Condensed Statements of Cash Flows (Liquidation Basis) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash flows from (used in) operating activities
Cash receipts from dividends and interest	$ 1,231	$ 4,386
Cash paid for professional fees, governance costs and other administrative costs	(9,001)	(11,033)
Cash paid for Residual Wind-Down Claims and Costs	(8,339)	(6,028)
Cash receipts for refunds, including amounts due others		204
Cash paid for distributions	(112,355)	(130,036)
Net cash flows used in operating activities	(128,464)	(142,507)
Cash flows from (used in) investing activities
Cash used to purchase marketable securities	(4,698,074)	(1,316,196)
Cash from maturities and sales of marketable securities	4,834,034	703,962
Net cash flows from (used in) investing activities	135,960	(612,234)
Cash flows from (used in) financing activities
Cash from liquidation of New GM Securities		741,702
Cash in Administrative Fund returned to DIP Lenders	(6,000)
Net cash flows (used in) from financing activities	(6,000)	741,702
Net increase (decrease) in cash and cash equivalents	1,496	(13,039)
Cash and cash equivalents, beginning of period	4,410	37,483
Cash and cash equivalents, end of period	$ 5,906	$ 24,444