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Right of Use Asset | 12 Months Ended
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Dec. 31, 2021
Disclosure of leases [Abstract] |
Right of Use Assets | Right-of-Use Assets The Company leases various properties and types of equipment. Lease contracts are typically made for fixed periods. Leases are negotiated on an individual basis and contain a wide range of terms and conditions. The lease agreements do not impose covenants, but leased assets may not be used as security for borrowing purposes. A reconciliation of the changes in the carrying amount of the right-of-use assets is as follows:
| Land | Buildings | Vehicles | Equipment | Pipeline | Total
As at Dec. 31, 2019 | 58 |  | 16 |  | 2 |  | 25 |  | 45 |  | 146 |
Additions | 3 |  | 13 |  | — |  | — |  | — |  | 16 |
Depreciation | (3) |  | (5) |  | (1) |  | (9) |  | (3) |  | (21) |
As at Dec. 31, 2020 | 58 |  | 24 |  | 1 |  | 16 |  | 42 |  | 141 |
Additions | — |  | 1 |  | — |  | — |  | — |  | 1 |
Acquisitions (Note 4) | 13 |  | — |  | — |  | — |  | — |  | 13 |
Depreciation | (3) |  | (5) |  | — |  | (2) |  | (1) |  | (11) |
Disposal of assets (Note 4) | — |  | — |  | — |  | — |  | (41) |  | (41) |
Transfers | — |  | — |  | — |  | (8) |  | — |  | (8) |
As at Dec. 31, 2021 | 68 |  | 20 |  | 1 |  | 6 |  | — |  | 95 |
On June 30, 2021, the Company closed the sale of the Pioneer Pipeline to ATCO. A s part of the transaction, the natural gas transp ortation agreement with th e Pioneer P ipeline Limited Partnership was terminated, which resulted in the derecognition of the right-of-use asset of $41 million and lease liability of $43 million related to the pipeline, resulting in a gain of $2 million. For the year ended Dec. 31, 2021, TransAlta paid $15 million (2020 — $33 million) related to recognized lease liabilities, consisting of $7 million in interest (2020 — $8 million) and $8 million (2020 — $25 million) in principal repayments. Short-term leases (term of less than 12 months) and leases with total lease payments below the Company's capitalization threshold do not require recognition as lease liabilities and right-of-use assets. Some of the Company's land leases that met the definition of a lease were not recognized as they require variable payments based on production or revenue. Additionally, certain land leases require payments to be made on the basis of the greater of the minimum fixed payments and variable payments based on production or revenue. For these leases, lease liabilities have been recognized on the basis of the minimum fixed payments. For the year ended Dec. 31, 2021, the Company expensed $6 million (2020 — $7 million) in variable land lease payments for these leases. For further information regarding leases refer to Note 5, 11, 24 and 36.

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