Plan of Liquidation - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended	52 Months Ended	57 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Aug. 05, 2015	Dec. 31, 2015	Mar. 31, 2012	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	$ 20,000,000	$ 20,000,000		$ 20,000,000			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
Reserve for Disputed General Unsecured Claims	50,000,000	50,000,000		50,000,000
Amount of Term Loan Avoidance Action							1,500,000,000
Dividends received			$ 24,700,000
Contribution from MLC							52,700,000
Remaining Administrative Fund designated for identified costs and liabilities	8,000,000	8,000,000		8,000,000
Initial Reporting Cash							$ 5,700,000
Appropriated Distributable Cash	12,000,000
Aggregate Other Administrative Cash	15,800,000	15,800,000		15,800,000
Distributable Cash set aside for projected Trust fees, costs and expenses	46,600,000	46,600,000		46,600,000
Distributable Cash set aside for potential income taxes on dividends received on Holdings of Common Stock	2,300,000	2,300,000		2,300,000
Distributable Cash set aside for potential Taxes on Distribution	109,700,000	109,700,000		109,700,000
Capital loss carryovers	182,400,000	182,400,000		182,400,000
Net operating loss carryovers	97,300,000	97,300,000		97,300,000
Residual Wind-Down Assets						$ 42,800,000
Residual Wind-Down Assets cash and cash equivalents and marketable securities						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	9,500,000	9,500,000		9,500,000
Residual Wind-Down Assets held by the GUC Trust aggregated	22,300,000	22,300,000		22,300,000
Remaining Residual Wind-Down Claims	500,000	500,000		500,000
Cash received for funding Indenture Trustee Fiscal and Paying Agent Costs and Reporting Costs						3,400,000
Funds for Indenture Trustee/Fiscal Paying Agent Costs	300,000	300,000		300,000
Cash received for indenture trustee and paying agent costs						1,400,000
Cash received for reporting cash						$ 2,000,000
Avoidance Action Trust Proposed Agreement [Member]
Class of Warrant or Right [Line Items]
Term loan avoidance action claims allowed	55,000
Proposed remaining potential liability of GUC Trust for Term Loan Avoidance Action Claims		75,000,000
Proposed cash payment to Avoidance Action Trust		$ 75,000,000
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
Warrants expiration date		Jul. 10, 2016
Number of securities sold to fund costs and expenses			948,887
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
Warrants expiration date		Jul. 10, 2019
Number of securities sold to fund costs and expenses			948,887
New GM Securities [Member]
Class of Warrant or Right [Line Items]
Aggregate sales of new GM Securities to fund costs and expenses				61,700,000
Aggregate dividend cash associated with sales of New GM Securities to fund costs			$ 200,000
Cash and Cash Equivalents and Marketable Securities [Member]
Class of Warrant or Right [Line Items]
Remaining Administrative Fund aggregated	8,233,000	$ 8,233,000		8,233,000
Aggregate Other Administrative Cash	15,790,000	15,790,000		15,790,000
Residual Wind-Down Assets	22,167,000	22,167,000		22,167,000
Residual Wind-Down Assets held by the GUC Trust aggregated	22,200,000	22,200,000		22,200,000
Funds for Indenture Trustee/Fiscal Paying Agent Costs	319,000	319,000		319,000
Other Assets And Deposits [Member]
Class of Warrant or Right [Line Items]
Residual Wind-Down Assets held by the GUC Trust aggregated	$ 100,000	$ 100,000		$ 100,000
New GM Common Stock [Member]
Class of Warrant or Right [Line Items]
Distributable assets number of securities							150,000,000
Securities authorized for sale					$ 13,700,000
Number of securities sold to fund costs and expenses			1,043,801