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Leases | 9 Months Ended
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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, 2021 |  | December 31, 2020 |  |
Operating lease right-of-use assets(1) | $ | 46 |  |  | $ | 52 |  |  |
Accrued liabilities | 16 |  |  | 16 |  |  |
Operating lease liabilities | 36 |  |  | 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 years | 5 |  | 5 |  |
Weighted average discount rate | 5 | % |  | 5 | % |  |
Lease liability maturities:
| Remainder of 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Thereafter |  | Less Imputed Interest |  | Total
Operating leases | $ | 5 |  |  | $ | 16 |  |  | $ | 13 |  |  | $ | 12 |  |  | $ | 7 |  |  | $ | 4 |  |  | $ | (5) |  |  | $ | 52 |
As of September 30, 2021, we did not have material additional operating leases that have not yet commenced.

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 + Details
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