Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Oct. 31, 2022
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2022
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	333-203841
Entity Registrant Name	ATEL 17, LLC
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	90-1108275
Entity Address, Address Line One	The Transamerica Pyramid
Entity Address, Address Line Two	600 Montgomery Street, 9th Floor
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94111
City Area Code	415
Local Phone Number	989-8800
Title of 12(g) Security	NONE
No Trading Symbol Flag	true
Security Exchange Name	NONE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Smaller Reporting Company	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001640982
Amendment Flag	false
Entity Units Outstanding		2,565,749