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Note 1 - Nature of Operations (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
Millions |  | 2021 |  |  | 2020 |  |  | 2019 |
Bulk |  | $ | 6,656 |  |  | $ | 5,960 |  |  | $ | 6,529 |
Industrial |  |  | 7,323 |  |  |  | 6,622 |  |  |  | 7,472 |
Premium |  |  | 6,265 |  |  |  | 5,669 |  |  |  | 6,242 |
Total freight revenues |  | $ | 20,244 |  |  | $ | 18,251 |  |  | $ | 20,243 |
Other subsidiary revenues |  |  | 741 |  |  |  | 743 |  |  |  | 880 |
Accessorial revenues |  |  | 752 |  |  |  | 473 |  |  |  | 514 |
Other |  |  | 67 |  |  |  | 66 |  |  |  | 71 |
Total operating revenues |  | $ | 21,804 |  |  | $ | 19,533 |  |  | $ | 21,708 |

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