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Leases - Balance Sheet Summary (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Operating Leases:    
Lease liability $ 50  
Financing Leases:    
Lease liability 69  
Pipeline and storage    
Operating Leases:    
ROU assets, net 26  
Lease liability 27  
Financing Leases:    
ROU assets, net 31 $ 1
Lease liability 42  
Railcars    
Operating Leases:    
ROU assets, net 14  
Lease liability 14  
Real estate and other    
Operating Leases:    
ROU assets, net 11  
Lease liability 9  
Financing Leases:    
ROU assets, net 27 $ 25
Lease liability $ 27