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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
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,
202020192018
Stock-based compensation expense:
Restricted stock$63 $64 $63 
Performance awards15 23 22 
Stock options and other awards2 2 1 
Total stock-based compensation expense$80 $89 $86 
Tax benefit recognized on stock-based compensation expense$13 $19 $18 
Tax benefit realized for tax deductions resulting from
exercises and vestings
1 17 32 
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, 20201,091,854 $93.38 
Granted1,126,483 55.62 
Vested(770,727)82.80 
Forfeited(9,698)93.73 
Nonvested shares as of December 31, 20201,437,912 69.47 
The following table reflects activity related to our restricted stock:
Year Ended December 31,
202020192018
Weighted-average grant-date fair value per share of
restricted stock granted
$55.62 $98.75 $92.12 
Fair value of restricted stock vested (in millions)35 74 80