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Debt - ABL Facility (Details) - ABL facility
1 Months Ended
Oct. 31, 2015
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Secured revolving loan credit agreement amount $ 1,000,000,000    
Letter of credit available for issuance (up to) 350,000,000    
Swing line loans available for issuance (up to) $ 50,000,000    
Total unamortized debt issuance costs   $ 4,000,000 $ 6,000,000
Line of credit facility, borrowing base   934,000,000  
Remaining borrowing availability   704,000,000  
Line of credit facility, amount drawn   $ 230,000,000  
Percentage of maximum portion of borrowing base attributable to equipment and rolling stock 20.00%    
Maximum      
Debt Instrument [Line Items]      
Fixed charge coverage ratio (not less than)   1  
LIBOR | Minimum      
Debt Instrument [Line Items]      
Percent added to reference rate in effect from time to time to set the interest rate 1.50%    
LIBOR | Maximum      
Debt Instrument [Line Items]      
Percent added to reference rate in effect from time to time to set the interest rate 2.00%    
Base Rate | Minimum      
Debt Instrument [Line Items]      
Percent added to reference rate in effect from time to time to set the interest rate 0.50%    
Base Rate | Maximum      
Debt Instrument [Line Items]      
Percent added to reference rate in effect from time to time to set the interest rate 1.00%