Plan of Liquidation (Details Textual) (USD $)	1 Months Ended		12 Months Ended					9 Months Ended
	Jan. 31, 2013	Mar. 31, 2012	Mar. 31, 2012	Dec. 31, 2012	Nov. 21, 2012	Dec. 15, 2011	Mar. 31, 2011	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2012 Series A Warrants [Member]	Dec. 31, 2012 Series B Warrants [Member]	Dec. 15, 2011 New GM Series A Warrants [Member]	Dec. 15, 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
Liquidation of New GM Securities								294,133	267,392	267,392
Plan of Liquidation (Textual) [Abstract]
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
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
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				101,400,000
New GM Securities reserved and set aside for potential Taxes on Distribution				293,900,000
Tax basis on securities held				1,087,800,000
Proceeds from liquidation of securities to fund avoidance action trust costs		13,700,000
Residual wind-down assets						$ 41,400,000