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Note 3 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

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

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
Millions		2023				2022				2023				2022
Stock-based compensation, before tax:
Stock options		$	4			$	4			$	12			$	11
Retention awards			24				13				57				54
ESPP			4				4				15				12
Total stock-based compensation, before tax		$	32			$	21			$	84			$	77
Excess income tax benefits from equity compensation plans		$	2			$	2			$	9			$	20

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			(165	)			113.97				N/A				N/A
Forfeited or expired			(12	)			219.18				N/A				N/A
Outstanding at September 30, 2023			2,148			$	179.06				6.1			$	66
Vested or expected to vest at September 30, 2023			2,128			$	178.73				6.1			$	66
Options exercisable at September 30, 2023			1,492			$	162.93				5.0			$	65

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

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
Millions		2023				2022				2023				2022
Intrinsic value of stock options exercised		$	10			$	7			$	17			$	51
Cash received from option exercises			9				7				17				24
Treasury shares repurchased for employee payroll taxes			(1	)			(2	)			(3	)			(7	)
Income tax benefit realized from option exercises			2				1				4				7
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			296				202.83
Vested			(305	)			163.27
Forfeited			(39	)			205.35
Nonvested at September 30, 2023			1,021			$	207.89

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			(78	)			189.24
Unearned			(127	)			186.11
Forfeited			(13	)			220.23
Nonvested at September 30, 2023			627			$	204.69

X

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