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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.

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