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Debt - Receivables Securitization Agreement (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jul. 21, 2021
Jul. 20, 2021
Mar. 31, 2021
USD ($)
Debt Instrument [Line Items]          
Repayment of long-term debt $ 1,301 $ 5      
Subsequent event          
Debt Instrument [Line Items]          
Consolidated leverage ratio       3.75  
UScellular | Receivables securitization agreement          
Debt Instrument [Line Items]          
Amount borrowed 100       $ 275
Repayment of long-term debt 200        
Maximum borrowing capacity 450        
Amount available for use 350        
Assets pledged as collateral $ 382        
UScellular | Receivables securitization agreement | Subsequent event          
Debt Instrument [Line Items]          
Consolidated leverage ratio     3.75