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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation
|  | Second Quarter |  | First Six Months
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | ($ in millions)
Stock-based compensation expense |  | $ | 16 |  |  | $ | 10 |  |  | $ | 32 |  |  | $ | 12 |
Total tax benefit |  | 8 |  |  | 3 |  |  | 25 |  |  | 29 |
During 2021, we granted stock options, restricted stock units (RSUs) and performance share units (PSUs) pursuant to the Long-Term Incentive Plan (LTIP), as follows:
|  | Second Quarter |  | First Six Months
|  | Granted |  | Weighted-Average Grant-Date Fair Value |  | Granted |  | Weighted-Average Grant-Date Fair Value
Stock options |  | — |  |  | $ | — |  |  | 42,770 |  |  | $ | 62.49 |
RSUs |  | 2,740 |  |  | 283.60 |  |  | 176,855 |  |  | 238.74 |
PSUs |  | 120 |  |  | 274.17 |  |  | 50,060 |  |  | 240.69 |
Stock Options
|  | Second Quarter |  | First Six Months
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | ($ in millions)
Options exercised |  | 128,934 |  | 162,400 |  |  | 341,480 |  |  | 685,638 |
Cash received upon exercise |  | $ | 12 |  |  | $ | 12 |  |  | $ | 31 |  |  | $ | 55 |
Related tax benefit realized |  | 5 |  |  | 3 |  |  | 12 |  |  | 16 |
Restricted Stock Units RSUs granted primarily have a four-year ratable restriction period and will be settled through the issuance of shares of Norfolk Southern common stock (Common Stock). Certain RSU grants include cash dividend equivalent payments during the restriction period in an amount equal to the regular quarterly dividends paid on Common Stock.
|  | Second Quarter |  | First Six Months
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | ($ in millions)
RSUs vested |  | 1,730 |  |  | — |  |  | 259,127 |  |  | 202,299 |
Common Stock issued net of tax withholding |  | 1,222 |  |  | — |  |  | 183,511 |  |  | 143,712 |
Related tax benefit realized |  | $ | — |  |  | $ | — |  |  | $ | 7 |  |  | $ | 4 |
Performance Share Units PSUs provide for awards based on the achievement of certain predetermined corporate performance goals at the end of a three-year cycle and are settled through the issuance of shares of Common Stock. All PSUs will earn out based on the achievement of performance conditions and some will also earn out based on a market condition. The market condition fair value was measured on the date of grant using a Monte Carlo simulation model. No PSUs were earned or paid out during the second quarters of 2021 or 2020.
|  | First Six Months
|  | 2021 |  | 2020
|  | ($ in millions)
PSUs earned |  | 78,727 |  |  | 235,935
Common Stock issued net of tax withholding |  | 49,967 |  |  | 156,450
Related tax benefit realized |  | $ | 1 |  |  | $ | 7 |

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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