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Nature of Operations and Significant Accounting Policies - Narrative (Details) mi in Thousands, $ in Millions |  | 1 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 05, 2017 | Jun. 30, 2017 USD ($) | Jun. 30, 2017 employee | Sep. 30, 2017 USD ($) state mi | Sep. 23, 2016 USD ($) | Dec. 30, 2016 USD ($)
Background |  |  |  |  |  |
Total number of rail route miles | mi |  |  |  | 21 |  |
Number of states rail network serves | state |  |  |  | 23 |  |
Allowance for Doubtful Accounts |  |  |  |  |  |
Allowance for doubtful accounts |  |  |  | $ 24 |  | $ 33
Other Items [Abstract] |  |  |  |  |  |
Payments for restructuring |  |  |  | 147 | $ 0 |
Shareholder vote percent | 93.00% |  |  |  |  |
Chief Executive Officer |  |  |  |  |  |
Other Items [Abstract] |  |  |  |  |  |
Reimbursement payment |  | $ 55 |  |  |  |
Lump sum cash payment owed |  |  |  | 29 |  |
Management Streamlining Initiative |  |  |  |  |  |
Other Items [Abstract] |  |  |  |  |  |
Workforce reduction (number of employees) | employee |  |  | 950 |  |  |
Payments for restructuring |  |  |  | 147 |  |
Management Streamlining Initiative | Severance |  |  |  |  |  |
Other Items [Abstract] |  |  |  |  |  |
Payments for restructuring |  |  |  | $ 77 |  |

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