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Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Property, Plant and Equipment [Line Items] |  |
Cost | $ 49,788 | $ 46,591
Accumulated depreciation | (13,957) | (13,265)
Net book value | 35,831 | 33,326
Land |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 4,125 | 2,439
Accumulated depreciation | 0 | 0
Net book value | $ 4,125 | $ 2,439
Depreciation rate | 0.00% | 0.00%
Total roadway |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 33,909 | $ 32,625
Accumulated depreciation | (9,552) | (9,006)
Net book value | 24,357 | 23,619
Rail and other track material |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 8,402 | 8,011
Accumulated depreciation | (2,098) | (2,006)
Net book value | $ 6,304 | $ 6,005
Depreciation rate | 2.44% | 2.41%
Ties |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 6,450 | $ 6,205
Accumulated depreciation | (1,860) | (1,773)
Net book value | $ 4,590 | $ 4,432
Depreciation rate | 3.35% | 3.42%
Ballast |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 3,339 | $ 3,224
Accumulated depreciation | (1,005) | (937)
Net book value | $ 2,334 | $ 2,287
Depreciation rate | 2.73% | 2.80%
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 680 | $ 522
Accumulated depreciation | 0 | 0
Net book value | $ 680 | $ 522
Depreciation rate | 0.00% | 0.00%
Other roadway |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 15,038 | $ 14,663
Accumulated depreciation | (4,589) | (4,290)
Net book value | $ 10,449 | $ 10,373
Depreciation rate | 2.73% | 2.72%
Total equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 11,664 | $ 11,437
Accumulated depreciation | (4,329) | (4,185)
Net book value | 7,335 | 7,252
Locomotives |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 6,242 | 6,091
Accumulated depreciation | (2,180) | (2,105)
Net book value | $ 4,062 | $ 3,986
Depreciation rate | 3.66% | 3.64%
Freight cars |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 2,733 | $ 2,792
Accumulated depreciation | (1,021) | (1,037)
Net book value | $ 1,712 | $ 1,755
Depreciation rate | 2.45% | 2.42%
Computers and software |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 1,149 | $ 1,042
Accumulated depreciation | (570) | (542)
Net book value | $ 579 | $ 500
Depreciation rate | 9.88% | 9.36%
Construction in process |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 236 | $ 271
Accumulated depreciation | 0 | 0
Net book value | $ 236 | $ 271
Depreciation rate | 0.00% | 0.00%
Other equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 1,304 | $ 1,241
Accumulated depreciation | (558) | (501)
Net book value | $ 746 | $ 740
Depreciation rate | 4.60% | 4.61%
Other property |  |
Property, Plant and Equipment [Line Items] |  |
Cost | $ 90 | $ 90
Accumulated depreciation | (76) | (74)
Net book value | $ 14 | $ 16
Depreciation rate | 2.48% | 2.48%

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