Cover	Sep. 23, 2020
Cover [Abstract]
Document Type	8-K
Amendment Flag	false
Document Period End Date	Sep. 23, 2020
Entity File Number	000-05890
Entity Registrant Name	GCI, LLC
Entity Central Index Key	0000075679
Entity Tax Identification Number	92-0072737
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	12300 Liberty Blvd.
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
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	true