Statements of Changes in Net Assets in Liquidation (Liquidation Basis) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statements of Changes in Net Assets in Liquidation (Liquidation Basis) [Abstract]
Net Assets in Liquidation, beginning of year	$ 1,369,239
Increase (decrease) in net assets in liquidation:
Transfer of interest in New GM Securities due from Motors Liquidation Company		9,900,699
Additions (net) to reserves for Expected Costs of Liquidation	(17,488)	(52,993)
Incurrence of funding obligation to Avoidance Action Trust		(13,715)
Liquidating distributions (Note 5)	(29,389)	(7,883,466)
Net change in fair value of holdings of New GM Securities	123,936	(472,801)
Interest and dividend income	145	98
Income tax provision	(56,262)	(108,583)
Net increase in net assets in liquidation	20,942	1,369,239
Net Assets in Liquidation, end of year	$ 1,390,181	$ 1,369,239