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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of stock-based compensation expense and tax benefits
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 
Summary of restricted stock awards 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 
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