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Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |
Cost | $ 43,684 | $ 43,330
Accumulated Depreciation | (12,031) | (11,985)
Net Book Value | 31,653 | 31,345
Land |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 2,453 | 2,394
Accumulated Depreciation | 0 | 0
Net Book Value | $ 2,453 | $ 2,394
Depreciation Rate | 0.00% | 0.00%
Rail and other track material |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 7,330 | $ 7,153
Accumulated Depreciation | (1,907) | (1,892)
Net Book Value | $ 5,423 | $ 5,261
Depreciation Rate | 2.40% | 2.35%
Ties |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 5,779 | $ 5,685
Accumulated Depreciation | (1,642) | (1,601)
Net Book Value | $ 4,137 | $ 4,084
Depreciation Rate | 3.44% | 3.41%
Ballast |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 3,041 | $ 2,973
Accumulated Depreciation | (818) | (774)
Net Book Value | $ 2,223 | $ 2,199
Depreciation Rate | 2.79% | 2.76%
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 339 | $ 297
Accumulated Depreciation | 0 | 0
Net Book Value | $ 339 | $ 297
Depreciation Rate | 0.00% | 0.00%
Other roadway |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 14,111 | $ 14,320
Accumulated Depreciation | (3,733) | (3,926)
Net Book Value | $ 10,378 | $ 10,394
Depreciation Rate | 2.69% | 2.71%
Total roadway |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 30,600 | $ 30,428
Accumulated Depreciation | (8,100) | (8,193)
Net Book Value | 22,500 | 22,235
Locomotives |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 5,695 | 5,478
Accumulated Depreciation | (1,994) | (1,911)
Net Book Value | $ 3,701 | $ 3,567
Depreciation Rate | 3.87% | 3.56%
Freight cars |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 2,701 | $ 2,780
Accumulated Depreciation | (1,009) | (1,023)
Net Book Value | $ 1,692 | $ 1,757
Depreciation Rate | 2.59% | 2.59%
Computers and software |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 893 | $ 732
Accumulated Depreciation | (438) | (391)
Net Book Value | $ 455 | $ 341
Depreciation Rate | 10.34% | 9.86%
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 164 | $ 333
Accumulated Depreciation | 0 | 0
Net Book Value | $ 164 | $ 333
Depreciation Rate | 0.00% | 0.00%
Other equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 1,088 | $ 1,094
Accumulated Depreciation | (420) | (399)
Net Book Value | $ 668 | $ 695
Depreciation Rate | 4.63% | 4.70%
Total equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 10,541 | $ 10,417
Accumulated Depreciation | (3,861) | (3,724)
Net Book Value | 6,680 | 6,693
Other property |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 90 | 91
Accumulated Depreciation | (70) | (68)
Net Book Value | $ 20 | $ 23
Depreciation Rate | 2.25% | 2.24%

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