Plan of Liquidation - Additional Information (Detail) (USD $)	6 Months Ended	24 Months Ended						24 Months Ended			1 Months Ended
	Jun. 30, 2014	Mar. 31, 2013	Dec. 15, 2011	Mar. 31, 2011	Jun. 30, 2014 Cash and Cash Equivalents and Marketable Securities [Member]	Jun. 30, 2014 Prepaid Expenses [Member]	Jun. 30, 2014 Other Assets and Deposits [Member]	Mar. 31, 2013 Common Stock [Member]	Mar. 31, 2013 Series A Warrants [Member]	Mar. 31, 2013 Series B Warrants [Member]	Aug. 30, 2014 Subsequent Event [Member]	Mar. 31, 2011 New GM Common Stock [Member]	Mar. 31, 2011 New GM Series A Warrants [Member]	Mar. 31, 2011 New GM Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Allowed General Unsecured Claims				$ 29,771,000,000
Disputed General Unsecured Claims	79,500,000			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
Distributable assets number of securities												150,000,000
Distributable assets number of securities called by warrants													136,363,635	136,363,635
Exercise price per share													$ 10.00	$ 18.33
Dividends received	9,200,000
Dividends declared per share for accrued dividend											$ 0.30
Accrued dividends record date											Sep. 10, 2014
Contribution from MLC				52,700,000
Remaining Administrative Fund aggregated	10,700,000				9,800,000	900,000
Remaining Administrative Fund for certain costs and liabilities of the GUC Trust	8,000,000
Remaining Administrative Fund for Wind-Down Costs	2,700,000
Initial Reporting Cash				5,700,000
Sales of New GM Securities aggregated		50,200,000
Number of securities sold to fund costs and expenses								902,228	820,205	820,205
Aggregate Other Administrative Cash	11,500,000
New GM Securities with an aggregate fair market value	64,300,000
Dividend Cash set aside for projected Trust fees, costs and expenses	500,000
New GM Securities set aside for projected income taxes on dividends received on common stock fair market value	5,400,000
New GM Securities set aside for potential Taxes on Distribution	552,000,000
Dividend Cash set aside for potential Taxes on Distribution	4,300,000
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	1,100,000
Residual Wind-Down Assets held by the GUC Trust aggregated	30,000,000				29,900,000		100,000
Remaining Residual Wind-Down Claims	1,300,000
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