Document and Entity Information	6 Months Ended
	May 31, 2019 shares
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	May 31, 2019
Entity Registrant Name	JEFFERIES GROUP LLC
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001084580
Current Fiscal Year End Date	--11-30
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding	0