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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions |  | 2 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 01, 2025 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 80 | $ 80 |  | $ 80 |  | $ 239
Impairment |  |  | 164 | $ 0 | 164 | $ 0 |
Trucking Operations |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 0 | 0 |  | 0 |  | 159
Impairment |  |  | 164 |  | 164 |  |
Trucking Operations | Quality Carriers, Inc. |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Impairment |  | 164 |  |  |  |  |
Impairment of intangible assets | $ 0 |  |  |  |  |  |
Rail Operations |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 80 | $ 80 |  | $ 80 |  | $ 80

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