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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