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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Assumptions Used in Options Pricing Model The assumptions pertaining to options issued during 2021, 2020, and 2019 are shown in the following table.
Year ended December 31,202120202019
Average option life6.6 years6.5 years6.5 years
Future dividend yield3.88 %3.90 %3.88 %
Historical share price volatility.335 .267 .266 
Weighted-average risk-free interest rate0.8 %1.3 %2.5 %
Activity, Pricing and Other Information for Stock Options
The following table summarizes activity, pricing and other information for our stock options for the year ended December 31, 2021:
Number of
Options
Weighted-Average
Exercise Price Per
Option
Weighted-Average
Remaining Life (in years)
Aggregate
Intrinsic
Value(a)
Outstanding at December 31, 20206,372,684 $14.18 4.6$21 
Granted542,153 20.98 
Exercised(2,319,438)11.71 
Lapsed or canceled(7,767)18.96 
Outstanding at December 31, 20214,587,632 $16.23 5.1$32 
Expected to vest1,280,416 19.53 7.75 
Exercisable at December 31, 20213,223,629 $14.81 3.9$27 
(a)The intrinsic value of a stock option is the amount by which the fair value of the underlying stock exceeds the exercise price of the option.
Activity and Pricing Information for Nonvested Shares in Long-Term Incentive Compensation Program
The following table summarizes activity and pricing information for the nonvested shares in the Program for the year ended December 31, 2021.
 
Vesting Contingent on
Service Conditions
Vesting Contingent on
Performance and Service
Conditions - Payable in Stock
Vesting Contingent on
Performance and Service
Conditions - Payable in Cash
  
Number of
Nonvested
Shares
Weighted-
Average
Grant-Date
Fair Value
Number of
Nonvested
Shares
Weighted-
Average
Grant-Date
Fair Value
Number of
Nonvested
Shares		Weighted-
Average
Grant-Date
Fair Value
Outstanding at December 31, 202011,516,370 $19.01 59,171 $18.20 4,780,039 $16.23 
Granted5,115,781 19.07 29,215 19.07 1,626,607 23.19 
Vested(4,299,104)19.11 — — (1,278,629)18.18 
Forfeited(332,663)19.07 — — (47,494)22.19 
Outstanding at December 31, 202112,000,384 $19.00 88,386 $18.47 5,080,523 $23.18 
Activity and Pricing Information for Nonvested Shares Granted Under Deferred Compensation Plans and Other Restricted Stock Awards
The following table summarizes activity and pricing information for the nonvested shares granted under our deferred compensation plans and these other restricted stock or unit award programs for the year ended December 31, 2021.
Number of
Nonvested
Shares
Weighted-Average
Grant-Date
Fair Value
Outstanding at December 31, 20202,572,087 $17.46 
Granted1,307,094 21.25 
Vested(891,388)17.93 
Forfeited(38,836)20.20 
Outstanding at December 31, 20212,948,957 $18.65