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Note 17 - Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Loss Contingencies by Contingency, Environmental [Table Text Block] |
Millions |  | 2021 |  |  | 2020 |  |  | 2019 |
Beginning balance |  | $ | 233 |  |  | $ | 227 |  |  | $ | 223 |
Accruals |  |  | 69 |  |  |  | 76 |  |  |  | 67 |
Payments |  |  | (59 | ) |  |  | (70 | ) |  |  | (63 | )
Ending balance at December 31 |  | $ | 243 |  |  | $ | 233 |  |  | $ | 227 |
Current portion, ending balance at December 31 |  | $ | 60 |  |  | $ | 65 |  |  | $ | 62 |
Personal Injury [Member] |
Notes Tables |
Schedule of Loss Contingencies by Contingency [Table Text Block] |
Millions |  | 2021 |  |  | 2020 |  |  | 2019 |
Beginning balance |  | $ | 270 |  |  | $ | 265 |  |  | $ | 271 |
Current year accruals |  |  | 93 |  |  |  | 72 |  |  |  | 78 |
Changes in estimates for prior years |  |  | 48 |  |  |  | (3 | ) |  |  | (11 | )
Payments |  |  | (86 | ) |  |  | (64 | ) |  |  | (73 | )
Ending balance at December 31 |  | $ | 325 |  |  | $ | 270 |  |  | $ | 265 |
Current portion, ending balance at December 31 |  | $ | 64 |  |  | $ | 60 |  |  | $ | 63 |

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