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Note 15 - Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Loss Contingencies by Contingency, Environmental [Table Text Block] |
Millions, for the Six Months Ended June 30, |  | 2022 |  |  | 2021 |
Beginning balance |  | $ | 243 |  |  | $ | 233 |
Accruals |  |  | 52 |  |  |  | 43 |
Payments |  |  | (29 | ) |  |  | (26 | )
Ending balance at June 30, |  | $ | 266 |  |  | $ | 250 |
Current portion, ending balance at June 30, |  | $ | 64 |  |  | $ | 63 |
Personal Injury [Member] |
Notes Tables |
Schedule of Loss Contingencies by Contingency [Table Text Block] |
Millions, for the Six Months Ended June 30, |  | 2022 |  |  | 2021 |
Beginning balance |  | $ | 325 |  |  | $ | 270 |
Current year accruals |  |  | 51 |  |  |  | 45 |
Changes in estimates for prior years |  |  | 36 |  |  |  | 17 |
Payments |  |  | (65 | ) |  |  | (31 | )
Ending balance at June 30, |  | $ | 347 |  |  | $ | 301 |
Current portion, ending balance at June 30, |  | $ | 70 |  |  | $ | 62 |

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