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Stock-Based Compensation - UScellular, Stock options (Details) - UScellular Long-Term Incentive Plans - Common Shares - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Stock compensation, number of shares |  |  |
Stock options outstanding | 348 | 378 |
Stock compensation, other information |  |  |
Stock options outstanding - weighted average exercise price (USD per share) | $ 42.41 | $ 42.18 |
Aggregate intrinsic value, options exercised | $ 0 |  | $ 0
Maximum |  |  |
Stock compensation, other information |  |  |
Aggregate intrinsic value, options exercised |  | $ 1 |

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