Financial Highlights (Details) - USD ($)	3 Months Ended
Financial Highlights (Details) - USD ($)	Mar. 31, 2020	Mar. 31, 2019
Per share operating performance:
Members' capital per Redeemable Unit, beginning of period (in dollars per unit)	$ 1,100.03	$ 1,126.62
Income/(loss) from investment operations:
Net investment (loss) including incentive fee (in dollars per unit)	(11.51)	(9.36)
Net realized and unrealized gain/(loss) from investment activities (in dollars per unit)	(118.10)	4.88
Total from investment operations (in dollars per unit)	(129.61)	(4.48)
Members' capital per Redeemable Unit, end of year (in dollars per unit)	$ 970.42	$ 1,122.14
Ratio/Supplemental Data:
Ratio of net investment (loss) to average Members' capital (as a percent)	(4.45%)	(3.47%)
Ratio of total expenses to average Members' capital (as a percent)	6.09%	6.02%
Ratio of incentive fee to average Members' capital (as a percent)	0.00%
Ratio of total expenses and incentive fee to average Members' capital (as a percent)	6.09%	6.02%
Total return before incentive fee (as a percent)	(11.78%)	(0.40%)
Incentive fee (as a percent)	0.00%
Total return after incentive fee (as a percent)	(11.78%)	(0.40%)
Members' capital, end of period	$ 82,484,513	$ 136,759,768
Sydling WNT Master Fund LLC
Ratio/Supplemental Data:
Ratio of net investment (loss) to average Members' capital (as a percent)	(2.12%)	(1.21%)
Ratio of total expenses to average Members' capital (as a percent)	3.76%	3.76%
Total return (as a percent)	(11.27%)	0.15%
Members' capital, end of period	$ 82,484,513	$ 136,759,768

Cavendish Futures Fund LLC 10-Q