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

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 

Millions

 

2023

  

2022

  

2023

  

2022

 

Bulk

 $1,757  $1,813  $3,654  $3,645 

Industrial

  2,086   2,091   4,103   4,012 

Premium

  1,726   1,938   3,468   3,625 

Total freight revenues

 $5,569  $5,842  $11,225  $11,282 

Other subsidiary revenues

  220   233   455   438 

Accessorial revenues

  149   183   300   384 

Other

  25   11   39   25 

Total operating revenues

 $5,963  $6,269  $12,019  $12,129