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Debt - Receivables Securitization Agreement (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |
Equipment installment plan receivables | $ 1,110 | $ 1,151
UScellular | Receivables securitization agreement |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 450 |
Amount repaid during the period | 188 |
Amount borrowed during the period | 40 |
Amounts borrowed and outstanding | 2 |
Amount available for use | 448 |
UScellular | Receivables securitization agreement | Assets pledged |  |
Debt Instrument [Line Items] |  |
Equipment installment plan receivables | $ 94 |
Lender's cost of funds | UScellular | Receivables securitization agreement |  |
Debt Instrument [Line Items] |  |
Contractual spread | 1.15% |

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