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Leases - Balance Sheet Summary (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Operating Leases    
Lease liability $ 42  
Finance Leases    
Lease liability 59  
Pipeline and storage    
Operating Leases    
ROU assets, net 19 $ 15
Lease liability 20 16
Finance Leases    
ROU assets, net 25 26
Lease liability 37 38
Railcars    
Operating Leases    
ROU assets, net 8 8
Lease liability 8 8
Finance Leases    
ROU assets, net 0 0
Lease liability 0 0
Real estate and other    
Operating Leases    
ROU assets, net 14 14
Lease liability 14 14
Finance Leases    
ROU assets, net 20 21
Lease liability $ 22 $ 22