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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill and Other Intangible Asset Balances | The following table presents goodwill and other intangible asset balances and adjustments to those balances for the nine months ended September 30, 2025. There is no remaining goodwill attributed to the Company's trucking operating segment as of September 30, 2025, compared to $159 million as of December 31, 2024. The goodwill balance attributed to the rail segment was $80 million at the end of each of the periods shown. All other intangible assets are attributed to the trucking operating segment.
| Goodwill |  | Intangible Assets |  |
(Dollars in Millions) | Net Carrying Amount |  | Cost | Accumulated Amortization | Net Carrying Amount |  | Total Goodwill and Other Intangible Assets - Net
Balance at December, 31, 2024 | $ | 239 |  |  | $ | 231 |  | $ | (37) |  | $ | 194 |  |  | $ | 433 |
Additions | 5 |  |  | 5 |  | — |  | 5 |  |  | 10 |
Amortization | — |  |  | — |  | (9) |  | (9) |  |  | (9) |
Impairment | (164) |  |  | — |  | — |  | — |  |  | (164) |
Balance at September, 30, 2025 | $ | 80 |  |  | $ | 236 |  | $ | (46) |  | $ | 190 |  |  | $ | 270 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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