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Note 5 - Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]

Millions, for the Three Months Ended March 31,

 

2022

   

2021

 

Service cost

  $ 26     $ 30  

Interest cost

    31       26  

Expected return on plan assets

    (73 )     (67 )

Amortization of actuarial loss

    22       36  

Net periodic pension cost

  $ 6     $ 25