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Leases - Balance Sheet Summary (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Operating Leases:    
Lease liability $ 46  
Financing Leases:    
Lease liability 68  
Pipeline and storage    
Operating Leases:    
ROU assets, net 24  
Lease liability 25  
Financing Leases:    
ROU assets, net 31 $ 1
Lease liability 42  
Railcars    
Operating Leases:    
ROU assets, net 13  
Lease liability 13  
Real estate and other    
Operating Leases:    
ROU assets, net 10  
Lease liability 8  
Financing Leases:    
ROU assets, net 26 $ 25
Lease liability $ 26