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Note 9 - Properties - Schedule of Property and Equipment Major Categories (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Property, Plant and Equipment, Cost |  | $ 79,841 |  | $ 79,255
Property, Plant and Equipment, Net |  | 56,274 |  | 56,038
Property, Plant and Equipment, Accumulated Depreciation |  | 23,567 |  | 23,217
Land [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 5,353 |  | 5,344
Property, Plant and Equipment, Net |  | 5,353 |  | 5,344
Roadrail and Other Track Material [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 18,532 |  | 18,419
Property, Plant and Equipment, Net |  | 11,375 |  | 11,323
Property, Plant and Equipment, Accumulated Depreciation |  | $ 7,157 |  | $ 7,096
Property, Plant and Equipment, Useful Life (Year) |  | 42 years |  | 43 years
Road Ties [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 11,764 |  | $ 11,676
Property, Plant and Equipment, Net |  | 8,012 |  | 7,977
Property, Plant and Equipment, Accumulated Depreciation |  | $ 3,752 |  | $ 3,699
Property, Plant and Equipment, Useful Life (Year) |  | 34 years |  | 34 years
Road Ballast [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 6,254 |  | $ 6,222
Property, Plant and Equipment, Net |  | 4,275 |  | 4,272
Property, Plant and Equipment, Accumulated Depreciation |  | $ 1,979 |  | $ 1,950
Property, Plant and Equipment, Useful Life (Year) |  | 34 years |  | 34 years
Road, Other [Member] |  |  |  |
Property, Plant and Equipment, Cost | [1] | $ 22,570 |  | $ 22,411
Property, Plant and Equipment, Net |  | 17,501 | [1] | 17,441
Property, Plant and Equipment, Accumulated Depreciation |  | $ 5,069 | [1] | $ 4,970
Property, Plant and Equipment, Useful Life (Year) |  | 47 years | [1] | 47 years
Road [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 59,120 |  | $ 58,728
Property, Plant and Equipment, Net |  | 41,163 |  | 41,013
Property, Plant and Equipment, Accumulated Depreciation |  | 17,957 |  | 17,715
Equipment, Locomotives [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 9,221 |  | 9,166
Property, Plant and Equipment, Net |  | 5,537 |  | 5,560
Property, Plant and Equipment, Accumulated Depreciation |  | $ 3,684 |  | $ 3,606
Property, Plant and Equipment, Useful Life (Year) |  | 18 years |  | 18 years
Equipment, Freight Cars [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 2,621 |  | $ 2,562
Property, Plant and Equipment, Net |  | 1,707 |  | 1,664
Property, Plant and Equipment, Accumulated Depreciation |  | $ 914 |  | $ 898
Property, Plant and Equipment, Useful Life (Year) |  | 23 years |  | 23 years
Equipment, Work Equipment and Other [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 1,278 |  | $ 1,253
Property, Plant and Equipment, Net |  | 788 |  | 780
Property, Plant and Equipment, Accumulated Depreciation |  | $ 490 |  | $ 473
Property, Plant and Equipment, Useful Life (Year) |  | 17 years |  | 17 years
Equipment [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 13,120 |  | $ 12,981
Property, Plant and Equipment, Net |  | 8,032 |  | 8,004
Property, Plant and Equipment, Accumulated Depreciation |  | 5,088 |  | 4,977
Technology Equipment [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 1,274 |  | 1,254
Property, Plant and Equipment, Net |  | 752 |  | 729
Property, Plant and Equipment, Accumulated Depreciation |  | $ 522 |  | $ 525
Property, Plant and Equipment, Useful Life (Year) |  | 12 years |  | 12 years
Construction in Progress [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 974 |  | $ 948
Property, Plant and Equipment, Net |  | 974 |  | 948
Property, Plant and Equipment, Accumulated Depreciation |  | $ 0 |  | $ 0
[1] | Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.

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