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Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |
Cost | $ 46,591 | $ 44,748
Accumulated Depreciation | (13,265) | (12,592)
Net Book Value | 33,326 | 32,156
Land |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 2,439 | 2,405
Accumulated Depreciation | 0 | 0
Net Book Value | $ 2,439 | $ 2,405
Depreciation Rate | 0.00% | 0.00%
Rail and other track material |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 8,011 | $ 7,589
Accumulated Depreciation | (2,006) | (1,971)
Net Book Value | $ 6,005 | $ 5,618
Depreciation Rate | 2.41% | 2.42%
Ties |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 6,205 | $ 5,981
Accumulated Depreciation | (1,773) | (1,696)
Net Book Value | $ 4,432 | $ 4,285
Depreciation Rate | 3.42% | 3.49%
Ballast |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 3,224 | $ 3,126
Accumulated Depreciation | (937) | (873)
Net Book Value | $ 2,287 | $ 2,253
Depreciation Rate | 2.80% | 2.84%
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 522 | $ 431
Accumulated Depreciation | 0 | 0
Net Book Value | $ 522 | $ 431
Depreciation Rate | 0.00% | 0.00%
Other roadway |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 14,663 | $ 14,270
Accumulated Depreciation | (4,290) | (3,948)
Net Book Value | $ 10,373 | $ 10,322
Depreciation Rate | 2.72% | 2.69%
Total roadway |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 32,625 | $ 31,397
Accumulated Depreciation | (9,006) | (8,488)
Net Book Value | 23,619 | 22,909
Locomotives |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 6,091 | 5,878
Accumulated Depreciation | (2,105) | (2,060)
Net Book Value | $ 3,986 | $ 3,818
Depreciation Rate | 3.64% | 3.66%
Freight cars |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 2,792 | $ 2,701
Accumulated Depreciation | (1,037) | (1,033)
Net Book Value | $ 1,755 | $ 1,668
Depreciation Rate | 2.42% | 2.51%
Computers and software |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 1,042 | $ 926
Accumulated Depreciation | (542) | (476)
Net Book Value | $ 500 | $ 450
Depreciation Rate | 9.36% | 9.10%
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 271 | $ 206
Accumulated Depreciation | 0 | 0
Net Book Value | $ 271 | $ 206
Depreciation Rate | 0.00% | 0.00%
Other equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 1,241 | $ 1,145
Accumulated Depreciation | (501) | (463)
Net Book Value | $ 740 | $ 682
Depreciation Rate | 4.61% | 4.51%
Total equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 11,437 | $ 10,856
Accumulated Depreciation | (4,185) | (4,032)
Net Book Value | 7,252 | 6,824
Other property |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 90 | 90
Accumulated Depreciation | (74) | (72)
Net Book Value | $ 16 | $ 18
Depreciation Rate | 2.48% | 2.26%

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