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Debt - Repurchase Agreement (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |
Equipment installment plan receivables |  | $ 1,211 | $ 1,085
UScellular | Repurchase Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | 200 |
Amount borrowed during the period |  | 110 |
Amount repaid during the period |  | 50 |
Amounts borrowed and outstanding |  | 60 |
Amount available for use |  | 140 |
UScellular | Repurchase Agreement | Assets pledged |  |  |
Debt Instrument [Line Items] |  |  |
Equipment installment plan receivables |  | $ 524 |
SOFR Rate | UScellular | Repurchase Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Contractual spread |  | 1.25% |
Lender's cost of funds | UScellular | Repurchase Agreement | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Contractual spread | 1.35% |  |

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