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Properties - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 21 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) | Mar. 26, 2021 USD ($) phase property
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of labor costs relating to the deconstruction of old track |  | 20.00% |  |  |  | 20.00% |  |  | 20.00% |
Percentage of labor costs relating to the installation of new track |  | 80.00% |  |  |  | 80.00% |  |  | 80.00% |
Percentage of assets depreciated under the group-life method |  | 84.00% |  |  |  | 84.00% |  |  | 84.00% |
Properties |  | $ 48,105 |  |  | $ 46,505 | $ 48,105 | $ 46,505 |  | $ 48,105 |
Depreciation expense |  |  |  |  |  | 80 | 1,400 | $ 1,400 |  |
Gains on sale of properties |  |  |  |  |  | 238 | 454 | 35 |  |
Proceeds from property sale transaction |  |  |  |  |  | 246 | 529 | 56 |  |
Gains |  |  |  |  |  | 238 | 454 | 35 |  |
Impairment expense |  |  |  |  |  | $ 4 | $ 2 | $ 8 |  |
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  | Properties | Properties |  |  |
Government assistance received |  |  |  |  |  | $ 49 | $ 66 |  |  |
Non-freight accounts receivable |  |  |  |  |  | 34 | 7 |  |  |
Equipment assets |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Properties |  | 10,296 |  |  | 10,125 | $ 10,296 | 10,125 |  | 10,296 |
Life studies, frequency period |  |  |  |  |  | 3 years |  |  |  |
Road and track assets |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Properties |  | 34,792 |  |  | 34,076 | $ 34,792 | 34,076 |  | 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
Total property sale transaction price |  |  |  |  |  |  |  |  |  | $ 525
Proceeds from property sale transaction | $ 200 | 125 |  |  | $ 200 | $ 125 | 400 |  | 525 |
Gains | $ 349 | $ 2 | $ 122 | $ 20 |  | $ 144 | $ 349 |  | $ 493 |

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