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Note 4 - Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  Three Months Ended  Nine Months Ended 
  September 30,  September 30, 

Millions

 

2023

  

2022

  

2023

  

2022

 

Service cost

 $13  $21  $38  $73 

Interest cost

  48   31   140   93 

Expected return on plan assets

  (62)  (74)  (186)  (220)

Amortization of actuarial loss

  2   21   6   64 

Net periodic pension (benefit)/cost

 $1  $(1) $(2) $10