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Properties - Narrative (Details) $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended | 40 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 06, 2024 USD ($) | Sep. 05, 2024 USD ($) | Mar. 15, 2024 USD ($) mi | Nov. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2027 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Operating lease expense |  |  |  |  | $ 5 | $ 26 | $ 25 |
Property sales and other transactions |  |  |  |  | 558 | 86 | 263 |
Interest costs incurred on debt |  |  |  |  | 833 | 743 | 708 |
Interest costs capitalized |  |  |  |  | $ 26 | $ 21 | $ 16 |
March 2024 Railway Purchase |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of miles railway line purchased | mi |  |  | 337 |  |  |  |  |
Personal property transaction amount |  |  | $ 1,700 |  |  |  |  |
Virginia Passenger Rail Authority | Railway Line |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property sales and other transactions |  | $ 315 |  |  |  |  |  |
Gain (loss) on disposition of property plant equipment |  | $ 323 |  | $ 53 |  |  |  |
Virginia Passenger Rail Authority | Scenario, Forecast | Railway Line |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property sales and other transactions |  |  |  |  |  |  |  | $ 357
City Of Charlotte | Railway Line |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property sales and other transactions | $ 74 |  |  |  |  |  |  |
Gain (loss) on disposition of property plant equipment | $ 57 |  |  |  |  |  |  |

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