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Equity-accounted investees (Associate financial position) (Details) - CAD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 07, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of significant investments in associates [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 566,809,000 | $ 1,143,674,000 | $ 1,247,447,000
Non-current assets |  | 8,092,167,000 | 5,311,157,000 |
Current liabilities |  | (1,189,104,000) | (560,841,000) |
Non-current liabilities |  | (2,650,644,000) | (2,235,887,000) |
Investment in equity-accounted investee |  | 3,173,185,000 | 210,972,000 |
JV Inkai [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Cash and cash equivalents |  | 24,074,000 | 14,950,000 |
Other current assets |  | 551,917,000 | 373,868,000 |
Non-current assets |  | 332,655,000 | 334,954,000 |
Current liabilities |  | (40,985,000) | (34,606,000) |
Non-current liabilities |  | (30,211,000) | (37,644,000) |
Net assets |  | 837,450,000 | 651,522,000 |
Cameco's share of net assets |  | 334,980,000 | 260,609,000 |
Consolidating adjustments |  | (74,223,000) | (82,275,000) |
Fair value increment |  | 81,090,000 | 83,675,000 |
Dividends declared but not received |  | 5,952,000 | 0 |
Dividends in excess of ownership percentage |  | (74,843,000) | (48,641,000) |
Impact of foreign exchange |  | 850,000 | (2,396,000) |
Investment in equity-accounted investee |  | $ 273,806,000 | $ 210,972,000 |
Ownership interest in associates |  | 40.00% | 40.00% |
Westinghouse Electric Company [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 265,146,000 |  |
Other current assets |  | 2,364,602,000 |  |
Intangible assets |  | 7,655,386,000 |  |
Goodwill |  | 1,534,947,000 |  |
Non-current assets |  | 3,102,566,000 |  |
Current liabilities |  | (2,464,058,000) |  |
Non-current liabilities |  | (6,684,673,000) |  |
Net assets |  | 5,773,916,000 |  |
Cameco's share of net assets |  | 2,817,441,000 |  |
Acquisition costs |  | 83,916,000 |  |
Impact of foreign exchange |  | (1,978,000) |  |
Investment in equity-accounted investee |  | $ 2,899,379,000 | $ 0 |
Ownership stake | 49.00% | 49.00% |  |
Westinghouse Electric Company [Member] | Non-Controlling Interest [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Investment in equity-accounted investee |  | $ 24,036,000 |  |
Westinghouse Electric Company [Member] | Attributable to Shareholders [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Investment in equity-accounted investee |  | $ 5,749,880,000 |  |

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