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Debt - Receivables Securitization Agreement (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 29, 2022
Jun. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Equipment installment plan receivables   $ 1,074 $ 1,085
UScellular | Receivables securitization agreement      
Debt Instrument [Line Items]      
Outstanding borrowings   300  
Amount repaid during the period   150  
Amount available for use   150  
UScellular | Receivables securitization agreement | Subsequent event      
Debt Instrument [Line Items]      
Amount repaid during the period $ 50    
UScellular | Receivables securitization agreement | Assets available to be pledged      
Debt Instrument [Line Items]      
Equipment installment plan receivables   $ 426  
SOFR rate | UScellular | Receivables securitization agreement      
Debt Instrument [Line Items]      
Contractual spread   0.90%