Pending Acquisition - Acquisition-Related Expense Associated with the Merger Agreement (Details) - Norfolk Southern - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Business Combination [Line Items] | ||||
| Total acquisition-related expense | $ 22 | $ 41 | $ 93 | $ 42 |
| Compensation and benefits | ||||
| Business Combination [Line Items] | ||||
| Total acquisition-related expense | 1 | 0 | 5 | 0 |
| Purchased services and materials | ||||
| Business Combination [Line Items] | ||||
| Total acquisition-related expense | 20 | 40 | 83 | 41 |
| Other | ||||
| Business Combination [Line Items] | ||||
| Total acquisition-related expense | $ 1 | $ 1 | $ 5 | $ 1 |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of expense for acquisition-related cost incurred to effect business combination and recognized separately from acquisition of asset and assumption of liability. Includes, but is not limited to, finder's fee and advisory, legal, accounting, valuation, and other professional and consulting fees. Excludes integration, restructuring, and other post-combination costs; cost related to acquisition of asset; and acquisition-related cost for transaction with third party. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|