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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Assets And Liabilities, Lessee
The following tables summarize balance sheet data related to leases at December 31, 2020 and 2019 and our lease costs as of and for the year ended December 31, 2020 and 2019:

LeasesClassificationDecember 31, 2020December 31, 2019
Assets
Operating lease assetsOperating lease right-of-use assets$4 $4 
Finance lease assets
Property, plant and equipment, net (1)
16 17 
Total lease assets$20 $21 
Liabilities
Current
FinanceAccrued liabilities - third parties$1 $1 
Noncurrent
OperatingOperating lease liabilities4 4 
FinanceFinance lease liabilities24 24 
Total lease liabilities$29 $29 

(1) Finance lease assets are recorded net of accumulated amortization of $8 million as of December 31, 2020 and $6 million as of December 31, 2019.
Lease, Cost
Lease costClassificationDecember 31, 2020December 31, 2019
Operating lease cost (1)
Operations and maintenance - third parties$— $— 
Finance lease cost (cost resulting from lease payments):
Amortization of leased assetsDepreciation and amortization1 1 
Interest on lease liabilitiesInterest expense, net4 4 
Total lease cost$5 $5 
(1) Amounts for each year ended December 31, 2020 and 2019 were less than $1 million.
Supplemental Cash Flows, Lessee
December 31, 2020December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases (1)
$— $— 
Operating cash flows from finance leases(3)(4)
Financing cash flows from finance leases(1)(1)

(1) Amounts for each year ended December 31, 2020 and 2019 were less than $1 million .


December 31, 2020December 31, 2019
Weighted-average remaining lease term (years):
Operating leases1920
Finance leases1011
Weighted-average discount rate:
Operating leases5.8 %5.8 %
Finance leases14.3 %14.3 %
Lessee, Operating Lease, Liability, Maturity
The future annual maturity of lease payments as of December 31, 2020 for the above lease obligations was:


Maturity of lease liabilities
Operating Leases (1)
Finance Leases (2)
Total
2021$— $4 $4 
20221 4 5 
2023— 4 4 
20241 4 5 
2025— 5 5 
Remainder5 28 33 
Total lease payments7 49 56 
Less: Interest (3)
(3)(24)(27)
Present value of lease liabilities (4)
$4 $25 $29 

(1) Operating lease payments include $2 million related to options to extend lease terms that are reasonably certain of being exercised.
(2) Includes $24 million in principal and excludes $8 million in executory costs.
(3) Calculated using the interest rate for each lease.
(4) Includes the current portion of $1 million for the finance lease.
Finance Lease, Liability, Maturity
The future annual maturity of lease payments as of December 31, 2020 for the above lease obligations was:


Maturity of lease liabilities
Operating Leases (1)
Finance Leases (2)
Total
2021$— $4 $4 
20221 4 5 
2023— 4 4 
20241 4 5 
2025— 5 5 
Remainder5 28 33 
Total lease payments7 49 56 
Less: Interest (3)
(3)(24)(27)
Present value of lease liabilities (4)
$4 $25 $29 

(1) Operating lease payments include $2 million related to options to extend lease terms that are reasonably certain of being exercised.
(2) Includes $24 million in principal and excludes $8 million in executory costs.
(3) Calculated using the interest rate for each lease.
(4) Includes the current portion of $1 million for the finance lease.
Lessor, Operating Lease, Payments to be Received, Maturity
As of December 31, 2020, future annual maturity of lease payments to be received under the contract terms of these operating leases, which includes only the lease components of these leases, was estimated to be:

Maturity of lease payments
Operating leases (1)
2021$56 
202256 
202356 
202456 
202556 
Remainder451 
Total lease payments$731 

(1) Operating lease payments include $366 million related to options to extend lease terms that are reasonably certain of being exercised.