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Properties - Narrative (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 26, 2021 USD ($) property phase
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Percentage of labor costs relating to the deconstruction of old track |  |  | 20.00% | 20.00% |  |  |
Percentage of labor costs relating to the installation of new track |  |  | 80.00% | 80.00% |  |  |
Percentage of assets depreciated under the group-life method |  |  | 86.00% | 86.00% |  |  |
Properties |  |  | $ 46,505,000,000 | $ 46,505,000,000 | $ 45,530,000,000 |  |
Depreciation expense |  |  |  | 1,420,000,000 | 1,383,000,000 | $ 1,349,000,000 |
Gains on sale of properties |  |  |  | 454,000,000 | 35,000,000 | 151,000,000 |
Proceeds from property sale transaction |  |  |  | 529,000,000 | 56,000,000 | 254,000,000 |
Gain recognized on property sale transaction |  |  |  | 454,000,000 | 35,000,000 | 151,000,000 |
Impairment expense |  |  |  | 2,000,000 | 22,000,000 | $ 8,000,000 |
Equipment assets |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Properties |  |  | 10,125,000,000 | $ 10,125,000,000 | 10,227,000,000 |  |
Life studies, frequency period |  |  |  | 3 years |  |  |
Road and track assets |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Properties |  |  | 34,076,000,000 | $ 34,076,000,000 | $ 33,109,000,000 |  |
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 |  |  |  |  |  |  | $ 525,000,000
Proceeds from property sale transaction | $ 200,000,000 |  | 200,000,000 |  |  |  |
Gain recognized on property sale transaction | $ 349,000,000 |  | $ 0 |  |  |  |
Virginia Line Segments | Subsequent Event |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gain recognized on property sale transaction |  | $ 20,000,000 |  |  |  |  |

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