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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The following table presents a summary of 2021 activity for RSUs and PSUs.
Table 13.1: Summary of Restricted Stock Units and Performance Share Units
Restricted Stock Units
Performance Share Units(1)
(Shares/units in thousands)Units Weighted-Average
Grant Date
Fair Value
per Unit		UnitsWeighted-Average
Grant Date
Fair Value
per Unit
Unvested as of January 1, 20213,833 $86.14 1,761 $96.15 
Granted(2)
2,123 127.37 873 112.51 
Vested(1,600)90.69 (760)98.74 
Forfeited(246)105.83 (109)101.02 
Unvested as of December 31, 20214,110 $104.50 1,765 $102.84 
_________
(1)Granted and vested include adjustments for achievement of specific performance goals for performance share units granted in prior periods.
(2)The weighted-average grant date fair value of RSUs was $92.04 and $83.29 in 2020 and 2019, respectively. The weighted-average grant date fair value of PSUs was $100.04 and $78.18 in 2020 and 2019, respectively.
Summary of Stock Option Activity
The following table presents a summary of 2021 activity for stock options and the balance of stock options exercisable as of December 31, 2021.
Table 13.2: Summary of Stock Options Activity
(Shares in thousands, and intrinsic value in millions)Shares
Subject to
Options		Weighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Outstanding as of January 1, 20211,793 $63.91 
Granted0 0.00 
Exercised(918)60.09 
Forfeited0 0.00 
Expired0 0.00 
Outstanding and Exercisable as of December 31, 2021
875 $67.92 2.76 years$67