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Note 3 - Operations and Segmentation (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
Millions, for the Three Months Ended March 31, |  | 2022 |  |  | 2021 |
Bulk |  | $ | 1,832 |  |  | $ | 1,512 |
Industrial |  |  | 1,921 |  |  |  | 1,656 |
Premium |  |  | 1,687 |  |  |  | 1,481 |
Total freight revenues |  | $ | 5,440 |  |  | $ | 4,649 |
Other subsidiary revenues |  |  | 205 |  |  |  | 177 |
Accessorial revenues |  |  | 201 |  |  |  | 161 |
Other |  |  | 14 |  |  |  | 14 |
Total operating revenues |  | $ | 5,860 |  |  | $ | 5,001 |

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