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Revenue Recognition - Receivables and Contract Liabilities (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
term
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disaggregation of Revenue [Line Items]      
Receivables from contracts with customers $ 10   $ 12
Deferred revenue 5 $ 0 0
Total 756    
Less than 1 year 110    
Years 2 to 3 219    
Years 4 to 5 219    
More than 5 years 208    
Related Parties      
Disaggregation of Revenue [Line Items]      
Receivables from contracts with customers 27 24  
Deferred revenue 14 0 0
Third Parties      
Disaggregation of Revenue [Line Items]      
Receivables from contracts with customers 10 $ 11  
Deferred revenue $ 5   $ 0
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]      
Number of additional terms | term 10    
Additional term 1 year    
Transportation Services Operating Leases      
Disaggregation of Revenue [Line Items]      
Initial term 10 years