Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	000-05890
Entity Registrant Name	GCI, LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	92-0072737
Entity Address, Address Line One	12300 Liberty Boulevard
Entity Address, City or Town	Englewood,
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80112
City Area Code	720
Local Phone Number	875-5900
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Ex Transition Period	true
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Shell Company	false
Entity Public Float		$ 0
Entity Common Stock, Shares Outstanding	0
Amendment Flag	false
Entity Central Index Key	0000075679
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY