Plan of Liquidation - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended	24 Months Ended
	Mar. 31, 2012	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2014	Dec. 15, 2011	Mar. 31, 2011
Class of Warrant or Right [Line Items]
Allowed General Unsecured Claims						$ 29,771,000,000
Disputed General Unsecured Claims						8,154,000,000
Total aggregate amount of general unsecured claims, both allowed and disputed inclusive of potential term loan avoidance action claims						39,425,000,000
Amount of term loan avoidance action						1,500,000,000
Contribution from MLC						52,700,000
Remaining Administrative Fund aggregated				11,600,000
Remaining Administrative Fund for certain costs and liabilities of the GUC Trust				8,000,000
Remaining Administrative Fund for Wind-Down Costs				3,600,000
Initial reporting cash						5,700,000
Sales of New GM Securities aggregated			50,200,000
Aggregate Other Administrative Cash				13,200,000
New GM Securities with an aggregate fair market value			41,000,000	51,600,000
Dividend Cash set aside for projected Trust fees, costs and expenses				200,000
New GM Securities set aside for projected income taxes on dividends received or declared on common stock fair market value				3,500,000
New GM Securities set aside for potential Taxes on Distribution			407,300,000	536,300,000
Dividend Cash set aside for potential Taxes on Distribution				2,200,000
Proceeds from liquidation of securities to fund avoidance action trust costs	13,700,000	13,715,000
Residual Wind-Down assets					42,800,000
Residual Wind-Down Assets Cash					40,000,000
Cash received to fund Avoidance Action Defense Costs					1,400,000
Residual wind-down assets transferred benefit in prepaid expenses					2,800,000
Avoidance action defense costs in excess of corresponding cash				700,000
Residual Wind-Down Assets held by the GUC Trust aggregated				30,500,000
Remaining Residual Wind-Down Claims				13,100,000
Cash received for funding Indenture Trustee Fiscal and Paying Agent Costs and Reporting Costs					3,400,000
Agents Costs held by the GUC Trust				500,000
Cash received for indenture trustee and paying agent costs					1,400,000
Cash received for reporting cash					2,000,000
Disputed General Unsecured Claims [Member]
Class of Warrant or Right [Line Items]
Disputed General Unsecured Claims				79,500,000
Cash And Cash Equivalents And Marketable Securities [Member]
Class of Warrant or Right [Line Items]
Remaining Administrative Fund aggregated				10,600,000
Prepaid Expenses [Member]
Class of Warrant or Right [Line Items]
Remaining Administrative Fund aggregated				$ 1,000,000
Common Stock [Member]
Class of Warrant or Right [Line Items]
Number of securities sold to fund costs and expenses			902,228
Number of securities sold to fund avoidance action trust costs	269,422
Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Number of securities sold to fund costs and expenses			820,205
Number of securities sold to fund avoidance action trust costs	244,929
Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Number of securities sold to fund costs and expenses			820,205
Number of securities sold to fund avoidance action trust costs	244,929
New GM Common Stock [Member]
Class of Warrant or Right [Line Items]
Distributable assets number of securities						150,000,000
New GM Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Distributable assets number of securities called by warrants						136,363,635
Exercise price per share						$ 10.00
New GM Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Distributable assets number of securities called by warrants						136,363,635
Exercise price per share						$ 18.33