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Debt - Repurchase 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
Repurchase Agreement | UScellular      
Debt Instrument [Line Items]      
Maximum borrowing capacity   200  
Amount borrowed during the period   60  
Amount borrowed and outstanding   60  
Unused borrowing capacity   140  
Repurchase Agreement | UScellular | Assets available to be pledged      
Debt Instrument [Line Items]      
Equipment installment plan receivables   $ 638  
Repurchase Agreement | UScellular | Subsequent event      
Debt Instrument [Line Items]      
Amount repaid during the period $ 50    
SOFR rate | Repurchase Agreement | UScellular      
Debt Instrument [Line Items]      
Contractual spread   1.25%