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Revenue Recognition - Receivables and Contract Liabilities (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
term
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Disaggregation of Revenue [Line Items]      
Receivables from contracts with customers $ 14   $ 19
Deferred revenue 1 $ 8 8
Total 907    
Less than 1 year 108    
Years 2 to 3 215    
Years 4 to 5 217    
More than 5 years 367    
Related Parties      
Disaggregation of Revenue [Line Items]      
Receivables from contracts with customers 22 21  
Deferred revenue 1 3 3
Third Parties      
Disaggregation of Revenue [Line Items]      
Receivables from contracts with customers 14 $ 19  
Deferred revenue $ 1   $ 8
Transportation Services Operating Leases, Five Year Terms      
Disaggregation of Revenue [Line Items]      
Initial term 10 years    
Number of additional terms | term 2    
Additional term 5 years    
Transportation Services Operating Leases, One Year Terms      
Disaggregation of Revenue [Line Items]      
Initial term 10 years    
Number of additional terms | term 10    
Additional term 1 year    
Transportation Services Operating Leases      
Disaggregation of Revenue [Line Items]      
Initial term 10 years