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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Stock-based Compensation
The following table summarizes stock-based compensation expense for the years ended December 31, 2021, 2020 and 2019.
Year Ended December 31,202120202019
RSUs and PSUs$163 $167 $169 
Stock options 9 19 27 
Compensation cost included in operating and SG&A expense172 186 196 
Compensation cost included in restructuring and other
corporate matters (a)
20 88 90 
Stock-based compensation expense, before income taxes192 274 286 
Related tax benefit(41)(54)(58)
Stock-based compensation expense, net of tax benefit$151 $220 $228 
(a) Reflects accelerations as a result of restructuring activities, as well as accelerations triggered by the Merger in 2019.
Rollforward of RSU and PSU Activity
The following table summarizes our RSU and PSU share activity:
Weighted Average
SharesGrant Date Fair Value
Non-vested at December 31, 202014,000,630 $38.91 
Granted486,315 $35.80 
Vested(6,238,540)$40.94 
Forfeited (517,741)$37.91 
Non-vested at December 31, 20217,730,664 $37.14 
Rollforward of Stock Option Activity
The following table summarizes our stock option activity under the Plans.
Weighted Average
Stock OptionsExercise Price
Outstanding at December 31, 202014,140,724 $60.72 
Exercised(7,532,834)$55.19 
Forfeited or expired (405,315)$115.51 
Outstanding at December 31, 20216,202,575 $63.85 
Exercisable at December 31, 20215,700,778 $64.78 
Stock Option Exercise Information
The following table summarizes other information relating to stock option exercises during the years ended December 31, 2021, 2020 and 2019.
Year Ended December 31, 202120202019
Cash received from stock option exercises$408 $5 $15 
Tax benefit of stock option exercises$29 $1 $4 
Intrinsic value of stock option exercises$128 $2 $15