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Note 5 - Retirement Plans (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
 

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 

Millions

 

2024

  

2023

  

2024

  

2023

 

Service cost

 $14  $12  $27  $25 

Interest cost

  46   46   92   92 

Expected return on plan assets

  (63)  (62)  (126)  (124)

Amortization of actuarial loss

  2   2   4   4 

Net periodic pension (benefit)/cost

 $(1) $(2) $(3) $(3)