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Stock-Based Compensation
6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
Second QuarterFirst Six Months
2022202120222021
($ in millions)
Stock-based compensation expense$13 $16 $36 $32 
Total tax benefit17 25 

During 2022, we granted stock options, restricted stock units (RSUs) and performance share units (PSUs) pursuant to the Long-Term Incentive Plan (LTIP), as follows:

Second QuarterFirst Six Months
GrantedWeighted-Average Grant-Date Fair ValueGrantedWeighted-Average Grant-Date Fair Value
Stock options1,640 $84.01 133,810 $60.69 
RSUs9,090 265.31 163,991 268.31 
PSUs2,430 271.83 51,455 274.70 
Stock Options
Second QuarterFirst Six Months
2022202120222021
($ in millions)
Options exercised39,546128,934 158,889 341,480 
Cash received upon exercise$$12 $14 $31 
Related tax benefits realized12 

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 QuarterFirst Six Months
2022202120222021
($ in millions)
RSUs vested3,652 1,730 246,953 259,127 
Common Stock issued net of tax withholding2,612 1,222 174,976 183,511 
Related tax benefits realized$— $— $$

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 2022 or 2021.

First Six Months
20222021
($ in millions)
PSUs earned86,420 78,727 
Common Stock issued net of tax withholding54,651 49,967 
Related tax benefits realized$$