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Note 11 - Properties (Details Textual) $ in Billions | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Number of Depreciable Asset Classes | 60 |  |
Cost of Property Repairs and Maintenance | $ 2.4 | $ 2.1 | $ 2.0
Railroad Transportation Equipment [Member] |  |  |
Term of Depreciation Studies (Year) | 3 years |  |
Railroad Transportation Track Assets [Member] |  |  |
Term of Depreciation Studies (Year) | 6 years |  |

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- Definition Information on the number of depreciable asset classes. + References No definition available. + Details
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Period Type: | instant

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- Definition Information on the term of depreciation studies to determine the estimated service lives of depreciable assets. + References No definition available. + Details
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- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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- Details
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- Details
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Balance Type: |
Period Type: |