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Stock-Based Compensation - UScellular, Deferred Stock Units (Details) - Deferred Compensation Stock Units - UScellular Long-Term Incentive Plans - Common Shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of match from annual bonus | 33.00% |  |
Percent of match up to 50% from annual bonus |  | 25.00% | 25.00%
Percent of match above 50% from annual bonus |  | 33.00% | 33.00%
Award vesting period | 3 years |  |

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