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Stock-Based Compensation (Table) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Summary of nonvested restricted stock units | A summary of UScellular nonvested restricted stock units and changes during 2020 is presented in the table below:
Common Restricted Stock Units | Number |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2019 | 1,461,000 |  |  | $ | 40.90 |
Granted | 1,020,000 |  |  | $ | 29.18 |
Vested | (653,000) |  |  | $ | 35.54 |
Forfeited | (168,000) |  |  | $ | 34.81 |
Nonvested at December 31, 2020 | 1,660,000 |  |  | $ | 36.43 |
Summary of nonvested performance share units | A summary of UScellular's nonvested performance share units and changes during 2020 is presented in the table below:
Common Performance Share Units | Number |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2019 | 1,245,000 |  |  | $ | 40.16 |
Granted | 582,000 |  |  | $ | 29.71 |
Vested | (398,000) |  |  | $ | 36.92 |
Change in units based on approved performance factors | 20,000 |  |  | $ | 46.43 |
Forfeited | (144,000) |  |  | $ | 40.05 |
Nonvested at December 31, 2020 | 1,305,000 |  |  | $ | 36.60 |
Stock-based compensation | The following table summarizes stock‑based compensation expense recognized during 2020, 2019 and 2018:
Year Ended December 31, | 2020 |  | 2019 |  | 2018
(Dollars in millions) |  |  |  |  |
Stock option awards | $ | — |  |  | $ | — |  |  | $ | 2 |
Restricted stock unit awards | 21 |  |  | 22 |  |  | 21 |
Performance share unit awards | 10 |  |  | 18 |  |  | 13 |
Awards under Non-Employee Director compensation plan | 1 |  |  | 1 |  |  | 1 |
Total stock-based compensation expense, before income taxes | 32 |  |  | 41 |  |  | 37 |
Income tax benefit | (8) |  |  | (10) |  |  | (9) |
Total stock-based compensation expense, net of income taxes | $ | 24 |  |  | $ | 31 |  |  | $ | 28 |
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, | 2020 |  | 2019 |  | 2018
(Dollars in millions) |  |  |  |  |
Selling, general and administrative expense | $ | 28 |  |  | $ | 36 |  |  | $ | 33 |
System operations expense | 4 |  |  | 5 |  |  | 4 |
Total stock-based compensation expense | $ | 32 |  |  | $ | 41 |  |  | $ | 37 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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