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Right of Use Asset (Notes) | 12 Months Ended
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Dec. 31, 2019
Disclosure of leases [Abstract] |
Right of Use Assets | Right of Use Assets The Corporation 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
New leases recognized Jan. 1, 2019 | 29 |  | 22 |  | 1 |  | — |  | — |  | 52 |
Adjustments on recognition(1) | (1) |  | (4) |  | — |  | — |  | — |  | (5) |
Transfers from PP&E, intangibles and other assets | — |  | — |  | 3 |  | 35 |  | — |  | 38 |
As at Jan. 1, 2019 | 28 |  | 18 |  | 4 |  | 35 |  | — |  | 85 |
Additions | 32 |  | 2 |  | — |  | 2 |  | 45 |  | 81 |
Depreciation | (1) |  | (4) |  | (2) |  | (11) |  | — |  | (18) |
Change in foreign exchange rates | (1) |  | — |  | — |  | — |  | — |  | (1) |
Transfers | — |  | — |  | — |  | (1) |  | — |  | (1) |
As at Dec. 31, 2019 | 58 |  | 16 |  | 2 |  | 25 |  | 45 |  | 146 |
(1) Adjusted by the amount of any prepaid or accrued lease payments, onerous contract provisions and lease inducements. In November 2019, the Corporation recognized a right of use asset and corresponding lease liability related to the initial 15-year term of its contract for transporting natural gas on the Pioneer Pipeline. The transportation contract provides the Corporation with the right to extend the contract for up to eight additional renewal periods of 24-months each. The amounts recognized represent the 50 per cent of the pipeline that is not owned by the Corporation. In December 2019, the Corporation recognized an additional $31 million of right of use assets and $31 million of lease liabilities for land leases at certain wind farms as a result of revised interpretations of the unit of account / identified asset concepts present in IFRS 16. For the year ended Dec. 31, 2019, TransAlta paid $25 million related to recognized lease liabilities, consisting of $4 million in interest and $21 million in principal repayments. For the year ended Dec. 31, 2019, the Corporation expensed $2 million related to short-term and $1 million related to low value leases. Short term leases (term of less than 12 months) and leases with total lease payments below the Corporation's capitalization threshold do not require recognition as lease liabilities and right of use assets. Some of the Corporation'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, 2019, the Corporation expensed $6 million in variable land lease payments for these leases. For further information regarding leases refer to Note 5, 10, 15, 23 and 35.

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