Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 20, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000096223
Entity Registrant Name	LEUCADIA NATIONAL CORP
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		366,602,638