of twelve months or less and leases for which the underlying asset is of low value, which are expensed in the consolidated statement of operations on a straight-line basis over the lease term.

The lease liability is initially measured at the present value of the lease payments that are not paid at the commencement date, discounted using the interest rate implicit in the lease, or, if not readily determinable, the incremental borrowing rate specific to the country, term and currency of the contract. Lease payments can include fixed payments, variable payments that depend on an index or rate known at the commencement date, as well as any extension or purchase options, if the Company is reasonably certain to exercise these options. The lease liability is subsequently measured at amortized cost using the effective interest method and remeasured with a corresponding adjustment to the related right-of-use asset when there is a change in future lease payments in case of renegotiation, changes of an index or rate or in case of reassessments of options.

The right-of-use asset comprises, at inception, the initial lease liability, any initial direct costs and, when applicable, the

obligations to refurbish the asset, less any incentives granted by the lessors. The right-of-use asset is subsequently depreciated, on a straight-line basis, over the lease term or, if the lease transfers the ownership of the underlying asset to the Company at the end of the lease term or, if the cost of the right-of-use asset reflects that the lessee will exercise a purchase option, over the estimated useful life of the underlying asset. Right-of-use assets are also subject to testing for impairment if there is an indicator that they may be impaired.

Variable lease payments not included in the measurement of the lease liabilities are expensed to the consolidated statement of operations in the period in which the events or conditions which trigger those payments occur.

In the statement of financial position, right-of-use assets and lease liabilities are classified, respectively, as part of property, plant and equipment and short-term/long-term debt.

Balances for the Company’s lease activities are summarized as follows:


	As at December 31, 2021	As at December 31, 2020
Lease liabilities	880	815
Right of-use assets:
Land, buildings and improvements	729	761
Machinery, equipment and others	343	278
Total right-of-use assets	1,072	1,039

	Year ended December 31, 2021	Year ended December 31, 2020
Depreciation and impairment charges:
Land, buildings and improvements	120	114
Machinery, equipment and others	70	101
Total depreciation and impairment charges	190	215

Other lease related expenses:
Interest expense on lease liabilities	33	66
Expenses of short-term leases	79	134
Expenses of leases of low-value assets	65	61
Expenses related to variable lease payments not included in the measurement of lease liabilities	86	73

Additions to right-of-use assets	313	233
Lease payments recorded as reduction of lease liabilities and cash outflow from financing activities	199	242

The Company's lease contracts relate to a variety of assets used in its operational and administrative activities through several units, such as land, buildings, vehicles, industrial machinery, logistic and commercial facilities and power generation facilities. There are no sale and lease back transactions and no restrictions or covenants are imposed by the Company's current effective lease contracts.

The maturity analysis of the lease liabilities as of December 31, 2021 and December 31, 2020, is as follows:


				December 31, 2021
	1 year or less	2-3 years	4-5 years	Greater than 5 years	TOTAL
Lease liabilities (undiscounted)	222	254	152	836	1,464


				December 31, 2020
	1 year or less	2-3 years	4-5 years	Greater than 5 years	TOTAL
Lease liabilities (undiscounted)	217	265	156	778	1,416

Expenses for variable lease payments relate to rental fees that vary based on the actual level of activities or performance of the underlying leased assets such as a percentage of sales of the Company's goods through certain leased commercial warehouses and fixed rental fees per actual unit of output produced or transported by the leased assets.

An estimation of the future cash outflows to which the Company is potentially exposed in relation to those contracts involving variable lease payments, which are not reflected in the measurement of lease liabilities as of December 31, 2021 and December 31, 2020, is as follows:


					December 31, 2021
	1 year or less	2-3 years	4-5 years	Greater than 5 years	TOTAL
Potential variable lease payments	79	140	84	119	422


					December 31, 2020
	1 year or less	2-3 years	4-5 years	Greater than 5 years	TOTAL
Potential variable lease payments	58	99	68	123	348

Also, some of the Company's lease contracts have extension and/or termination options as well as residual value guarantees whose amounts are not reflected in the measurement of the lease liabilities as of December 31, 2021 and December 31, 2020. The potential addition/(reduction) in future cash outflows to which the Company is exposed in case such options are exercised or the guarantees required are as shown in the table below:


				December 31, 2021
	1 year or less	2-3 years	4-5 years	Greater than 5 years	TOTAL
Potential extension options	1	2	—	1	4
Potential termination options	—	(1)	—	—	(1)
Potential residual value guarantees	—	1	2	4	7


				December 31, 2020
	1 year or less	2-3 years	4-5 years	Greater than 5 years	TOTAL
Potential extension options	1	1	—	1	3
Potential termination options	(1)	—	—	—	(1)
Potential residual value guarantees	1	1	2	3	7

Undiscounted amounts related to lease contracts not yet commenced and therefore not included in the recognized lease liabilities as of December 31, 2021 and December 31, 2020, to which the Company is committed are described below:


				December 31, 2021
	1 year or less	2-3 years	4-5 years	Greater than 5 years	TOTAL
Leases not yet commenced	2	7	8	55	72


				December 31, 2020
	1 year or less	2-3 years	4-5 years	Greater than 5 years	TOTAL
Leases not yet commenced	2	6	9	51	68

There were neither income from subleasing right-of-use assets nor gains or losses from sales and leaseback for the years ended December 31, 2021 and December 31, 2020.