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Capital Stock and Stock-Based Compensation Plans - Summary of Common Stock and Treasury Stock Activity (Details) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common Stock Outstanding      
Common stock balance, January 1 (in shares) 854,701,779 862,912,792 874,701,118
Common stock acquired (in shares) 18,701,843 17,219,642 18,786,897
Shares issued for stock options (in shares) 13,018,354 8,145,777 6,040,920
Shares issued for restricted stock and other (in shares) 875,311 862,852 957,651
Common stock balance, December 31 (in shares) 849,893,601 854,701,779 862,912,792
Treasury Stock      
Treasury stock balance, January 1 (in shares) 611,004,581 602,793,568 591,005,242
Common stock acquired (in shares) 18,701,843 17,219,642 18,786,897
Shares issued for stock options (in shares) 13,018,354 8,145,777 6,040,920
Shares issued for restricted stock and other (in shares) 875,311 862,852 957,651
Treasury stock balance, December 31 (in shares) 615,812,759 611,004,581 602,793,568