XML 70 R53.htm IDEA: XBRL DOCUMENT v3.20.1
Properties (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Cost $ 74,658 $ 74,246
Accumulated depreciation 20,537 20,330
Net book value 54,121 53,916
Land [Member]    
Property, Plant and Equipment [Line Items]    
Cost 5,275 5,276
Net book value 5,275 5,276
Road: Rail and Other Track Material [Member]    
Property, Plant and Equipment [Line Items]    
Cost 17,288 17,178
Accumulated depreciation 6,440 6,381
Net book value $ 10,848 $ 10,797
Estimated useful life 42 years 42 years
Road: Ties [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 10,793 $ 10,693
Accumulated depreciation 3,230 3,186
Net book value $ 7,563 $ 7,507
Estimated useful life 34 years 34 years
Road: Ballast [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 5,798 $ 5,752
Accumulated depreciation 1,687 1,669
Net book value $ 4,111 $ 4,083
Estimated useful life 34 years 34 years
Road: Other Roadway [Member]    
Property, Plant and Equipment [Line Items]    
Cost [1] $ 20,486 $ 20,331
Accumulated depreciation [1] 4,124 4,056
Net book value [1] $ 16,362 $ 16,275
Estimated useful life [1] 48 years 48 years
Total Road [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 54,365 $ 53,954
Accumulated depreciation 15,481 15,292
Net book value 38,884 38,662
Equipment: Locomotives [Member]    
Property, Plant and Equipment [Line Items]    
Cost 9,456 9,467
Accumulated depreciation 3,453 3,434
Net book value $ 6,003 $ 6,033
Estimated useful life 18 years 18 years
Equipment: Freight Cars [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 2,089 $ 2,083
Accumulated depreciation 783 779
Net book value $ 1,306 $ 1,304
Estimated useful life 24 years 25 years
Equipment: Work Equipment and Other [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 1,094 $ 1,081
Accumulated depreciation 330 322
Net book value $ 764 $ 759
Estimated useful life 18 years 18 years
Total Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 12,639 $ 12,631
Accumulated depreciation 4,566 4,535
Net book value 8,073 8,096
Technology and Other [Member]    
Property, Plant and Equipment [Line Items]    
Cost 1,193 1,136
Accumulated depreciation 490 503
Net book value $ 703 $ 633
Estimated useful life 12 years 12 years
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Cost $ 1,186 $ 1,249
Net book value $ 1,186 $ 1,249
[1] Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.