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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.