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Note 11 - Properties - Schedule of Property and Equipment Major Categories (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Property, Plant and Equipment, Cost |  | $ 83,269 |  | $ 81,733
Property, Plant and Equipment, Net |  | 58,036 |  | 57,398
Property, Plant and Equipment, Accumulated Depreciation |  | 25,233 |  | 24,335
Land [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 5,439 |  | 5,426
Property, Plant and Equipment, Net |  | 5,439 |  | 5,426
Roadrail and Other Track Material [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 19,180 |  | 18,837
Property, Plant and Equipment, Net |  | 11,611 |  | 11,493
Property, Plant and Equipment, Accumulated Depreciation |  | $ 7,569 |  | $ 7,344
Property, Plant and Equipment, Useful Life (Year) |  | 46 years |  | 42 years
Road Ties [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 12,268 |  | $ 11,985
Property, Plant and Equipment, Net |  | 8,215 |  | 8,090
Property, Plant and Equipment, Accumulated Depreciation |  | $ 4,053 |  | $ 3,895
Property, Plant and Equipment, Useful Life (Year) |  | 34 years |  | 34 years
Road Ballast [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 6,457 |  | $ 6,345
Property, Plant and Equipment, Net |  | 4,309 |  | 4,284
Property, Plant and Equipment, Accumulated Depreciation |  | $ 2,148 |  | $ 2,061
Property, Plant and Equipment, Useful Life (Year) |  | 34 years |  | 34 years
Road, Other [Member] |  |  |  |
Property, Plant and Equipment, Cost | [1] | $ 23,697 |  | $ 23,175
Property, Plant and Equipment, Net |  | 18,096 | [1] | 17,807
Property, Plant and Equipment, Accumulated Depreciation |  | $ 5,601 | [1] | $ 5,368
Property, Plant and Equipment, Useful Life (Year) |  | 47 years | [1] | 47 years
Road [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 61,602 |  | $ 60,342
Property, Plant and Equipment, Net |  | 42,231 |  | 41,674
Property, Plant and Equipment, Accumulated Depreciation |  | 19,371 |  | 18,668
Equipment, Locomotives [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 9,561 |  | 9,295
Property, Plant and Equipment, Net |  | 5,811 |  | 5,704
Property, Plant and Equipment, Accumulated Depreciation |  | $ 3,750 |  | $ 3,591
Property, Plant and Equipment, Useful Life (Year) |  | 18 years |  | 18 years
Equipment, Freight Cars [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 2,964 |  | $ 2,765
Property, Plant and Equipment, Net |  | 1,940 |  | 1,809
Property, Plant and Equipment, Accumulated Depreciation |  | $ 1,024 |  | $ 956
Property, Plant and Equipment, Useful Life (Year) |  | 23 years |  | 23 years
Equipment, Work Equipment and Other [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 1,191 | [2] | $ 1,344
Property, Plant and Equipment, Net |  | 719 | [2] | 798
Property, Plant and Equipment, Accumulated Depreciation |  | $ 472 | [2] | $ 546
Property, Plant and Equipment, Useful Life (Year) |  | 17 years | [2] | 17 years
Equipment [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 13,716 |  | $ 13,404
Property, Plant and Equipment, Net |  | 8,470 |  | 8,311
Property, Plant and Equipment, Accumulated Depreciation |  | 5,246 |  | 5,093
Technology Equipment [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 1,423 |  | 1,388
Property, Plant and Equipment, Net |  | 807 |  | 814
Property, Plant and Equipment, Accumulated Depreciation |  | $ 616 |  | $ 574
Property, Plant and Equipment, Useful Life (Year) |  | 12 years |  | 12 years
Construction in Progress [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 1,089 |  | $ 1,173
Property, Plant and Equipment, Net |  | 1,089 |  | 1,173
Property, Plant and Equipment, Accumulated Depreciation |  | $ 0 |  | $ 0
[1] | Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.
[2] | For retirements of depreciable railroad properties that do not occur in the normal course of business, a gain or loss may be recognized if the retirement meets each of the following three conditions: (a) is unusual, (b) is material in amount, and (c) varies significantly from the retirement profile identified through our depreciation studies. In the second quarter of 2024, we sold a large portion of an intermodal equipment asset class resulting in a $46 million gain recognized in other expense in our Condensed Consolidated Statements of Income.

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