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Summary of Significant Accounting Policies - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
asset_group
unit
reporting_unit
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Basis of presentation      
Number of wireless connections 4,600,000    
Number of broadband, video and voice connections 1,200,000    
Amortization of implementation costs $ 18 $ 19 $ 17
Advertising costs 208 196 $ 203
Expenses related to strategic alternatives review $ 13    
UScellular      
Basis of presentation      
FCC Licenses, period of renewal 12 years    
FCC licenses, number of accounting units | unit 1    
Agent liability $ 50 53  
TDS Telecom      
Basis of presentation      
Number of reporting units | reporting_unit 1    
Loss on impairment of goodwill $ 547 $ 0  
Asset groups | asset_group 1    
UScellular      
Basis of presentation      
Asset groups | asset_group 1    
TDS Telecom | Franchise rights      
Basis of presentation      
Renewal period 10 years    
Minimum      
Basis of presentation      
Amortization period 3 years    
Minimum | UScellular      
Basis of presentation      
FCC Licenses, period of renewal 10 years    
Minimum | Leasehold Improvements      
Basis of presentation      
Useful life 1 year    
Maximum      
Basis of presentation      
Amortization period 5 years    
Maximum | UScellular      
Basis of presentation      
FCC Licenses, period of renewal 15 years    
Maximum | Leasehold Improvements      
Basis of presentation      
Useful life 30 years    
UScellular      
Basis of presentation      
TDS ownership of UScellular 83.00%