9. LEASES

On January 1, 2019, we adopted the new lease standard using the optional transition method provided under ASU No. 2018-11, which allowed us to initially apply the amendments of the new lease standard at the adoption date. Upon adoption of the new lease standard, we elected the package of three practical expedient permitted under the transition guidance within the new lease standard, which among other things, allowed us to carry forward the historical lease classification on existing leases at adoption. In addition, we elected the practical expedient related to land easements, which allowed us to carry forward our accounting treatment for land easements on existing agreements. We also elected the hindsight practical expedient to determine the lease term for existing leases.

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The determination of whether a contract is or contains a lease is performed at the lease inception date. Lease right-of-use assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term, using incremental borrowing rates as the implicit rates are not readily determinable for our leases. The incremental borrowing rates are determined on a collateralized basis and vary from lease to lease depending on the country where the leased asset exists and the term of the lease arrangement. We combine lease components with non-lease components and account for them as a single lease component for all classes of underlying assets, except for leases of manufacturing and research facilities and administrative offices. For these assets, non-lease components are separated from lease components and accounted for as normal operating expenses.

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We primarily lease manufacturing and research facilities, administrative offices, land, tanks, railcars and equipment. Leases with an initial term of 12 months or less are not recognized on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. Our variable lease cost was nil for the year ended December 31, 2019. Our leases have remaining lives from one month to 38 years. Certain lease agreements include one or more options to renew, at our discretion, with renewal terms that can extend the lease term by approximately one year to 30 years or more. Renewal and termination options that we are reasonably certain to exercise have been included in the calculation of the lease right-of-use assets and lease liabilities. None of our lease agreements contain material residual value guarantees or material restrictions or covenants.

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The components of operating lease expense, cash flows and supplemental noncash information from continuing operations are as follows (dollars in millions):

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The weighted-average lease term and discount rate for our operating leases from continuing operations are as follows:

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The undiscounted future cash flows of operating lease liabilities from continuing operations as of December 31, 2019 are as follows (dollars in millions):

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Future minimum lease payments under operating leases from continuing operations as of December 31, 2018 are as follows (dollars in millions):

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As of December 31, 2019, we have additional leases, primarily for leases of manufacturing facilities, that have not yet commenced of approximately $43 million. These leases will commence beginning in 2020 through 2021 with lease terms of up to 20 years.