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Note 15 - Commitments and Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Schedule of Loss Contingencies by Contingency, Environmental [Table Text Block] |
Millions, for the Nine Months Ended September 30, |  | 2022 |  |  | 2021 |
Beginning balance |  | $ | 243 |  |  | $ | 233 |
Accruals |  |  | 65 |  |  |  | 56 |
Payments |  |  | (45 | ) |  |  | (41 | )
Ending balance at September 30, |  | $ | 263 |  |  | $ | 248 |
Current portion, ending balance at September 30, |  | $ | 64 |  |  | $ | 60 |
Personal Injury [Member] |
Notes Tables |
Schedule of Loss Contingencies by Contingency [Table Text Block] |
Millions, for the Nine Months Ended September 30, |  | 2022 |  |  | 2021 |
Beginning balance |  | $ | 325 |  |  | $ | 270 |
Current year accruals |  |  | 79 |  |  |  | 69 |
Changes in estimates for prior years |  |  | 36 |  |  |  | 19 |
Payments |  |  | (93 | ) |  |  | (55 | )
Ending balance at September 30, |  | $ | 347 |  |  | $ | 303 |
Current portion, ending balance at September 30, |  | $ | 77 |  |  | $ | 62 |

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