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Note 4 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2024

Notes Tables

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

	Three Months Ended									Six Months Ended
		June 30,								June 30,
Millions		2024				2023				2024				2023
Stock-based compensation, before tax:
Stock options		$	5			$	4			$	9			$	8
Retention awards			18				15				35				33
ESPP			5				5				10				11
Total stock-based compensation, before tax		$	28			$	24			$	54			$	52
Excess income tax benefits from equity compensation plans		$	1			$	1			$	10			$	7

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

Weighted-Average Assumptions		2024				2023
Risk-free interest rate			4.2	%			3.9	%
Dividend yield			2.1	%			2.6	%
Expected life (years)			4.4				4.5
Volatility			28.7	%			29.3	%
Weighted-average grant-date fair value of options granted		$	61.75			$	48.31

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

	Options (thous.)			Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Term (in yrs.)				Aggregate Intrinsic Value (millions)
Outstanding at January 1, 2024			2,072			$	180.56				5.9			$	135
Granted			305				248.82				N/A				N/A
Exercised			(152	)			139.36				N/A				N/A
Forfeited or expired			(19	)			228.80				N/A				N/A
Outstanding at June 30, 2024			2,206			$	192.42				6.1			$	87
Vested or expected to vest at June 30, 2024			2,188			$	192.10				6.1			$	87
Options exercisable at June 30, 2024			1,591			$	177.29				5.0			$	82

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

		Three Months Ended								Six Months Ended
		June 30,								June 30,
Millions		2024				2023				2024				2023
Intrinsic value of stock options exercised		$	4			$	3			$	16			$	7
Cash received from option exercises			9				4				24				8
Treasury shares repurchased for employee payroll taxes			(1	)			(1	)			(5	)			(2	)
Income tax benefit realized from option exercises			1				1				4				2
Aggregate grant-date fair value of stock options vested			-				-				15				14

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, 2024			996			$	207.76
Granted			211				248.75
Vested			(243	)			186.53
Forfeited			(26	)			219.25
Nonvested at June 30, 2024			938			$	222.16

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

		Shares (thous.)				Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2024			617			$	204.50
Granted			227				248.82
Vested			(119	)			204.67
Unearned			(70	)			204.45
Forfeited			(21	)			227.05
Nonvested at June 30, 2024			634			$	219.60

X

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Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options.

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