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Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |
Cost | $ 44,748 | $ 43,684
Accumulated Depreciation | (12,592) | (12,031)
Net Book Value | 32,156 | 31,653
Land |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 2,405 | 2,453
Accumulated Depreciation | 0 | 0
Net Book Value | $ 2,405 | $ 2,453
Depreciation Rate | 0.00% | 0.00%
Rail and other track material |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 7,589 | $ 7,330
Accumulated Depreciation | (1,971) | (1,907)
Net Book Value | $ 5,618 | $ 5,423
Depreciation Rate | 2.42% | 2.40%
Ties |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 5,981 | $ 5,779
Accumulated Depreciation | (1,696) | (1,642)
Net Book Value | $ 4,285 | $ 4,137
Depreciation Rate | 3.49% | 3.44%
Ballast |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 3,126 | $ 3,041
Accumulated Depreciation | (873) | (818)
Net Book Value | $ 2,253 | $ 2,223
Depreciation Rate | 2.84% | 2.79%
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 431 | $ 339
Accumulated Depreciation | 0 | 0
Net Book Value | $ 431 | $ 339
Depreciation Rate | 0.00% | 0.00%
Other roadway |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 14,270 | $ 14,111
Accumulated Depreciation | (3,948) | (3,733)
Net Book Value | $ 10,322 | $ 10,378
Depreciation Rate | 2.69% | 2.69%
Total roadway |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 31,397 | $ 30,600
Accumulated Depreciation | (8,488) | (8,100)
Net Book Value | 22,909 | 22,500
Locomotives |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 5,878 | 5,695
Accumulated Depreciation | (2,060) | (1,994)
Net Book Value | $ 3,818 | $ 3,701
Depreciation Rate | 3.66% | 3.87%
Freight cars |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 2,701 | $ 2,701
Accumulated Depreciation | (1,033) | (1,009)
Net Book Value | $ 1,668 | $ 1,692
Depreciation Rate | 2.51% | 2.59%
Computers and software |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 926 | $ 893
Accumulated Depreciation | (476) | (438)
Net Book Value | $ 450 | $ 455
Depreciation Rate | 9.10% | 10.34%
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 206 | $ 164
Accumulated Depreciation | 0 | 0
Net Book Value | $ 206 | $ 164
Depreciation Rate | 0.00% | 0.00%
Other equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 1,145 | $ 1,088
Accumulated Depreciation | (463) | (420)
Net Book Value | $ 682 | $ 668
Depreciation Rate | 4.51% | 4.63%
Total equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 10,856 | $ 10,541
Accumulated Depreciation | (4,032) | (3,861)
Net Book Value | 6,824 | 6,680
Other property |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 90 | 90
Accumulated Depreciation | (72) | (70)
Net Book Value | $ 18 | $ 20
Depreciation Rate | 2.26% | 2.25%

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