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Note 15 - Commitments and Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Schedule of Loss Contingencies by Contingency, Environmental [Table Text Block] |
Millions, for the Nine Months Ended September 30, |  | 2024 |  |  | 2023 |
Beginning balance |  | $ | 245 |  |  | $ | 253 |
Accruals |  |  | 100 |  |  |  | 85 |
Payments |  |  | (76 | ) |  |  | (75 | )
Ending balance at September 30, |  | $ | 269 |  |  | $ | 263 |
Current portion, ending balance at September 30, |  | $ | 119 |  |  | $ | 83 |
Personal Injury [Member] |
Notes Tables |
Schedule of Loss Contingencies by Contingency [Table Text Block] |
Millions, for the Nine Months Ended September 30, |  | 2024 |  |  | 2023 |
Beginning balance |  | $ | 383 |  |  | $ | 361 |
Current year accruals |  |  | 87 |  |  |  | 81 |
Changes in estimates for prior years |  |  | (2 | ) |  |  | 55 |
Payments |  |  | (75 | ) |  |  | (104 | )
Ending balance at September 30, |  | $ | 393 |  |  | $ | 393 |
Current portion, ending balance at September 30, |  | $ | 114 |  |  | $ | 105 |

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