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Leases - Balance Sheet Summary (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Operating Leases:    
Lease liability $ 38  
Finance Leases:    
Lease liability 60  
Pipeline and storage    
Operating Leases:    
ROU asset, net 15 $ 20
Lease liability 16 22
Finance Leases:    
ROU asset, net 26 29
Lease liability 38 40
Railcars    
Operating Leases:    
ROU asset, net 8 12
Lease liability 8 12
Real estate and other    
Operating Leases:    
ROU asset, net 14 16
Lease liability 14 14
Finance Leases:    
ROU asset, net 21 24
Lease liability $ 22 $ 25