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Stock Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Nonvested Incentive/Performance Unit Awards and Restricted Share/Restricted Share Unit Awards - Rollforward A rollforward of the nonvested incentive/performance share unit and restricted share unit awards follows:
Table 102: Nonvested Incentive/Performance Share Unit Awards and Restricted Share Unit Awards - Rollforward
Shares in thousandsNonvested Incentive/Performance Units SharesWeighted-Average Grant Date Fair ValueNonvested Restricted Share UnitsWeighted-Average Grant Date Fair Value
December 31, 2019844 $116.00 3,305 $128.29 
Granted (a)183 $147.60 1,268 $150.61 
Vested/Released (a)(363)$106.17 (1,053)$123.58 
Forfeitures (63)$138.41 
December 31, 2020664 $130.08 3,457 $137.73 
(a)Includes adjustments for achieving specific performance goals for Incentive/Performance Unit Share Awards granted in prior periods.