Statements of Changes in Net Assets in Liquidation (Liquidation Basis) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Net Assets in Liquidation, beginning of year	$ 1,390,181	$ 1,369,239
Increase (decrease) in net assets in liquidation:
Transfer of interest in New GM Securities from Motors Liquidation Company			9,900,699
Reductions (additions) to reserves for Expected Costs of Liquidation	7,910	(17,488)	(52,993)
Incurrence of funding obligation to Avoidance Action Trust			(13,715)
Liquidating distributions (Note 5)	(1,205,764)	(29,389)	(7,883,466)
Net change in fair value of holdings of New GM Securities	702,654	123,936	(472,801)
Interest income and dividends	4,668	145	98
Income tax benefit (provision) (Note 9)	164,845	(56,262)	(108,583)
Net (decrease) increase in net assets in liquidation	(325,687)	20,942	1,369,239
Net Assets in Liquidation, end of year	$ 1,064,494	$ 1,390,181	$ 1,369,239