Liquidating Distributions - Additional Information (Detail) (USD $)	Sep. 30, 2013	Sep. 26, 2013
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Cash distributions	$ 13,000
Proposed Nova Scotia allowed general unsecured claims	1,550,000,000
Proforma additional liquidating distributions payable	474,765,000
New GM Common Stock [Member]
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
GUC Trust distribution obligation	1,306,105
Proposed Settlement Distribution Allowance		6,174,015
New GM Series A Warrants [Member]
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
GUC Trust distribution obligation	1,187,320
Proposed Settlement Distribution Allowance		5,612,741
New GM Series B Warrants [Member]
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
GUC Trust distribution obligation	1,187,320
Proposed Settlement Distribution Allowance		5,612,741
Cash Distribution [Member]
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Cash distributions	13,000
New GM Securities [Member]
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Proforma additional liquidating distributions payable	$ 474,765,000
GUC Trust Units [Member]
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Proposed Settlement Distribution of Trust Units		1,550,000