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Stock-Based Compensation
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION
13.    STOCK-BASED COMPENSATION

Overview
Under our 2020 Omnibus Stock Incentive Plan (the 2020 OSIP), various stock and stock-based awards may be granted to employees, non-employee directors, and third-party service providers. The 2020 OSIP permits grants of (i) restricted stock and restricted stock units; (ii) stock options (including incentive and non-qualified stock options); (iii) stock appreciation rights; (iv) performance awards of cash, stock, or other securities; and (v) other stock-based awards (e.g., stock unit awards). Awards under the 2020 OSIP are granted at the discretion of our Human Resources and Compensation Committee, a committee of our Board, and may be subject to vesting or performance periods, performance goals, or other restrictions. The 2020 OSIP was approved by our stockholders on April 30, 2020, and as of such date, any shares of common stock that were available to be awarded under the 2011 Omnibus Stock Incentive Plan (the 2011 OSIP) became available for issuance under the 2020 OSIP and any shares of common stock subject to awards under the 2011 OSIP outstanding as of April 30, 2020, that are subsequently forfeited, terminated, canceled or rescinded, settled in cash in lieu of common stock, exchanged for awards not involving common stock, or expire unexercised also become available for issuance under the 2020 OSIP. No future awards will be made under the 2011 OSIP. As of December 31, 2022, 12,747,181 shares of our common stock remained available to be awarded under the 2020 OSIP.

The following table reflects activity related to our stock-based compensation arrangements (in millions):
Year Ended December 31,
202220212020
Stock-based compensation expense:
Restricted stock$67 $65 $63 
Performance awards32 21 15 
Stock options and other awards4 2 2 
Total stock-based compensation expense$103 $88 $80 
Tax benefit recognized on stock-based compensation expense$15 $13 $13 
Tax benefit realized for tax deductions resulting from
exercises and vestings
2 1 1 
Restricted Stock
Restricted stock is our most significant stock-based compensation arrangement. Employees, non-employee directors, and third-party service providers are eligible to receive restricted stock, which vests in accordance with individual written agreements between the participants and us, usually in equal annual installments over a period of three years beginning one year after the date of grant. The fair value of each share of restricted stock is equal to the market price of our common stock. A summary of the status of our restricted stock awards is presented in the following table:





Number of
Shares
Weighted-
Average
Grant-Date
Fair Value
Per Share
Nonvested shares as of January 1, 20221,458,191 $70.93 
Granted575,074 112.88 
Vested(835,828)76.54 
Forfeited(15,260)72.52 
Nonvested shares as of December 31, 20221,182,177 87.36 

As of December 31, 2022, there was $54 million of unrecognized compensation cost related to outstanding unvested restricted stock awards, which is expected to be recognized over a weighted-average period of approximately two years.

The following table reflects activity related to our restricted stock:
Year Ended December 31,
202220212020
Weighted-average grant-date fair value per share of
restricted stock granted
$112.88 $77.71 $55.62 
Fair value of restricted stock vested (in millions)99 59 35