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Leases (Tables)
 6 Months Ended
Jun. 30, 2020
Leases [Abstract]  
Summary of right of use asset and lease liability balances for operating and finance leases
The following tables summarize the right of use asset and lease liability balances for the Company’s operating and finance leases at June 30, 2020 and December 31, 2019:

(in millions)June 30, 2020December 31, 2019
Operating Leases:
ROU assets, net
Pipeline and storage$17  $20  
Railcars10  12  
Real estate and other15  16  
Lease liability
Pipelines and storage$19  $22  
Railcars10  12  
Real estate and other13  14  

(in millions)June 30, 2020December 31, 2019
Finance Leases:
ROU assets, net
Pipeline and storage$28  $29  
Real estate and other23  24  
Lease liability
Pipelines and storage$39  $40  
Real estate and other24  25  
Lease expense, lease terms, and discount rates For the three and six months ended June 30, 2020 and 2019, we recognized lease expense comprised of the following components:
Three Months Ended
June 30,		Six Months Ended
June 30,
(in millions)2020201920202019
Operating lease expense$5  $4  $9  $8  
Finance lease expense:
Amortization of ROU$1  $1  $3  $3  
Interest expense on lease liability2  1  3  3  
The following outlines the remaining lease terms and discount rates used in the measurement of the Company’s ROU assets and liabilities:
June 30, 2020December 31, 2019
Weighted-average remaining lease term (years)
Operating Leases3.33.7
Finance Leases8.59.0
Weighted-average discount rate
Operating Leases5.6 %5.6 %
Finance Leases8.9 %8.9 %
Summary of remaining minimum lease payments for operating leases
The following summarizes the remaining minimum lease payments through maturity of the Company’s right-of-use assets and liabilities at June 30, 2020:
(in millions)Operating LeasesFinancing
Leases
Remainder of 2020$8  $5  
202115  11  
202211  11  
20237  10  
20244  10  
Thereafter—  43  
Total lease payments45  90  
Less: imputed interest(3) (27) 
Total lease liability$42  $63  
Summary of remaining minimum lease payments for finance leases
The following summarizes the remaining minimum lease payments through maturity of the Company’s right-of-use assets and liabilities at June 30, 2020:
(in millions)Operating LeasesFinancing
Leases
Remainder of 2020$8  $5  
202115  11  
202211  11  
20237  10  
20244  10  
Thereafter—  43  
Total lease payments45  90  
Less: imputed interest(3) (27) 
Total lease liability$42  $63