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Document And Entity Information
 9 Months Ended
Sep. 30, 2017
shares
Entity Registrant Name United States Cellular Corporation
Entity Central Index Key 0000821130
Document Type 10-Q
Document Period End Date Sep. 30, 2017
Amendment Flag false
Current Fiscal Year End Date --12-31
Entity Filer Category Accelerated Filer
Document Fiscal Year Focus 2017
Document Fiscal Period Focus Q3
Trading Symbol USM
Common Shares  
Entity Common Stock, Shares Outstanding 52,117,967
Series A Common Shares  
Entity Common Stock, Shares Outstanding 33,005,877