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Debt - Receivables Securitization Agreement (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 01, 2023
Jun. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Equipment installment plan receivables   $ 1,159 $ 1,211
Current portion of long-term debt   60 $ 19
UScellular | Receivables securitization agreement      
Debt Instrument [Line Items]      
Amount borrowed during the period   115  
Amount repaid during the period   150  
Amount borrowed and outstanding   240  
Amount available for use   210  
Current portion of long-term debt   38  
UScellular | Receivables securitization agreement | Subsequent event      
Debt Instrument [Line Items]      
Amount repaid during the period $ 100    
UScellular | Receivables securitization agreement | Assets available to be pledged      
Debt Instrument [Line Items]      
Equipment installment plan receivables   $ 488  
Lender's cost of funds | UScellular | Receivables securitization agreement      
Debt Instrument [Line Items]      
Contractual spread   0.90%