Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 29, 2020	Jun. 28, 2019
Document And Entity Information [Abstract]
Document Type	10-K
Entity Registrant Name	ATEL 14, LLC
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Entity Central Index Key	0001463389
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Filer Category	Non-accelerated Filer
Smaller Reporting Company	true
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 0
Entity Units Outstanding		8,246,919