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Leases
9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Leases
Our total operating lease expense for the three and nine months ended September 30, 2021 were $6 million and $16 million, respectively and were $5 million and $16 million, for the three and nine months ended September 30, 2020. The total amount of variable and short-term lease payments was immaterial for all periods presented.
Supplemental balance sheet and cash flow information related to operating leases is as follows:
As of
September 30, 2021December 31, 2020
Operating lease right-of-use assets(1)
$46 $52 
Accrued liabilities16 16 
Operating lease liabilities36 43 
Total operating lease liabilities$52 $59 
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases for the nine-month periods ended September 30, 2021 and 2020, respectively
$14 $14 
Weighted average remaining lease term, units in years55
Weighted average discount rate%%

Lease liability maturities:
Remainder of 20212022202320242025ThereafterLess Imputed InterestTotal
Operating leases$$16 $13 $12 $$$(5)$52 
    
As of September 30, 2021, we did not have material additional operating leases that have not yet commenced.