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Stock-Based Compensation - TDS excluding U.S. Cellular, Nonvested shares and other stock compensation disclosures (Details) - TDS Parent Company - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Performance Share Units | Minimum |  |  |
Shares issued and granted under stock compensation plans |  |  |
Performance share awards target | 0.00% |  |
Performance Share Units | Maximum |  |  |
Shares issued and granted under stock compensation plans |  |  |
Performance share awards target | 200.00% |  |
Common Shares | Non-Employee Directors' Plan |  |  |
Shares issued and granted under stock compensation plans |  |  |
Shares issued | 28,000 | 32,000 | 27,000
Shares reserved | 225,000 |  |
Common Shares | TDS Long-Term Incentive Plans |  |  |
Shares issued and granted under stock compensation plans |  |  |
Award vesting period | 3 years |  |
Shares reserved | 12,475,000 |  |
Common Shares | Automatic Dividend Reinvestment and Stock Purchase Plans |  |  |
Shares issued and granted under stock compensation plans |  |  |
Shares reserved | 464,000 |  |
Purchase price, percent | 95.00% |  |
Common Shares | Restricted Stock Units |  |  |
Stock based compensation, Nonvested shares rollforward, number of shares |  |  |
Nonvested stock units, beginning of period - Number of shares (in shares) | 1,212,000 |  |
Granted number of shares (in shares) | 425,000 |  |
Vested number of shares (in shares) | (355,000) |  |
Forfeited number of shares (in shares) | (49,000) |  |
Nonvested stock units, end of period - Number of shares (in shares) | 1,233,000 | 1,212,000 |
Stock based compensation, Nonvested shares weighted average grant date fair value |  |  |
Nonvested stock units - beginning of period weighted average grant date fair value (USD per share) | $ 25.73 |  |
Granted weighted average grant date fair value (USD per share) | 28.81 | $ 23.87 | $ 25.97
Vested weighted average grant date fair value (USD per share) | 27.87 |  |
Forfeited weighted average grant date fair value (USD per share) | 26.11 |  |
Nonvested stock units - end of period weighted average grant date fair value (USD per share) | $ 26.16 | $ 25.73 |
Shares issued and granted under stock compensation plans |  |  |
Fair value of vested stock units | $ 11,000,000 | $ 9,000,000 | $ 9,000,000
Common Shares | Performance Share Units |  |  |
Stock based compensation, Nonvested shares rollforward, number of shares |  |  |
Nonvested stock units, beginning of period - Number of shares (in shares) | 350,000 |  |
Granted number of shares (in shares) | 229,000 |  |
Vested number of shares (in shares) | (99,000) |  |
Change in units based on approved performance factors (in shares) | 6,000 |  |
Forfeited number of shares (in shares) | (7,000) |  |
Accumulated dividend equivalents (in shares) | 10,000 |  |
Nonvested stock units, end of period - Number of shares (in shares) | 489,000 | 350,000 |
Stock based compensation, Nonvested shares weighted average grant date fair value |  |  |
Nonvested stock units - beginning of period weighted average grant date fair value (USD per share) | $ 27.38 |  |
Granted weighted average grant date fair value (USD per share) | 30.72 | $ 25.70 | $ 27.79
Vested weighted average grant date fair value (USD per share) | (29.45) |  |
Change in units based on approved performance factors weighted average grant date fair value (USD per share) | 29.45 |  |
Forfeited weighted average grant date fair value (USD per share) | 30.33 |  |
Accumulated dividend equivalents, weighted average grant date fair value (USD per share) | 28.26 |  |
Nonvested stock units - end of period weighted average grant date fair value (USD per share) | $ 28.53 | $ 27.38 |
Shares issued and granted under stock compensation plans |  |  |
Fair value of vested stock units | $ 4,000,000 | $ 0 | $ 0
Performance period | 3 years |  |
Common Shares | Deferred Compensation Stock Units |  |  |
Shares issued and granted under stock compensation plans |  |  |
Percent of match up to 50% from annual bonus | 25.00% |  |
Percent of match above 50% from annual bonus | 33.00% |  |
Award vesting period | 3 years |  |
Weighted average grant date fair value (USD per share) | $ 31.05 | $ 28.96 | $ 27.13
Vested number of shares, unissued | 96,000 |  |
Vested number of shares, unissued, fair value | $ 2,000,000 |  |
Common Shares | Deferred Compensation Stock Units | Maximum |  |  |
Shares issued and granted under stock compensation plans |  |  |
Fair value of vested stock units | $ 1,000,000 | $ 1,000,000 | $ 1,000,000
Series A Common Shares | Series A Common Share Automatic Dividend Reinvestment Plan |  |  |
Shares issued and granted under stock compensation plans |  |  |
Shares reserved | 183,000 |  |
Purchase price, percent | 95.00% |  |

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