,351mtlqq_HoldingsOfSecuritiesForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanySeriesAWarrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember		 345,435mtlqq_HoldingsOfSecuritiesForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanySeriesAWarrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember
New GM Series B Warrants [Member]
    
Distribution Made to Limited Partner [Line Items]    
Number 10,354,971mtlqq_NumberOfSecuritiesHeldForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanySeriesBWarrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember		 13,906,391mtlqq_NumberOfSecuritiesHeldForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanySeriesBWarrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember
Fair Value $ 203,475mtlqq_HoldingsOfSecuritiesForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanySeriesBWarrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember		 $ 242,110mtlqq_HoldingsOfSecuritiesForTrustBeneficiaries
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mtlqq_NewGeneralMotorsCompanySeriesBWarrantsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember