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Equity-accounted investees (Associate financial position) (Details) - CAD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 07, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of significant investments in associates [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 600,462,000 | $ 566,809,000 | $ 1,143,674,000
Non-current assets |  | 7,983,820,000 | 8,092,167,000 |
Current liabilities |  | (1,185,761,000) | (1,189,104,000) |
Current portion of long-term debt |  | (285,707,000) | (499,821,000) |
Other current liabilities |  | (221,820,000) | (48,544,000) |
Non-current liabilities |  | (2,356,913,000) | (2,650,644,000) |
Long-term debt |  | (995,583,000) | (1,284,353,000) |
Investment in equity-accounted investee |  | 3,218,456,000 | 3,173,185,000 |
Joint Venture Inkai LLP [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Cash and cash equivalents |  | 47,282,000 | 24,074,000 |
Other current assets |  | 694,041,000 | 551,917,000 |
Non-current assets |  | 307,801,000 | 332,655,000 |
Current liabilities |  | (42,368,000) | (40,985,000) |
Non-current liabilities |  | (27,802,000) | (30,211,000) |
Net assets |  | 978,954,000 | 837,450,000 |
Cameco's share of net assets |  | 391,582,000 | 334,980,000 |
Consolidating adjustments |  | (93,365,000) | (74,223,000) |
Fair value increment |  | 77,992,000 | 81,090,000 |
Dividends declared but not received |  | 9,760,000 | 5,952,000 |
Dividends in excess of ownership percentage |  | (107,179,000) | (74,843,000) |
Impact of foreign exchange on acquisition costs |  | 7,920,000 | 850,000 |
Investment in equity-accounted investee |  | $ 286,710,000 | $ 273,806,000 |
Ownership interest in associates |  | 40.00% | 40.00% |
Westinghouse Electric Company [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 255,589,000 | $ 265,146,000 |
Other current assets |  | 2,737,164,000 | 2,364,602,000 |
Intangible assets |  | 7,821,802,000 | 7,655,386,000 |
Goodwill |  | 1,698,174,000 | 1,534,947,000 |
Non-current assets |  | 3,113,031,000 | 3,102,566,000 |
Current portion of long-term debt |  | (44,576,000) | (208,959,000) |
Other current liabilities |  | (2,751,396,000) | (2,255,099,000) |
Long-term debt |  | (4,924,398,000) | (4,554,227,000) |
Other non-current liabilities |  | (2,078,688,000) | (2,130,446,000) |
Net assets |  | 5,826,702,000 | 5,773,916,000 |
Cameco's share of net assets |  | 2,842,772,000 | 2,817,441,000 |
Acquisition costs |  | 83,896,000 | 83,916,000 |
Impact of foreign exchange on acquisition costs |  | 5,078,000 | (1,978,000) |
Investment in equity-accounted investee |  | $ 2,931,746,000 | $ 2,899,379,000 |
Ownership stake | 49.00% | 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 |  | $ 25,127,000 | $ 24,036,000 |
Westinghouse Electric Company [Member] | Attributable to Shareholders [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Investment in equity-accounted investee |  | $ 5,801,575,000 | $ 5,749,880,000 |

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