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Properties (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Cost $ 75,017 $ 74,246
Accumulated depreciation 20,747 20,330
Net book value 54,270 53,916
Land [Member]    
Property, Plant and Equipment [Line Items]    
Cost 5,274 5,276
Net book value 5,274 5,276
Road: Rail and Other Track Material [Member]    
Property, Plant and Equipment [Line Items]    
Cost 17,391 17,178
Accumulated depreciation 6,496 6,381
Net book value $ 10,895 $ 10,797
Estimated useful life 42 years 42 years
Road: Ties [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 10,886 $ 10,693
Accumulated depreciation 3,264 3,186
Net book value $ 7,622 $ 7,507
Estimated useful life 34 years 34 years
Road: Ballast [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 5,855 $ 5,752
Accumulated depreciation 1,704 1,669
Net book value $ 4,151 $ 4,083
Estimated useful life 34 years 34 years
Road: Other Roadway [Member]    
Property, Plant and Equipment [Line Items]    
Cost [1] $ 20,629 $ 20,331
Accumulated depreciation [1] 4,195 4,056
Net book value [1] $ 16,434 $ 16,275
Estimated useful life [1] 48 years 48 years
Total Road [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 54,761 $ 53,954
Accumulated depreciation 15,659 15,292
Net book value 39,102 38,662
Equipment: Locomotives [Member]    
Property, Plant and Equipment [Line Items]    
Cost 9,400 9,467
Accumulated depreciation 3,456 3,434
Net book value $ 5,944 $ 6,033
Estimated useful life 17 years 18 years
Equipment: Freight Cars [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 2,095 $ 2,083
Accumulated depreciation 784 779
Net book value $ 1,311 $ 1,304
Estimated useful life 24 years 25 years
Equipment: Work Equipment and Other [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 1,098 $ 1,081
Accumulated depreciation 338 322
Net book value $ 760 $ 759
Estimated useful life 18 years 18 years
Total Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 12,593 $ 12,631
Accumulated depreciation 4,578 4,535
Net book value 8,015 8,096
Technology and Other [Member]    
Property, Plant and Equipment [Line Items]    
Cost 1,196 1,136
Accumulated depreciation 510 503
Net book value $ 686 $ 633
Estimated useful life 12 years 12 years
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 1,193 $ 1,249
Net book value $ 1,193 $ 1,249
[1] Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.