Statements of Cash Flows (Liquidation Basis) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Cash flows from (used in) operating activities
Cash receipts from dividends and interest	$ 4,722	$ 16,113	$ 4,658
Cash paid for professional fees, governance costs and other administrative costs	(13,231)	(12,778)	(20,948)
Cash paid for Residual Wind-Down Claims	(6,202)	(2,618)	(1,678)
Cash receipts for refunds, including amounts due others	158	379
Cash paid for distributions	(130,045)	(3,564)	(663)
Net cash flows used in operating activities	(144,598)	(2,468)	(18,631)
Cash flows from (used in) investing activities
Cash used to purchase marketable securities	(1,984,516)	(83,754)	(118,162)
Cash from maturities and sales of marketable securities	1,354,339	97,194	150,576
Net cash flows (used in) from investing activities	(630,177)	13,440	32,414
Cash flows from financing activities
Cash from sale and liquidation of New GM Securities	741,702	11,579	139
Net cash flows from financing activities	741,702	11,579	139
Net (decrease) increase in cash and cash equivalents	(33,073)	22,551	13,922
Cash and cash equivalents, beginning of year	37,483	14,932	1,010
Cash and cash equivalents, end of year	$ 4,410	$ 37,483	$ 14,932