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Assets Held for Sale and Discontinued Operations - Summary of Assets and Liabilities or Disposal Groups Classified as Held for Sale (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
ASSETS |  |  |
Cash and cash equivalents | $ 744 | $ 1,883 | $ 1,427
Inventories | 2,946 | 2,685 |
Property, plant and equipment | 45,565 | 40,095 | $ 37,382
Total assets held for sale | 56,193 | 52,359 |
Liabilities [abstract] |  |  |
Current portion of lease liabilities | 195 | 132 |
Lease liabilities (Note 21(c)) | 866 | 439 |
Deferred income tax liabilities | 6,188 | 6,778 |
Provisions and other liabilities | 4,198 | 3,166 |
Total liabilities | $ 27,901 | 25,848 |
Discontinued operations |  |  |
ASSETS |  |  |
Cash and cash equivalents |  | 34 |
Inventories |  | 53 |
Prepaid and other current assets |  | 49 |
Financial and other assets |  | 43 |
Property, plant and equipment |  | 1,387 |
Total assets held for sale |  | 1,566 |
Liabilities [abstract] |  |  |
Trade accounts payable and other liabilities |  | 177 |
Current portion of lease liabilities |  | 9 |
Current income taxes payable |  | 46 |
Lease liabilities (Note 21(c)) |  | 200 |
Deferred income tax liabilities |  | 68 |
Provisions and other liabilities |  | 145 |
Total liabilities |  | 645 |
Discontinued operations | Quintette |  |  |
ASSETS |  |  |
Cash and cash equivalents |  | 0 |
Inventories |  | 0 |
Prepaid and other current assets |  | 0 |
Financial and other assets |  | 1 |
Property, plant and equipment |  | 263 |
Total assets held for sale |  | 264 |
Liabilities [abstract] |  |  |
Trade accounts payable and other liabilities |  | 5 |
Current portion of lease liabilities |  | 0 |
Current income taxes payable |  | 0 |
Lease liabilities (Note 21(c)) |  | 0 |
Deferred income tax liabilities |  | 50 |
Provisions and other liabilities |  | 35 |
Total liabilities |  | 90 |
Discontinued operations | Fort Hills |  |  |
ASSETS |  |  |
Cash and cash equivalents |  | 34 |
Inventories |  | 53 |
Prepaid and other current assets |  | 49 |
Financial and other assets |  | 42 |
Property, plant and equipment |  | 1,124 |
Total assets held for sale |  | 1,302 |
Liabilities [abstract] |  |  |
Trade accounts payable and other liabilities |  | 172 |
Current portion of lease liabilities |  | 9 |
Current income taxes payable |  | 46 |
Lease liabilities (Note 21(c)) |  | 200 |
Deferred income tax liabilities |  | 18 |
Provisions and other liabilities |  | 110 |
Total liabilities |  | $ 555 |

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