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Properties - Narrative (Details) $ in Millions | 12 Months Ended | 21 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Mar. 26, 2021 property phase
Property, Plant and Equipment [Line Items] |  |  |  |  |
Percentage of labor costs relating to the deconstruction of old track | 20.00% |  |  |  |
Percentage of labor costs relating to the installation of new track | 80.00% |  |  |  |
Percentage of assets depreciated under the group-life method | 84.00% |  |  |  |
Properties | $ 50,320 | $ 48,105 |  | $ 48,105 |
Gains on sale of properties | 34 | 238 | $ 454 |  |
Proceeds from property sale transaction | 52 | 246 | 529 |  |
Gains | 34 | 238 | 454 |  |
Impairment expense | $ 2 | $ 4 | 2 |  |
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] | Properties | Properties |  |  |
Government assistance received | $ 84 | $ 49 |  |  |
Non-freight accounts receivable | 57 | 34 |  |  |
Equipment assets |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Properties | $ 10,643 | 10,296 |  | 10,296 |
Life studies, frequency period | 3 years |  |  |  |
Equipment assets | Service Life, Salvage Value And Other |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation expense |  | 80 |  |  |
Road and track assets |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Properties | $ 36,590 | 34,792 |  | 34,792 |
Life studies, frequency period | 6 years |  |  |  |
Virginia Line Segments |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Number of property rights for sale | property |  |  |  |  | 3
Number phases to complete property right sale transaction | phase |  |  |  |  | 3
Proceeds from property sale transaction | $ 0 | 125 | 400 | 525 |
Gains | $ 0 | $ 144 | $ 349 | $ 493 |

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