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Debt - Receivables Securitization Agreement (Details)
$ in Millions
9 Months Ended
Oct. 01, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]      
Amount borrowed   $ 1,418 $ 675
Repayment of long-term debt   $ 1,884 $ 8
Consolidated leverage ratio   3.75  
UScellular | Receivables securitization agreement      
Debt Instrument [Line Items]      
Amount borrowed   $ 500  
Outstanding borrowings   325  
Repayment of long-term debt   200  
Maximum borrowing capacity   450  
Amount available for use   125  
Assets pledged as collateral   $ 437  
Consolidated leverage ratio   3.75  
UScellular | Receivables securitization agreement | Subsequent event      
Debt Instrument [Line Items]      
Amount borrowed $ 125