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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
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,
202120202019
Stock-based compensation expense:
Restricted stock$65 $63 $64 
Performance awards21 15 23 
Stock options and other awards2 2 2 
Total stock-based compensation expense$88 $80 $89 
Tax benefit recognized on stock-based compensation expense$13 $13 $19 
Tax benefit realized for tax deductions resulting from
exercises and vestings
1 1 17 
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, 20211,437,912 $69.47 
Granted831,337 77.71 
Vested(797,751)75.36 
Forfeited(13,307)70.64 
Nonvested shares as of December 31, 20211,458,191 70.93 
The following table reflects activity related to our restricted stock:
Year Ended December 31,
202120202019
Weighted-average grant-date fair value per share of
restricted stock granted
$77.71 $55.62 $98.75 
Fair value of restricted stock vested (in millions)59 35 74