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Leases - Balance Sheet Summary (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Operating Leases:    
Lease liability $ 47  
Financing Leases:    
Lease liability 67  
Pipeline and storage    
Operating Leases:    
ROU assets, net 22  
Lease liability 23  
Financing Leases:    
ROU assets, net 30 $ 1
Lease liability 41  
Railcars    
Operating Leases:    
ROU assets, net 12  
Lease liability 12  
Real estate and other    
Operating Leases:    
ROU assets, net 14  
Lease liability 12  
Financing Leases:    
ROU assets, net 25 $ 25
Lease liability $ 26