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

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 

Millions

 

2022

  

2021

  

2022

  

2021

 

Service cost

 $26  $30  $52  $60 

Interest cost

  31   27   62   53 

Expected return on plan assets

  (73)  (68)  (146)  (135)

Amortization of actuarial loss

  21   35   43   71 

Net periodic pension cost

 $5  $24  $11  $49