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Segmented Information - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | $ 62,907 | $ 41,133
North America |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 61,040 | 39,864
International |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 1,867 | 1,269
Elimination of intersegment amounts |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | (8,583) | (4,680)
Elimination of intersegment amounts | North America |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | (8,583) | (4,680)
Oil Sands | Operating segments |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 30,431 | 19,920
Oil Sands | Operating segments | Synthetic crude oil and diesel |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 22,539 | 14,452
Oil Sands | Operating segments | Bitumen |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 7,892 | 5,468
Oil Sands | Operating segments | North America |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 30,431 | 19,920
Oil Sands | Operating segments | North America | Synthetic crude oil and diesel |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 22,539 | 14,452
Oil Sands | Operating segments | North America | Bitumen |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 7,892 | 5,468
Exploration and Production | Operating segments |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 4,331 | 2,978
Exploration and Production | Operating segments | Crude oil and natural gas liquids |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 4,298 | 2,966
Exploration and Production | Operating segments | Natural gas |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 33 | 12
Exploration and Production | Operating segments | North America |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 2,464 | 1,709
Exploration and Production | Operating segments | North America | Crude oil and natural gas liquids |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 2,464 | 1,709
Exploration and Production | Operating segments | International |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 1,867 | 1,269
Exploration and Production | Operating segments | International | Crude oil and natural gas liquids |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 1,834 | 1,257
Exploration and Production | Operating segments | International | Natural gas |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 33 | 12
Refining and Marketing | Operating segments |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 36,728 | 22,915
Refining and Marketing | Operating segments | Gasoline |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 14,540 | 9,983
Refining and Marketing | Operating segments | Distillate |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 18,663 | 9,832
Refining and Marketing | Operating segments | Other |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 3,525 | 3,100
Refining and Marketing | Operating segments | North America |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 36,728 | 22,915
Refining and Marketing | Operating segments | North America | Gasoline |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 14,540 | 9,983
Refining and Marketing | Operating segments | North America | Distillate |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | 18,663 | 9,832
Refining and Marketing | Operating segments | North America | Other |  |
Segmented Information |  |
Total Gross Revenue from Contracts with Customers | $ 3,525 | $ 3,100

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