Capital Stock and Stock-Based Compensation Plans - Summary of Common Stock and Treasury Stock Activity (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock Outstanding
Common stock balance, January 1 (in shares)	849,893,601	854,701,779	862,912,792
Common stock acquired (in shares)	16,518,163	18,701,843	17,219,642
Shares issued for stock options (in shares)	6,357,793	13,018,354	8,145,777
Shares issued for restricted stock and other (in shares)	747,053	875,311	862,852
Common stock balance, December 31 (in shares)	840,480,284	849,893,601	854,701,779
Treasury Stock
Treasury stock balance, January 1 (in shares)	615,812,759	611,004,581	602,793,568
Common stock acquired (in shares)	16,518,163	18,701,843	17,219,642
Shares issued for stock options (in shares)	6,357,793	13,018,354	8,145,777
Shares issued for restricted stock and other (in shares)	747,053	875,311	862,852
Treasury stock balance, December 31 (in shares)	625,226,076	615,812,759	611,004,581