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Debt - Receivables Securitization Agreement (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 29, 2022
Mar. 31, 2022
Mar. 31, 2021
Debt Instrument [Line Items]      
Repayment of long-term debt   $ 127 $ 0
UScellular | Receivables securitization agreement      
Debt Instrument [Line Items]      
Outstanding borrowings   400  
Repayment of long-term debt   50  
Amount available for use   50  
Assets available to be pledged   $ 529  
UScellular | Receivables securitization agreement | Subsequent event      
Debt Instrument [Line Items]      
Repayment of long-term debt $ 50    
SOFR rate | UScellular | Receivables securitization agreement      
Debt Instrument [Line Items]      
Contractual spread   0.90%