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Stock-Based Compensation - UScellular, Overview (Details) - UScellular - Common Shares - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
UScellular Long-Term Incentive Plans |  |  |
Stock-based compensation, overview |  |  |
Shares reserved | 11,370,000 |  |
Non-Employee Directors' Plan |  |  |
Stock-based compensation, overview |  |  |
Shares reserved | 84,000 |  |
Shares issued | 20,000 | 19,000 | 13,000

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