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Liquidating Distributions - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Distribution Made to Limited Partner [Line Items]    
Cash distributions payable $ 0.2mtlqq_LiquidatingDistributionObligationInCash $ 0.2mtlqq_LiquidatingDistributionObligationInCash
New GM Common Stock [Member]    
Distribution Made to Limited Partner [Line Items]    
GUC Trust distribution obligation 93,114mtlqq_LiquidatingDistributionObligation
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= mtlqq_NewGeneralMotorsCompanyCommonStockMember		 575,278mtlqq_LiquidatingDistributionObligation
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= mtlqq_NewGeneralMotorsCompanyCommonStockMember
New GM Series A Warrants [Member]    
Distribution Made to Limited Partner [Line Items]    
GUC Trust distribution obligation 84,570mtlqq_LiquidatingDistributionObligation
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= mtlqq_NewGeneralMotorsCompanySeriesAWarrantsMember		 522,865mtlqq_LiquidatingDistributionObligation
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= mtlqq_NewGeneralMotorsCompanySeriesAWarrantsMember
New GM Series B Warrants [Member]    
Distribution Made to Limited Partner [Line Items]    
GUC Trust distribution obligation 84,570mtlqq_LiquidatingDistributionObligation
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= mtlqq_NewGeneralMotorsCompanySeriesBWarrantsMember		 522,865mtlqq_LiquidatingDistributionObligation
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= mtlqq_NewGeneralMotorsCompanySeriesBWarrantsMember