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Stock-based Compensation
3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based Compensation 2) STOCK-BASED COMPENSATION
The following table summarizes the Company’s stock-based compensation expense for the three months ended March 31, 2019 and 2018.
 
Three Months Ended
 
March 31,
 
2019
 
2018
RSUs and PSUs
$
33

 
$
38

Stock options
6

 
6

Stock-based compensation expense, before income taxes
39

 
44

Related tax benefit
(9
)
 
(11
)
Stock-based compensation expense, net of tax benefit
$
30

 
$
33


During the three months ended March 31, 2019, the Company granted 3 million RSUs for CBS Corp. Class B Common Stock with a weighted average per unit grant-date fair value of $50.91. RSUs granted during the first quarter of 2019 generally vest over a one- to four-year service period. Compensation expense for RSUs is determined based upon the market price of the shares underlying the awards on the date of grant. For certain RSU awards the number of shares an employee earns ranges from 0% to 120% of the target award, based on the outcome of established performance conditions. Compensation expense is recorded based on the probable outcome of the performance conditions.

Total unrecognized compensation cost related to unvested RSUs at March 31, 2019 was $261 million, which is expected to be recognized over a weighted average period of 3.0 years. Total unrecognized compensation cost related to unvested stock option awards at March 31, 2019 was $24 million, which is expected to be recognized over a weighted average period of 2.3 years.