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Liquidating Distributions - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Distribution Made to Limited Partner [Line Items]  
Cash distributions payable $ 0.2ck0000040730_LiquidatingDistributionObligationInCash
New GM Common Stock [Member]  
Distribution Made to Limited Partner [Line Items]  
GUC Trust distribution obligation 79,796ck0000040730_LiquidatingDistributionObligation
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= ck0000040730_NewGeneralMotorsCompanyCommonStockMember
New GM Series A Warrants [Member]  
Distribution Made to Limited Partner [Line Items]  
GUC Trust distribution obligation 72,441ck0000040730_LiquidatingDistributionObligation
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= ck0000040730_NewGeneralMotorsCompanySeriesaWarrantsMember
New GM Series B Warrants [Member]  
Distribution Made to Limited Partner [Line Items]  
GUC Trust distribution obligation 72,441ck0000040730_LiquidatingDistributionObligation
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= ck0000040730_NewGeneralMotorsCompanySeriesBWarrantsMember