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Properties (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Cost $ 75,387 $ 74,246
Accumulated depreciation 21,012 20,330
Net book value 54,375 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 17,521 17,178
Accumulated depreciation 6,550 6,381
Net book value $ 10,971 $ 10,797
Estimated useful life 42 years 42 years
Road: Ties [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 10,997 $ 10,693
Accumulated depreciation 3,294 3,186
Net book value $ 7,703 $ 7,507
Estimated useful life 34 years 34 years
Road: Ballast [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 5,893 $ 5,752
Accumulated depreciation 1,723 1,669
Net book value $ 4,170 $ 4,083
Estimated useful life 34 years 34 years
Road: Other Roadway [Member]    
Property, Plant and Equipment [Line Items]    
Cost [1] $ 20,759 $ 20,331
Accumulated depreciation [1] 4,259 4,056
Net book value [1] $ 16,500 $ 16,275
Estimated useful life [1] 48 years 48 years
Total Road [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 55,170 $ 53,954
Accumulated depreciation 15,826 15,292
Net book value 39,344 38,662
Equipment: Locomotives [Member]    
Property, Plant and Equipment [Line Items]    
Cost 9,427 9,467
Accumulated depreciation 3,548 3,434
Net book value $ 5,879 $ 6,033
Estimated useful life 17 years 18 years
Equipment: Freight Cars [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 2,082 $ 2,083
Accumulated depreciation 790 779
Net book value $ 1,292 $ 1,304
Estimated useful life 25 years 25 years
Equipment: Work Equipment and Other [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 1,101 $ 1,081
Accumulated depreciation 340 322
Net book value $ 761 $ 759
Estimated useful life 18 years 18 years
Total Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 12,610 $ 12,631
Accumulated depreciation 4,678 4,535
Net book value 7,932 8,096
Technology and Other [Member]    
Property, Plant and Equipment [Line Items]    
Cost 1,176 1,136
Accumulated depreciation 508 503
Net book value $ 668 $ 633
Estimated useful life 12 years 12 years
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 1,157 $ 1,249
Net book value $ 1,157 $ 1,249
[1] Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.