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Note 2 - Operations and Segmentation (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Disaggregation of Revenue [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 

Millions

 

2023

  

2022

  

2023

  

2022

 

Bulk

 $1,766  $1,959  $5,420  $5,604 

Industrial

  2,057   2,194   6,160   6,206 

Premium

  1,722   1,956   5,190   5,581 

Total freight revenues

 $5,545  $6,109  $16,770  $17,391 

Other subsidiary revenues

  226   231   681   669 

Accessorial revenues

  142   212   442   596 

Other

  28   14   67   39 

Total operating revenues

 $5,941  $6,566  $17,960  $18,695