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Leases | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Leases | Leases On January 1, 2019, we adopted ASC 842 using the optional transition method provided by ASU 2018-11. Our operating leases primarily consist of real estate leases such as offices, warehouses, and research and development facilities. Our leases have remaining lease terms ranging from 1 year to 10 years, some of which include options to extend the leases for up to 5 years or to terminate the leases within 1 year. Our finance leases are immaterial. Supplemental balance sheet and cash flow information related to operating leases is as follows:
| As of
| December 31, 2020 |  | December 31, 2019
Operating lease right-of-use assets(1) | $ | 94 |  |  | $ | 105 |
Accrued liabilities | 26 |  |  | 26 |
Operating lease liabilities | 77 |  |  | 88 |
Total operating lease liabilities | $ | 103 |  |  | $ | 114 |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows from operating leases for the year ended December 31, 2020 and 2019, respectively | $ | 31 |  |  | $ | 33 |
Weighted average remaining lease term, years | 5 |  | 5
Weighted average discount rate | 5 | % |  | 5 | %
(1) Operating lease right-of-use assets obtained in exchange for lease obligations were immaterial. |  |  |
Lease liability maturities:
| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Thereafter |  | Less Imputed Interest |  | Total
Operating leases | $ | 30 |  |  | $ | 24 |  |  | $ | 20 |  |  | $ | 16 |  |  | $ | 11 |  |  | $ | 15 |  |  | $ | (13) |  |  | $ | 103 |
Our total operating lease expenses were $33 million, $37 million and $39 million for the years ended December 31, 2020, 2019 and 2018, respectively. The total amount of variable and short-term lease payments was immaterial for all periods presented. As of December 31, 2020, 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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