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Stock-Based Compensation
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
We issue stock-based incentive awards to our eligible employees under the 2019 Employee Stock Incentive Plan and to our eligible non-employee Directors under a Director Deferred Stock Ownership Plan. No further awards may be granted under the 2002 Employee Stock Incentive Plan (the “2002 Plan”), although awards granted under the 2002 Plan prior to the adoption of the new 2019 Plan in June of 2019 remain outstanding in accordance with their terms.
•2019 Employee Stock Incentive Plan (the “2019 Plan”) – The 2019 Plan permits the granting of incentive stock options, nonqualified stock options, stock appreciation rights, performance stock, restricted stock and other stock-based awards.
•Director Deferred Stock Ownership Plan – Under this plan, common stock reserved may be credited to deferred stock accounts for eligible Directors. In general, the plan requires that 50% of eligible Directors’ annual compensation plus dividend equivalents be credited to deferred stock accounts. Each Director may also elect to defer all or a portion of the remaining compensation and have an equivalent number of shares credited to the deferred stock account. Recipients under this plan are not required to provide consideration to us other than rendering service. Shares will be delivered as of the date a recipient ceases to be a member of the Board of Directors or within five years thereafter, if so elected. The plan will remain in effect until terminated by the Board of Directors or until no shares of stock remain available under the plan.

The number of common shares reserved for issuance are as follows: 
(in millions)December 31,
20212020
Shares available for granting 1
19.519.7
Options outstanding0.30.5
Total shares reserved for issuance 2
19.820.2
1     Shares available for granting at December 31, 2021 and 2020 are under the 2019 Plan.
2     Shares reserved for issuance under the Director Deferred Stock Ownership Plan are not included in the total, but are less than 1.0 million at both December 31, 2021 and 2020.

We issue treasury shares upon exercise of stock options and the issuance of restricted stock and unit awards. To offset the dilutive effect of the exercise of employee stock options, we periodically repurchase shares. See Note 9 – Equity for further discussion.
Stock-based compensation expense and the corresponding tax benefit are as follows: 
(in millions)Year Ended December 31,
 202120202019
Stock option expense$— $— $1 
Restricted stock and unit awards expense 122 90 77 
Total stock-based compensation expense$122 $90 $78 
Tax benefit$20 $15 $13 

Stock Options

Stock options may not be granted at a price less than the fair market value of our common stock on the date of grant. Stock options granted vest over a four year service period and have a maximum term of 10 years. Stock option compensation costs are recognized from the date of grant, utilizing a four-year graded vesting method. Under this method, more than half of the costs are recognized over the first twelve months, approximately one-quarter of the costs are recognized over a twenty-four month period starting from the date of grant, approximately one-tenth of the costs are recognized over a thirty-six month period starting from the date of grant, and the remaining costs recognized over a forty-eight month period starting from the date of grant.

There were no stock options granted in 2021, 2020, and 2019.

Stock option activity is as follows: 
(in millions, except per award amounts)SharesWeighted average exercise priceWeighted-average remaining years of contractual termAggregate intrinsic value
Options outstanding as of December 31, 2020
0.5 $60.46 
Exercised(0.2)$283.56 
Forfeited and expired 1
— $39.94 
Options outstanding as of December 31, 2021
0.3 $67.14 1.99$113 
Options exercisable as of December 31, 2021
0.3 $67.14 1.99$113 
1 There are less than 0.1 million shares forfeited and expired.

(in millions, except per award amounts)SharesWeighted-average grant-date fair value
Nonvested options outstanding as of December 31, 2020
— $111.96 
Vested 1
— $111.96 
Nonvested options outstanding as of December 31, 2021 2
— $— 
Total unrecognized compensation expense related to nonvested options$— 
Weighted-average years to be recognized over0.0
1There are less than 0.1 million shares vested.
2There are no nonvested options outstanding as of December 31, 2021.

The total fair value of our stock options that vested during the years ended December 31, 2021, 2020 and 2019 was less than $1 million, $2 million and $3 million, respectively.
Information regarding our stock option exercises is as follows: 
(in millions)Year Ended December 31,
 202120202019
Net cash proceeds from the exercise of stock options$13 $16 $40 
Total intrinsic value of stock option exercises$41 $60 $110 
Income tax benefit realized from stock option exercises$11 $13 $33 

Restricted Stock and Unit Awards

Restricted stock and unit awards (performance and non-performance) have been granted under the 2002 Plan and 2019 Plan. Performance unit awards will vest only if we achieve certain financial goals over the performance period. Restricted stock non-performance awards have various vesting periods (generally three years), with vesting beginning on the first anniversary of the awards. Recipients of restricted stock and unit awards are not required to provide consideration to us other than rendering service.

The stock-based compensation expense for restricted stock and unit awards is determined based on the market price of our stock at the grant date of the award applied to the total number of awards that are anticipated to fully vest. For performance unit awards, adjustments are made to expense dependent upon financial goals achieved.

Restricted stock and unit activity for performance and non-performance awards is as follows: 
(in millions, except per award amounts)SharesWeighted-average grant-date fair value
Nonvested shares as of December 31, 2020
0.6 $227.67 
Granted 0.4 $296.49 
Vested(0.5)$219.85 
Forfeited— $263.18 
Nonvested shares as of December 31, 2021
0.5 $299.28 
Total unrecognized compensation expense related to nonvested awards$101 
Weighted-average years to be recognized over1.7

 Year Ended December 31,
 202120202019
Weighted-average grant-date fair value per award$296.49 $232.92 $187.40 
Total fair value of restricted stock and unit awards vested$243 $134 $153 
Tax benefit relating to restricted stock activity$48 $26 $29