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Leases (Tables)
 6 Months Ended
Jun. 30, 2021
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 (“ROU”) asset and lease liability balances for the Company’s operating and finance leases at June 30, 2021 and December 31, 2020:
June 30, 2021December 31, 2020
(in millions)Operating LeasesFinance LeasesOperating LeasesFinance Leases
ROU assets, net
Pipeline and storage$19 $25 $15 $26 
Railcars7 — 8 — 
Real estate and other14 19 14 21 
Lease liability
Pipelines and storage$19 $37 $16 $38 
Railcars7 — 8 — 
Real estate and other14 21 14 22 
Lease expense, lease terms, and discount rates For the three and six months ended June 30, 2021 and 2020, we recognized lease expense comprised of the following components:
Three Months Ended
June 30,		Six Months Ended
June 30,
(in millions)2021202020212020
Operating lease expense$4 $5 $8 $9 
Finance lease expense:
Amortization of ROU asset$1 $1 $3 $3 
Interest expense on lease liability2 2 3 3 
Short-term lease expense$2 $2 $3 $4 
The following outlines the remaining lease terms and discount rates used in the measurement of the Company’s ROU assets and liabilities:
June 30, 2021December 31, 2020
Operating LeasesFinance LeasesOperating LeasesFinance Leases
Weighted-average remaining lease term4.4 years7.7 years3.1 years8.1 years
Weighted-average discount rate5.5 %9.0 %5.5 %9.0 %
Summary of remaining minimum lease payments for operating leases The following summarizes the remaining minimum lease payments through maturity of the Company’s lease liabilities at June 30, 2021:
(in millions)Operating LeasesFinance Leases
Remainder of 2021$7 $6 
202213 11 
202311 10 
20247 10 
20252 10 
Thereafter5 33 
Total lease payments45 80 
Less: imputed interest(5)(22)
Total lease liability$40 $58 
Summary of remaining minimum lease payments for finance leases The following summarizes the remaining minimum lease payments through maturity of the Company’s lease liabilities at June 30, 2021:
(in millions)Operating LeasesFinance Leases
Remainder of 2021$7 $6 
202213 11 
202311 10 
20247 10 
20252 10 
Thereafter5 33 
Total lease payments45 80 
Less: imputed interest(5)(22)
Total lease liability$40 $58