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Note 10 - Properties - Schedule of Property and Equipment Major Categories (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment, Cost |  | $ 77,595 |  | $ 77,275
Property, Plant and Equipment, Net |  | 55,064 |  | 54,871
Property, Plant and Equipment, Accumulated Depreciation |  | 22,531 |  | 22,404
Land [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 5,336 |  | 5,339
Property, Plant and Equipment, Net |  | 5,336 |  | 5,339
Roadrail and Other Track Material [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 18,102 |  | 17,980
Property, Plant and Equipment, Net |  | 11,192 |  | 11,136
Property, Plant and Equipment, Accumulated Depreciation |  | $ 6,910 |  | $ 6,844
Property, Plant and Equipment, Useful Life (Year) |  | 43 years |  | 44 years
Road Ties [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 11,455 |  | $ 11,364
Property, Plant and Equipment, Net |  | 7,892 |  | 7,848
Property, Plant and Equipment, Accumulated Depreciation |  | $ 3,563 |  | $ 3,516
Property, Plant and Equipment, Useful Life (Year) |  | 34 years |  | 34 years
Road Ballast [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 6,104 |  | $ 6,070
Property, Plant and Equipment, Net |  | 4,226 |  | 4,218
Property, Plant and Equipment, Accumulated Depreciation |  | $ 1,878 |  | $ 1,852
Property, Plant and Equipment, Useful Life (Year) |  | 34 years |  | 34 years
Road, Other [Member] |  |  |  |
Property, Plant and Equipment, Cost | [1] | $ 21,791 |  | $ 21,593
Property, Plant and Equipment, Net |  | 17,061 | [1] | 16,936
Property, Plant and Equipment, Accumulated Depreciation |  | $ 4,730 | [1] | $ 4,657
Property, Plant and Equipment, Useful Life (Year) |  | 47 years | [1] | 47 years
Road [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 57,452 |  | $ 57,007
Property, Plant and Equipment, Net |  | 40,371 |  | 40,138
Property, Plant and Equipment, Accumulated Depreciation |  | 17,081 |  | 16,869
Equipment, Locomotives [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 9,230 |  | 9,371
Property, Plant and Equipment, Net |  | 5,570 |  | 5,592
Property, Plant and Equipment, Accumulated Depreciation |  | $ 3,660 |  | $ 3,779
Property, Plant and Equipment, Useful Life (Year) |  | 18 years |  | 17 years
Equipment, Freight Cars [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 2,339 |  | $ 2,227
Property, Plant and Equipment, Net |  | 1,500 |  | 1,405
Property, Plant and Equipment, Accumulated Depreciation |  | $ 839 |  | $ 822
Property, Plant and Equipment, Useful Life (Year) |  | 23 years |  | 24 years
Equipment, Work Equipment and Other [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 1,172 |  | $ 1,161
Property, Plant and Equipment, Net |  | 744 |  | 750
Property, Plant and Equipment, Accumulated Depreciation |  | $ 428 |  | $ 411
Property, Plant and Equipment, Useful Life (Year) |  | 18 years |  | 18 years
Equipment [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 12,741 |  | $ 12,759
Property, Plant and Equipment, Net |  | 7,814 |  | 7,747
Property, Plant and Equipment, Accumulated Depreciation |  | 4,927 |  | 5,012
Technology Equipment [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 1,271 |  | 1,209
Property, Plant and Equipment, Net |  | 748 |  | 686
Property, Plant and Equipment, Accumulated Depreciation |  | $ 523 |  | $ 523
Property, Plant and Equipment, Useful Life (Year) |  | 13 years |  | 12 years
Construction in Progress [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 795 |  | $ 961
Property, Plant and Equipment, Net |  | 795 |  | 961
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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