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Accounting standards | 12 Months Ended
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Dec. 31, 2018
Accounting Standards [Abstract] |
Accounting standards | 3. Accounting standards A. Changes in accounting policy On January 1, 2018, Cameco adopted the following new standards as issued by the International Accounting Standards Board (IASB) in accordance with the transitional provisions: i. Revenue IFRS 15 clarifies the principles for recognizing revenue from contracts with customers. Cameco adopted IFRS 15 using the cumulative effect method without practical expedients which does not require comparat ive financial statements to be restated. As the adoption of the new standard did not have a material impact on our existing revenue recognition practices, there was no cumulative effect on net earnings at January 1, 2018 that would have required restatemen t. The new standard did result in additional disclosures. See note 17. ii. Financial instruments IFRS 9 includes revised guidance on the classification and measurement of financial assets. While it largely retains the e xisting requirements in IAS 39, Financial Instruments: Recognition and Measurement for the classification and measurement of financial liabilities, it eliminates the previous categories for financial assets of held to maturity, loans and receivables and av ailable for sale. Upon adoption, we reclassified our financial instruments as follows:
|  |  | Original classification under IAS 39 |  | New classification under IFRS 9
Financial assets |  |  |  |
| Cash and cash equivalents |  | Loans and receivables |  | Amortized cost
| Accounts receivable |  | Loans and receivables |  | Amortized cost
| Derivative assets |  | FVTPL |  | FVTPL
| Investments in equity securities |  | Available for sale |  | FVOCI
| Advances receivable from Inkai |  | Loans and receivables |  | Amortized cost
Financial liabilities |  |  |  |
| Accounts payable and accrued liabilities |  | Other financial liabilities |  | Amortized cost
| Dividends payable |  | Other financial liabilities |  | Amortized cost
| Derivative liabilities |  | FVTPL |  | FVTPL
| Long-term debt |  | Other financial liabilities |  | Amortized cost
There was no impact on the measurement of any of these instruments at the date of transition. We did not have any financial assets or liabilities previously designated as measured at FVTPL that are no longer so designated. The new standard also includes a new ECL model for calculating impairment on financial assets. This change did not have a material impact on the consolidated financial statements. See note 26. IFRS 9 also introduces new hedge accounting requirements. Since Cameco does not apply hedge a ccounting, there was no impact on the consolidated financial statements. B. New standards and interpretations not yet adopted A number of new standards and amendments to existing standards are not yet effective for the year ended December 31, 2018 and have not been applied in preparing these consolidated financial statements. Cameco does not intend to early adopt any of the following standards or amendments to existing standards, unless otherwise noted. i. Leases In January 2016, the IASB issued IFR S 16, Leases (IFRS 16). IFRS 16 is effective for periods beginning on or after January 1, 2019, with early adoption permitted. IFRS 16 eliminates the current dual model for lessees, which distinguishes between on-balance sheet finance leases and off-balanc e sheet operating leases. Instead, there is a single, on-balance sheet accounting model that is similar to current finance lease accounting. Our assessment of the new standard included the review of contracts to identify arrangements that could contain lea ses that qualify for recognition under IFRS 16. This review also considered contracts containing embedded leases of right-of-use assets. Based on our assessment, which is substantially complete, we determined that we do not expect adoption of the standard to have a material impact on the financial statements, however we do expect to have additional disclosures. ii. Income tax In June 2017, the IASB issued IFRIC 23, Uncertainty over Income Tax Treatments (IFRIC 23). IFRIC 23 is effective for periods beginn ing on or after January 1, 2019 with early adoption permitted. IFRIC 23 provides guidance on the accounting for current and deferred tax liabilities and assets in circumstances in which there is uncertainty over income tax treatments. We do not expect ado ption of the standard to have a material impact on the financial statements.

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- Definition The disclosure of the known or reasonably estimable information relevant to assessing the possible impact that the application of a new IFRS, that has been issued but is not yet effective, will have. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 8 -IssueDate 2018-01-01 -Paragraph 30 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=8&date=2018-03-01&anchor=para_30_b&doctype=Standard -URIDate 2018-03-16 + Details
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