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Stock-Based Compensation - UScellular, Overview (Details) - UScellular - Common Shares - shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
UScellular Long-Term Incentive Plans |  |  |
Stock-based compensation, overview |  |  |
Shares reserved | 13,769,000 |  |
Non-Employee Directors' Plan |  |  |
Stock-based compensation, overview |  |  |
Shares reserved | 500,000 |  |
Shares issued | 36,000 | 22,000 | 20,000

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