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Note 11 - Properties - Schedule of Property and Equipment Major Categories (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment, Cost |  | $ 77,275 |  | $ 75,420
Properties, net (Note 11) |  | 54,871 |  | 54,161
Property, Plant and Equipment, Accumulated Depreciation |  | 22,404 |  | 21,259
Land [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 5,339 |  | 5,246
Properties, net (Note 11) |  | 5,339 |  | 5,246
Roadrail and Other Track Material [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 17,980 |  | 17,620
Properties, net (Note 11) |  | 11,136 |  | 10,989
Property, Plant and Equipment, Accumulated Depreciation |  | $ 6,844 |  | $ 6,631
Property, Plant and Equipment, Useful Life (Year) |  | 44 years |  | 42 years
Road Ties [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 11,364 |  | $ 11,051
Properties, net (Note 11) |  | 7,848 |  | 7,720
Property, Plant and Equipment, Accumulated Depreciation |  | $ 3,516 |  | $ 3,331
Property, Plant and Equipment, Useful Life (Year) |  | 34 years |  | 34 years
Road Ballast [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 6,070 |  | $ 5,926
Properties, net (Note 11) |  | 4,218 |  | 4,173
Property, Plant and Equipment, Accumulated Depreciation |  | $ 1,852 |  | $ 1,753
Property, Plant and Equipment, Useful Life (Year) |  | 34 years |  | 34 years
Road, Other [Member] |  |  |  |
Property, Plant and Equipment, Cost | [1] | $ 21,593 |  | $ 21,030
Properties, net (Note 11) |  | 16,936 | [1] | 16,701
Property, Plant and Equipment, Accumulated Depreciation |  | $ 4,657 | [1] | $ 4,329
Property, Plant and Equipment, Useful Life (Year) |  | 47 years | [1] | 48 years
Road [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 57,007 |  | $ 55,627
Properties, net (Note 11) |  | 40,138 |  | 39,583
Property, Plant and Equipment, Accumulated Depreciation |  | 16,869 |  | 16,044
Equipment, Locomotives [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 9,371 |  | 9,375
Properties, net (Note 11) |  | 5,592 |  | 5,820
Property, Plant and Equipment, Accumulated Depreciation |  | $ 3,779 |  | $ 3,555
Property, Plant and Equipment, Useful Life (Year) |  | 17 years |  | 17 years
Equipment, Freight Cars [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 2,227 |  | $ 2,118
Properties, net (Note 11) |  | 1,405 |  | 1,329
Property, Plant and Equipment, Accumulated Depreciation |  | $ 822 |  | $ 789
Property, Plant and Equipment, Useful Life (Year) |  | 24 years |  | 25 years
Equipment, Work Equipment and Other [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 1,161 |  | $ 1,107
Properties, net (Note 11) |  | 750 |  | 756
Property, Plant and Equipment, Accumulated Depreciation |  | $ 411 |  | $ 351
Property, Plant and Equipment, Useful Life (Year) |  | 18 years |  | 18 years
Equipment [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 12,759 |  | $ 12,600
Properties, net (Note 11) |  | 7,747 |  | 7,905
Property, Plant and Equipment, Accumulated Depreciation |  | 5,012 |  | 4,695
Technology Equipment [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | 1,209 |  | 1,199
Properties, net (Note 11) |  | 686 |  | 679
Property, Plant and Equipment, Accumulated Depreciation |  | $ 523 |  | $ 520
Property, Plant and Equipment, Useful Life (Year) |  | 12 years |  | 13 years
Construction in Progress [Member] |  |  |  |
Property, Plant and Equipment, Cost |  | $ 961 |  | $ 748
Properties, net (Note 11) |  | 961 |  | 748
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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