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Note 4 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2024
Notes Tables  
Share-Based Payment Arrangement, Cost by Plan [Table Text Block]
   

Three Months Ended

   

Nine Months Ended

 
   

September 30,

   

September 30,

 

Millions

 

2024

   

2023

   

2024

   

2023

 

Stock-based compensation, before tax:

                               

Stock options

  $ 4     $ 4     $ 13     $ 12  

Retention awards

    23       24       58       57  

ESPP

    6       4       16       15  

Total stock-based compensation, before tax

  $ 33     $ 32     $ 87     $ 84  

Excess income tax benefits from equity compensation plans

  $ 3     $ 2     $ 13     $ 9  
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

    (306 )     147.67       N/A       N/A  

Forfeited or expired

    (45 )     230.75       N/A       N/A  

Outstanding at September 30, 2024

    2,026     $ 194.69       6.0     $ 106  

Vested or expected to vest at September 30, 2024

2,008     $ 194.38       6.0     $ 105  

Options exercisable at September 30, 2024

    1,434     $ 179.46       4.9     $ 96  
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

 

2024

   

2023

   

2024

   

2023

 

Intrinsic value of stock options exercised

  $ 15     $ 10     $ 31     $ 17  

Cash received from option exercises

    16       9       40       17  

Treasury shares repurchased for employee payroll taxes

    (2 )     (1 )     (7 )     (3 )

Income tax benefit realized from option exercises

    2       2       6       4  

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

    (245 )     186.67  

Forfeited

    (34 )     220.17  

Nonvested at September 30, 2024

    928     $ 222.19  
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

    (46 )     228.59  

Nonvested at September 30, 2024

    609     $ 219.17