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Stock-Based Compensation (Table) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Summary of stock options | A summary of U.S. Cellular stock options outstanding (total and portion exercisable) and changes during 2019 is presented in the table below:
Common Share Options | Number of Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in millions) |  | Weighted Average Remaining Contractual Life (in years)
Outstanding at December 31, 2018 | 806,000 |  |  | $ | 43.10 |  |  |  |  |
(420,000 exercisable) |  |  | $ | 42.39 |  |  |  |  |
Exercised | (339,000 | ) |  | $ | 44.27 |  |  |  |  |
Expired | (7,000 | ) |  | $ | 45.87 |  |  |  |  |
Outstanding at December 31, 2019 | 460,000 |  |  | $ | 42.20 |  |  | $ | — |  |  | 4.9
(460,000 exercisable) |  |  | $ | 42.20 |  |  | $ | — |  |  | 4.9
Summary of nonvested restricted stock units | A summary of U.S. Cellular nonvested restricted stock units at December 31, 2019, and changes during the year then ended is presented in the table below:
Common Restricted Stock Units | Number |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2018 | 1,569,000 |  |  | $ | 39.74 |
Granted | 478,000 |  |  | $ | 46.81 |
Vested | (525,000 | ) |  | $ | 42.99 |
Forfeited | (61,000 | ) |  | $ | 39.38 |
Nonvested at December 31, 2019 | 1,461,000 |  |  | $ | 40.90 |
Summary of nonvested performance share units | A summary of U.S. Cellular’s nonvested performance share units and changes during 2019 is presented in the table below:
Common Performance Share Units | Number |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2018 | 768,000 |  |  | $ | 37.78 |
Granted | 323,000 |  |  | $ | 46.43 |
Vested | (5,000 | ) |  | $ | 37.92 |
Change in units based on approved performance factors | 188,000 |  |  | $ | 38.81 |
Forfeited | (29,000 | ) |  | $ | 38.55 |
Nonvested at December 31, 2019 | 1,245,000 |  |  | $ | 40.16 |
Stock-based compensation | The following table summarizes stock‑based compensation expense recognized during 2019, 2018 and 2017:
Year Ended December 31, | 2019 |  | 2018 |  | 2017
(Dollars in millions) |  |  |  |  |
Stock option awards | $ | — |  |  | $ | 2 |  |  | $ | 6 |
Restricted stock unit awards | 22 |  |  | 21 |  |  | 19 |
Performance share unit awards | 18 |  |  | 13 |  |  | 4 |
Awards under Non-Employee Director compensation plan | 1 |  |  | 1 |  |  | 1 |
Total stock-based compensation expense, before income taxes | 41 |  |  | 37 |  |  | 30 |
Income tax benefit | (10 | ) |  | (9 | ) |  | (11 | )
Total stock-based compensation expense, net of income taxes | $ | 31 |  |  | $ | 28 |  |  | $ | 19 |
Stock-based compensation, allocation by financial statement line item | The following table provides a summary of the classification of stock-based compensation expense included in the Consolidated Statement of Operations for the years ended:
December 31, | 2019 |  | 2018 |  | 2017
(Dollars in millions) |  |  |  |  |
Selling, general and administrative expense | $ | 36 |  |  | $ | 33 |  |  | $ | 27 |
System operations expense | 5 |  |  | 4 |  |  | 3 |
Total stock-based compensation expense | $ | 41 |  |  | $ | 37 |  |  | $ | 30 |

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