Statements of Cash Flows (Liquidation Basis) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Cash flows from (used in) operating activities
Cash receipts from dividends and interest	$ 1,645	$ 4,722	$ 16,113
Cash paid for professional fees, governance costs and other administrative costs	(11,683)	(13,223)	(12,732)
Cash paid for Residual Wind-Down Claims and Costs	(10,339)	(6,210)	(2,664)
Cash paid for distributions	(112,382)	(130,045)	(3,564)
Cash receipts for refunds, including amounts due others		158	379
Net cash flows used in operating activities	(132,759)	(144,598)	(2,468)
Cash flows from (used in) investing activities
Cash used to purchase marketable securities	(5,624,032)	(1,984,516)	(83,754)
Cash from maturities and sales of marketable securities	5,762,701	1,354,339	97,194
Net cash flows from (used in) investing activities	138,669	(630,177)	13,440
Cash flows from financing activities
Cash from sale and liquidation of New GM Securities		741,702	11,579
Cash in Administrative Fund returned to DIP Lenders	(6,000)
Net cash flows (used in) from financing activities	(6,000)	741,702	11,579
Net (decrease) increase in cash and cash equivalents	(90)	(33,073)	22,551
Cash and cash equivalents, beginning of year	4,410	37,483	14,932
Cash and cash equivalents, end of year	$ 4,320	$ 4,410	$ 37,483