Document And Entity Information	3 Months Ended
	Mar. 31, 2018 shares
Entity Registrant Name	United States Cellular Corporation
Entity Central Index Key	0000821130
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	USM
Common Shares
Entity Common Stock, Shares Outstanding	52,210,981
Series A Common Shares
Entity Common Stock, Shares Outstanding	33,005,877