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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
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,
202320222021
Stock-based compensation expense:
Restricted stock$66 $67 $65 
Performance awards38 32 21 
Stock options and other awards3 4 2 
Total stock-based compensation expense$107 $103 $88 
Tax benefit recognized on stock-based compensation expense$14 $15 $13 
Tax benefit realized for tax deductions resulting from
exercises and vestings
2 2 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, 20231,182,177 $87.36 
Granted518,092 125.57 
Vested(786,920)84.12 
Forfeited(10,503)95.04 
Nonvested shares as of December 31, 2023902,846 112.01 
The following table reflects activity related to our restricted stock:
Year Ended December 31,
202320222021
Weighted-average grant-date fair value per share of
restricted stock granted
$125.57 $112.88 $77.71 
Fair value of restricted stock vested (in millions)99 99 59