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Leases - Balance Sheet Summary (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Operating Leases:    
Lease liability $ 44  
Finance Leases:    
Lease liability 64  
Pipeline and storage    
Operating Leases:    
ROU assets, net 18 $ 20
Lease liability 20 22
Finance Leases:    
ROU assets, net 28 29
Lease liability 40 40
Railcars    
Operating Leases:    
ROU assets, net 11 12
Lease liability 11 12
Real estate and other    
Operating Leases:    
ROU assets, net 15 16
Lease liability 13 14
Finance Leases:    
ROU assets, net 23 24
Lease liability $ 24 $ 25