Capital Stock and Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2021

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 Outstanding	Treasury Stock
Balance, January 1, 2019	862,912,792	602,793,568
Common stock acquired	(17,219,642)	17,219,642
Shares issued for stock options	8,145,777	(8,145,777)
Shares issued for restricted stock units and other	862,852	(862,852)
Balance, December 31, 2019	854,701,779	611,004,581
Common stock acquired	(18,701,843)	18,701,843
Shares issued for stock options	13,018,354	(13,018,354)
Shares issued for restricted stock units and other	875,311	(875,311)
Balance, December 31, 2020	849,893,601	615,812,759
Common stock acquired	(16,518,163)	16,518,163
Shares issued for stock options	6,357,793	(6,357,793)
Shares issued for restricted stock units and other	747,053	(747,053)
Balance, December 31, 2021	840,480,284	625,226,076

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:

	2021		2020		2019
Expected term of options	6 years		6 years		6 years
Expected volatility rate	20.3	%	21.8	%	19.2	%
Risk-free interest rate	1.0	%	0.5	%	1.5	%
Expected dividend yield	2.3	%	2.3	%	2.3	%

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, 2021 is presented below:

	Shares (in thousands)	Weighted Average Grant Date Fair Value Per Award
Performance-based restricted stock units as of January 1, 2021	860	$	73
Activity:
Granted	355	70
Forfeited	(189)	81
Performance-based restricted stock units as of December 31, 2021	1,026	$	70

A summary of restricted stock unit activity during 2021 is presented below:

	Shares (in thousands)	Weighted Average Grant Date Fair Value Per Award
Restricted stock units as of January 1, 2021	1,897	$	73
Activity:
Granted	749	78
Vested	(674)	70
Forfeited	(56)	74
Restricted stock units as of December 31, 2021	1,916	$	76

Schedule of Share-based Compensation, Stock Options, Activity

A summary of stock option activity during 2021 is presented below:

	Shares (in thousands)	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Intrinsic Value of Unexercised In-the-Money Options
Options outstanding, January 1, 2021	27,530	$	71
Granted	5,120	77
Exercised	(6,358)	68
Forfeited	(173)	75
Expired	(24)	73
Options outstanding, December 31, 2021	26,095	72		5	$	309
Options exercisable, December 31, 2021	16,725	$	72	3	$	223