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Document and Entity Information Statement
 12 Months Ended
Mar. 12, 2025
Dec. 31, 2025
Document Type 8-K  
Document Period End Date Mar. 12, 2025  
Entity Registrant Name TELEPHONE AND DATA SYSTEMS, INC.  
Entity Central Index Key 0001051512  
Current Fiscal Year End Date   --12-31
Entity Incorporation, State or Country Code DE  
Entity File Number 001-14157  
Entity Tax Identification Number 36-2669023  
Entity Address, Address Line One 30 North LaSalle Street, Suite 4000  
Entity Address, City or Town Chicago  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60602  
City Area Code (312)  
Local Phone Number 630-1900  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Entity Emerging Growth Company false  
Amendment Flag false  
Common Shares    
Title of 12(b) Security Common Shares, $.01 par value  
Trading Symbol TDS  
Security Exchange Name NYSE  
Depositary Shares each representing a 1/1000th interest in a share of 6.625% Series UU Cumulative Redeemable Perpetual Preferred Stock, $.01 par value    
Title of 12(b) Security Depositary Shares each representing a 1/1000th interest in a share of 6.625% Series UU Cumulative Redeemable Perpetual Preferred Stock, $.01 par value  
Trading Symbol TDSPrU  
Security Exchange Name NYSE  
Depositary Shares each representing a 1/1000th interest in a share of 6.000% Series VV Cumulative Redeemable Perpetual Preferred Stock, $.01 par value    
Title of 12(b) Security Depositary Shares each representing a 1/1000th interest in a share of 6.000% Series VV Cumulative Redeemable Perpetual Preferred Stock, $.01 par value  
Trading Symbol TDSPrV  
Security Exchange Name NYSE