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Note 11 - Properties - Schedule of Property and Equipment Major Categories (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Property, Plant and Equipment, Cost |  | $ 78,073 |  | $ 77,275
Property, Plant and Equipment, Net |  | 55,315 |  | 54,871
Property, Plant and Equipment, Accumulated Depreciation |  | 22,758 |  | 22,404
Land [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 5,333 |  | 5,339
Property, Plant and Equipment, Net |  | 5,333 |  | 5,339
Roadrail and Other Track Material [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 18,217 |  | 17,980
Property, Plant and Equipment, Net |  | 11,240 |  | 11,136
Property, Plant and Equipment, Accumulated Depreciation |  | $ 6,977 |  | $ 6,844
Property, Plant and Equipment, Useful Life (Year) |  | 43 years |  | 44 years
Road Ties [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 11,538 |  | $ 11,364
Property, Plant and Equipment, Net |  | 7,933 |  | 7,848
Property, Plant and Equipment, Accumulated Depreciation |  | $ 3,605 |  | $ 3,516
Property, Plant and Equipment, Useful Life (Year) |  | 34 years |  | 34 years
Road Ballast [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 6,140 |  | $ 6,070
Property, Plant and Equipment, Net |  | 4,237 |  | 4,218
Property, Plant and Equipment, Accumulated Depreciation |  | $ 1,903 |  | $ 1,852
Property, Plant and Equipment, Useful Life (Year) |  | 34 years |  | 34 years
Road, Other [Member] |  |  |  |
Property, Plant and Equipment, Cost | [1] | $ 21,945 |  | $ 21,593
Property, Plant and Equipment, Net |  | 17,134 | [1] | 16,936
Property, Plant and Equipment, Accumulated Depreciation |  | $ 4,811 | [1] | $ 4,657
Property, Plant and Equipment, Useful Life (Year) |  | 47 years | [1] | 47 years
Road [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 57,840 |  | $ 57,007
Property, Plant and Equipment, Net |  | 40,544 |  | 40,138
Property, Plant and Equipment, Accumulated Depreciation |  | 17,296 |  | 16,869
Equipment, Locomotives [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 9,158 |  | 9,371
Property, Plant and Equipment, Net |  | 5,541 |  | 5,592
Property, Plant and Equipment, Accumulated Depreciation |  | $ 3,617 |  | $ 3,779
Property, Plant and Equipment, Useful Life (Year) |  | 18 years |  | 17 years
Equipment, Freight Cars [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 2,407 |  | $ 2,227
Property, Plant and Equipment, Net |  | 1,545 |  | 1,405
Property, Plant and Equipment, Accumulated Depreciation |  | $ 862 |  | $ 822
Property, Plant and Equipment, Useful Life (Year) |  | 23 years |  | 24 years
Equipment, Work Equipment and Other [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 1,191 |  | $ 1,161
Property, Plant and Equipment, Net |  | 747 |  | 750
Property, Plant and Equipment, Accumulated Depreciation |  | $ 444 |  | $ 411
Property, Plant and Equipment, Useful Life (Year) |  | 18 years |  | 18 years
Equipment [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 12,756 |  | $ 12,759
Property, Plant and Equipment, Net |  | 7,833 |  | 7,747
Property, Plant and Equipment, Accumulated Depreciation |  | 4,923 |  | 5,012
Technology Equipment [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 1,268 |  | 1,209
Property, Plant and Equipment, Net |  | 729 |  | 686
Property, Plant and Equipment, Accumulated Depreciation |  | $ 539 |  | $ 523
Property, Plant and Equipment, Useful Life (Year) |  | 13 years |  | 12 years
Construction in Progress [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 876 |  | $ 961
Property, Plant and Equipment, Net |  | 876 |  | 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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