Plan of Liquidation (Details) (USD $)	1 Months Ended		12 Months Ended					1 Months Ended	24 Months Ended	1 Months Ended	24 Months Ended	1 Months Ended	24 Months Ended	12 Months Ended			12 Months Ended
	Jan. 31, 2013	Mar. 31, 2012	Mar. 31, 2012	Mar. 31, 2013	Dec. 31, 2012	Dec. 15, 2011	Mar. 31, 2011	Mar. 31, 2012 Common Stock [Member]	Mar. 31, 2013 Common Stock [Member]	Mar. 31, 2012 Series A Warrants [Member]	Mar. 31, 2013 Series A Warrants [Member]	Mar. 31, 2012 Series B Warrants [Member]	Mar. 31, 2013 Series B Warrants [Member]	Mar. 31, 2013 New GM Stock [Member]	Mar. 31, 2013 New GM Series A Warrants [Member]	Mar. 31, 2011 New GM Series A Warrants [Member]	Mar. 31, 2013 New GM Series B Warrants [Member]	Mar. 31, 2011 New GM Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Distributable assets number of securities called by warrants																136,363,635		136,363,635
Exercise price per share																$ 10.00		$ 18.33
Number of securities sold to fund costs and expenses									902,228		820,205		820,205
Tax basis of securities held per security														$ 19.87	$ 11.38		$ 7.88
Number of securities sold to fund avoidance action trust costs								269,422		244,929		244,929
Plan of Liquidation (Textual) [Abstract]
Allowed General Unsecured Claims							$ 29,771,000,000
Disputed general unsecured claims				3,600,000,000			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
Amount of term loan avoidance action							1,500,000,000
Distributable assets new GM shares							150,000,000
Allowed general unsecured claims threshold							35,000,000,000
Potential additional shares to be issued							30,000,000
Allowed general unsecured claims maximum excess amount							7,000,000,000
Additional shares issued							0
Contribution from MLC							52,700,000
Sales of New GM Securities aggregated	18,000,000		32,200,000
Motion to liquidate New GM Securities					17,900,000
New GM Securities with an aggregate fair market value		28,400,000	28,400,000	41,000,000
New GM Securities reserved and set aside for potential Taxes on Distribution		108,600,000	108,600,000	407,300,000
Tax basis on securities held				1,073,000,000
Proceeds from liquidation of securities to fund avoidance action trust costs		13,700,000	13,715,000
Residual wind-down assets						42,800,000
Cash received to fund Avoidance Action Defense Costs						1,400,000
Cash received for funding Indenture Trustee Fiscal and Paying Agent Costs and Reporting Costs						3,400,000
Cash received for funding Indenture Trustee Fiscal and Paying Agent Costs						$ 1,400,000