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v3.20.4

Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |
Cost | $ 43,330 | $ 43,596
Accumulated Depreciation | (11,985) | (11,982)
Net Book Value | 31,345 | 31,614
Land |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 2,394 | 2,385
Accumulated Depreciation | 0 | 0
Net Book Value | $ 2,394 | $ 2,385
Depreciation Rate | 0.00% | 0.00%
Rail and other track material |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 7,153 | $ 7,024
Accumulated Depreciation | (1,892) | (1,905)
Net Book Value | $ 5,261 | $ 5,119
Depreciation Rate | 2.35% | 2.30%
Ties |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 5,685 | $ 5,536
Accumulated Depreciation | (1,601) | (1,496)
Net Book Value | $ 4,084 | $ 4,040
Depreciation Rate | 3.41% | 3.37%
Ballast |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 2,973 | $ 2,868
Accumulated Depreciation | (774) | (723)
Net Book Value | $ 2,199 | $ 2,145
Depreciation Rate | 2.76% | 2.72%
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 297 | $ 360
Accumulated Depreciation | 0 | 0
Net Book Value | $ 297 | $ 360
Depreciation Rate | 0.00% | 0.00%
Other roadway |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 14,320 | $ 14,261
Accumulated Depreciation | (3,926) | (3,786)
Net Book Value | $ 10,394 | $ 10,475
Depreciation Rate | 2.71% | 2.71%
Total roadway |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 30,428 | $ 30,049
Accumulated Depreciation | (8,193) | (7,910)
Net Book Value | 22,235 | 22,139
Locomotives |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 5,478 | 5,973
Accumulated Depreciation | (1,911) | (2,112)
Net Book Value | $ 3,567 | $ 3,861
Depreciation Rate | 3.56% | 3.66%
Freight cars |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 2,780 | $ 2,988
Accumulated Depreciation | (1,023) | (1,148)
Net Book Value | $ 1,757 | $ 1,840
Depreciation Rate | 2.59% | 2.45%
Computers and software |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 732 | $ 732
Accumulated Depreciation | (391) | (355)
Net Book Value | $ 341 | $ 377
Depreciation Rate | 9.86% | 9.68%
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 333 | $ 291
Accumulated Depreciation | 0 | 0
Net Book Value | $ 333 | $ 291
Depreciation Rate | 0.00% | 0.00%
Other equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 1,094 | $ 1,082
Accumulated Depreciation | (399) | (388)
Net Book Value | $ 695 | $ 694
Depreciation Rate | 4.70% | 4.89%
Total equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 10,417 | $ 11,066
Accumulated Depreciation | (3,724) | (4,003)
Net Book Value | 6,693 | 7,063
Other property |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 91 | 96
Accumulated Depreciation | (68) | (69)
Net Book Value | $ 23 | $ 27
Depreciation Rate | 2.24% | 1.05%

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