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Stock-Based Compensation - U.S. Cellular, Overview (Details) - Common Shares | 12 Months Ended
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Dec. 31, 2019 shares
U.S. Cellular Long-Term Incentive Plans | Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Remaining contractual term | 10 years
Award vesting period | 3 years
U.S. Cellular | U.S. Cellular Long-Term Incentive Plans |
Stock-based compensation, overview |
Shares reserved | 12,867,000
U.S. Cellular | Non-Employee Directors' Plan |
Stock-based compensation, overview |
Shares reserved | 123,000
Retired Employees | U.S. Cellular Long-Term Incentive Plans | Stock Options | Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercisable term | 90 days
Retired Employees | U.S. Cellular Long-Term Incentive Plans | Stock Options | Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercisable term | 1 year
Terminated Employees | U.S. Cellular Long-Term Incentive Plans | Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Expiration period | 30 days

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