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Properties - Schedule of Property and Equipment and Weighted Average Estimated Useful Life (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2024
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 81,733,000,000 |  | $ 83,840,000,000
Accumulated Depreciation |  | 24,335,000,000 |  | 25,497,000,000
Net Book Value |  | 57,398,000,000 |  | 58,343,000,000
Gain recognized in other expense |  | 0 | $ 0 |
Land |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | 5,426,000,000 |  | 5,441,000,000
Net Book Value |  | 5,426,000,000 |  | 5,441,000,000
Total road |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | 60,342,000,000 |  | 62,049,000,000
Accumulated Depreciation |  | 18,668,000,000 |  | 19,614,000,000
Net Book Value |  | 41,674,000,000 |  | 42,435,000,000
Rail and other track material |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | 18,837,000,000 |  | 19,283,000,000
Accumulated Depreciation |  | 7,344,000,000 |  | 7,642,000,000
Net Book Value |  | $ 11,493,000,000 |  | $ 11,641,000,000
Estimated Useful Life |  | 42 years |  | 46 years
Ties |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 11,985,000,000 |  | $ 12,358,000,000
Accumulated Depreciation |  | 3,895,000,000 |  | 4,109,000,000
Net Book Value |  | $ 8,090,000,000 |  | $ 8,249,000,000
Estimated Useful Life |  | 34 years |  | 34 years
Ballast |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 6,345,000,000 |  | $ 6,495,000,000
Accumulated Depreciation |  | 2,061,000,000 |  | 2,182,000,000
Net Book Value |  | $ 4,284,000,000 |  | $ 4,313,000,000
Estimated Useful Life |  | 34 years |  | 34 years
Other roadway |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 23,175,000,000 |  | $ 23,913,000,000
Accumulated Depreciation |  | 5,368,000,000 |  | 5,681,000,000
Net Book Value |  | $ 17,807,000,000 |  | $ 18,232,000,000
Estimated Useful Life |  | 47 years |  | 47 years
Total equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 13,404,000,000 |  | $ 13,750,000,000
Accumulated Depreciation |  | 5,093,000,000 |  | 5,243,000,000
Net Book Value |  | 8,311,000,000 |  | 8,507,000,000
Locomotives |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | 9,295,000,000 |  | 9,517,000,000
Accumulated Depreciation |  | 3,591,000,000 |  | 3,724,000,000
Net Book Value |  | $ 5,704,000,000 |  | $ 5,793,000,000
Estimated Useful Life |  | 18 years |  | 18 years
Freight cars |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 2,765,000,000 |  | $ 3,011,000,000
Accumulated Depreciation |  | 956,000,000 |  | 1,037,000,000
Net Book Value |  | $ 1,809,000,000 |  | $ 1,974,000,000
Estimated Useful Life |  | 23 years |  | 22 years
Work equipment and other |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 1,344,000,000 |  | $ 1,222,000,000
Accumulated Depreciation |  | 546,000,000 |  | 482,000,000
Net Book Value |  | $ 798,000,000 |  | $ 740,000,000
Estimated Useful Life |  | 17 years |  | 17 years
Technology and other |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 1,388,000,000 |  | $ 1,431,000,000
Accumulated Depreciation |  | 574,000,000 |  | 640,000,000
Net Book Value |  | $ 814,000,000 |  | $ 791,000,000
Estimated Useful Life |  | 12 years |  | 12 years
Construction in progress |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 1,173,000,000 |  | $ 1,169,000,000
Accumulated Depreciation |  | 0 |  | 0
Net Book Value |  | $ 1,173,000,000 |  | $ 1,169,000,000
Chassis Assets | Other Expense |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gain recognized in other expense | $ 46,000,000 |  |  |

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