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Document and Entity Information - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Jan. 31, 2025
Jun. 28, 2024
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Entity File Number 001-09712    
Entity Registrant Name UNITED STATES CELLULAR CORPORATION    
Entity Central Index Key 0000821130    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 62-1147325    
Entity Address, Address Line One 8410 West Bryn Mawr    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60631    
City Area Code (773)    
Local Phone Number 399-8900    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Financial Statement Error Correction false    
Entity Shell Company false    
Documents Incorporated by Reference
Those sections or portions of the registrant’s Notice of Annual Meeting of Shareholders and Proxy Statement (Proxy Statement) to be filed prior to April 30, 2025, for the 2025 Annual Meeting of Shareholders scheduled to be held May 20, 2025, are herein incorporated by reference into Parts II and III of this report.
    
Common Shares      
Title of 12(b) Security Common Shares, $1 par value    
Trading Symbol USM    
Security Exchange Name NYSE    
Entity Public Float     $ 828
Share Price     $ 55.82
Entity Common Stock, Shares Outstanding   52,000,000  
Series A Common Shares      
Entity Common Stock, Shares Outstanding   33,000,000  
6.25% Senior Notes      
Title of 12(b) Security 6.25% Senior Notes Due 2069    
Trading Symbol UZD    
Security Exchange Name NYSE    
5.50% Senior Notes      
Title of 12(b) Security 5.50% Senior Notes Due 2070    
Trading Symbol UZE    
Security Exchange Name NYSE    
5.50% Senior Notes      
Title of 12(b) Security 5.50% Senior Notes Due 2070    
Trading Symbol UZF    
Security Exchange Name NYSE