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Stock Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Nonvested Performance Share Unit Awards and Restricted Share Unit Awards - Rollforward A rollforward of the nonvested performance share unit and restricted share unit awards follows:
Table 107: Nonvested Performance Share Unit Awards and Restricted Share Unit Awards - Rollforward
Shares in thousandsNonvested Performance Share UnitsWeighted-Average Grant Date Fair ValueNonvested Restricted Share UnitsWeighted-Average Grant Date Fair Value
December 31, 2020664 $130.08 3,457 $137.73 
Granted (a)169 $158.76 1,267 $161.34 
Vested/Released (a)(234)$141.82 (1,030)$147.92 
Forfeitures (112)$144.87 
December 31, 2021599 $133.59 3,582 $142.94 
(a)Includes adjustments for achieving specific performance goals for Performance Share Unit Awards granted in prior periods.