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Note 4 - Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]

Millions, for the Three Months Ended March 31,

 

2023

   

2022

 

Service cost

  $ 13     $ 26  

Interest cost

    46       31  

Expected return on plan assets

    (62 )     (73 )

Amortization of actuarial loss

    2       22  

Net periodic pension (benefit)/cost

  $ (1 )   $ 6