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Note 14 - Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Schedule of Loss Contingencies by Contingency, Environmental [Table Text Block] |
Millions, for the Three Months Ended March 31, |  | 2022 |  |  | 2021 |
Beginning balance |  | $ | 243 |  |  | $ | 233 |
Accruals |  |  | 40 |  |  |  | 12 |
Payments |  |  | (15 | ) |  |  | (11 | )
Ending balance at March 31, |  | $ | 268 |  |  | $ | 234 |
Current portion, ending balance at March 31, |  | $ | 64 |  |  | $ | 63 |
Personal Injury [Member] |
Notes Tables |
Schedule of Loss Contingencies by Contingency [Table Text Block] |
Millions, for the Three Months Ended March 31, |  | 2022 |  |  | 2021 |
Beginning balance |  | $ | 325 |  |  | $ | 270 |
Current year accruals |  |  | 23 |  |  |  | 18 |
Changes in estimates for prior years |  |  | 6 |  |  |  | 21 |
Payments |  |  | (22 | ) |  |  | (16 | )
Ending balance at March 31, |  | $ | 332 |  |  | $ | 293 |
Current portion, ending balance at March 31, |  | $ | 67 |  |  | $ | 60 |

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