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Leases (Tables)
 9 Months Ended
Sep. 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 September 30, 2020 and December 31, 2019:

(in millions)September 30, 2020December 31, 2019
Operating Leases:
ROU assets, net
Pipeline and storage$17 $20 
Railcars9 12 
Real estate and other16 16 
Lease liability
Pipelines and storage$17 $22 
Railcars9 12 
Real estate and other15 14 

(in millions)September 30, 2020December 31, 2019
Finance Leases:
ROU assets, net
Pipeline and storage$27 $29 
Real estate and other22 24 
Lease liability
Pipelines and storage$39 $40 
Real estate and other23 25 
Lease expense, lease terms, and discount rates For the three and nine months ended September 30, 2020 and 2019, we recognized lease expense comprised of the following components:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in millions)2020201920202019
Operating lease expense$4 $4 $13 $12 
Finance lease expense:
Amortization of ROU$2 $2 $5 $5 
Interest expense on lease liability1 2 4 5 
The following outlines the remaining lease terms and discount rates used in the measurement of the Company’s ROU assets and liabilities:
September 30, 2020December 31, 2019
Weighted-average remaining lease term (years)
Operating Leases3.33.7
Finance Leases8.49.0
Weighted-average discount rate
Operating Leases5.5 %5.6 %
Finance Leases9.0 %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 September 30, 2020:
(in millions)Operating LeasesFinancing
Leases
Remainder of 2020$4 $3 
202115 11 
202212 11 
20238 10 
20245 10 
Thereafter— 43 
Total lease payments44 88 
Less: imputed interest(3)(26)
Total lease liability$41 $62 
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 September 30, 2020:
(in millions)Operating LeasesFinancing
Leases
Remainder of 2020$4 $3 
202115 11 
202212 11 
20238 10 
20245 10 
Thereafter— 43 
Total lease payments44 88 
Less: imputed interest(3)(26)
Total lease liability$41 $62