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Note 5 - Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 

Millions

 

2022

  

2021

  

2022

  

2021

 

Service cost

 $21  $25  $73  $85 

Interest cost

  31   25   93   78 

Expected return on plan assets

  (74)  (67)  (220)  (202)

Amortization of actuarial loss

  21   35   64   106 

Net periodic pension (benefit)/cost

 $(1) $18  $10  $67