Information about Oil and Gas Producing Activities (Details 1) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Information About Oil And Gas Producing Activities
Development costs	$ 581	$ 320
Total Costs	$ 581	$ 320

The element represents total costs incurred in oil and gas property acquisition exploration and development.

No definition available.

Name:	cik0001409947_TotalCostsIncurredInOilAndGasPropertyAcquisitionExplorationAndDevelopment
Namespace Prefix:	cik0001409947_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration