Note 3 - Stock Options and Other Stock Plans (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

Millions, for the Three Months Ended March 31,	2023		2022
Stock-based compensation, before tax:
Stock options	$	4	$	4
Retention awards		18		22
ESPP		6		4
Total stock-based compensation, before tax	$	28	$	30
Excess income tax benefits from equity compensation plans	$	6	$	17

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Weighted-Average Assumptions	2023			2022
Risk-free interest rate		3.9	%		1.6	%
Dividend yield		2.6	%		1.9	%
Expected life (years)		4.5			4.4
Volatility		29.3	%		28.7	%
Weighted-average grant-date fair value of options granted	$	48.31		$	51.92

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Options (thous.)		Weighted-Average Exercise Price			Weighted-Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (millions)
Outstanding at January 1, 2023		1,974		$	169.64		6.0		$	86
Granted		351			202.81		N/A			N/A
Exercised		(34	)		92.22		N/A			N/A
Forfeited or expired		(1	)		244.35		N/A			N/A
Outstanding at March 31, 2023		2,290		$	175.84		6.5		$	73
Vested or expected to vest at March 31, 2023		2,269		$	175.49		6.5		$	73
Options exercisable at March 31, 2023		1,617		$	159.16		5.4		$	73

Cash Proceeds Received and Tax Benefit from Share-Based Payment Awards [Table Text Block]

Millions, for the Three Months Ended March 31,	2023			2022
Intrinsic value of stock options exercised	$	4		$	42
Cash received from option exercises		4			15
Treasury shares repurchased for employee payroll taxes		(1	)		(5	)
Income tax benefit realized from option exercises		1			5
Aggregate grant-date fair value of stock options vested		14			13

Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

	Shares (thous.)		Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2023		1,069		$	196.47
Granted		289			202.81
Vested		(296	)		162.38
Forfeited		(13	)		202.85
Nonvested at March 31, 2023		1,049		$	207.76

Schedule of Nonvested Performance-Based Units Activity [Table Text Block]

	Shares (thous.)		Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2023		594		$	199.82
Granted		251			202.81
Vested		(72	)		186.11
Unearned		(127	)		186.11
Forfeited		-			-
Nonvested at March 31, 2023		646		$	205.21