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Capital Stock and Stock-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule Of Common And Treasury Stock Activity
A summary of common stock and treasury stock activity for the three years ended December 31 is as follows:
  Common Stock OutstandingTreasury Stock
Balance, January 1, 2018874,701,118 591,005,242 
Common stock acquired(18,786,897)18,786,897 
Shares issued for stock options6,040,920 (6,040,920)
Shares issued for restricted stock units and other957,651 (957,651)
Balance, December 31, 2018862,912,792 602,793,568 
Common stock acquired(17,219,642)17,219,642 
Shares issued for stock options8,145,777 (8,145,777)
Shares issued for restricted stock units and other862,852 (862,852)
Balance, December 31, 2019854,701,779 611,004,581 
Common stock acquired(18,701,843)18,701,843 
Shares issued for stock options13,018,354 (13,018,354)
Shares issued for restricted stock units and other875,311 (875,311)
Balance, December 31, 2020849,893,601 615,812,759 
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions Fair value is estimated using the Black-Scholes option pricing model with the assumptions summarized in the following table:
  202020192018
Expected term of options6 years6 years4.5 years
Expected volatility rate21.8 %19.2 %17.7 %
Risk-free interest rate0.5 %1.5 %2.8 %
Expected dividend yield2.3 %2.3 %2.5 %
Schedule of Share-based Compensation, Performance Restricted Stock and Time-based Restricted Stock Units Activity
A summary of performance-based restricted stock unit activity for the year ended December 31, 2020 is presented below:

  Shares
(in thousands)
Weighted Average Grant Date Fair Value Per Award
Performance-based restricted stock units as of January 1, 2020346 $67 
Activity:
Granted557 76 
Forfeited(38)69 
Performance-based restricted stock units as of December 31, 2020865 $73 
A summary of restricted stock unit activity during 2020 is presented below:
  Shares
(in thousands)
Weighted Average Grant Date Fair Value Per Award
Restricted stock units as of January 1, 20202,203 $71 
Activity:
Granted727 77 
Vested(1,130)74 
Forfeited(63)71 
Restricted stock units as of December 31, 20201,737 $73 
Schedule of Share-based Compensation, Stock Options, Activity
A summary of stock option activity during 2020 is presented below:
  Shares
(in thousands)
Weighted Average Exercise PriceWeighted Average Remaining Contractual Life
(in years)
Intrinsic Value of Unexercised
In-the-Money Options
Options outstanding, January 1, 202036,185 $69 
Granted4,976 76   
Exercised(13,019)67   
Forfeited or expired(601)72   
Options outstanding, December 31, 202027,541 72 4$386 
Options exercisable, December 31, 202018,084 $70 3$274