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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Fair Value Derivatives (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | $ (2,082) | $ 1,180 | $ (1,280)
Non-Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (2,082) | 1,180 | (1,280)
Foreign exchange contracts | Non-Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (2,033) | 1,292 | (1,344)
Foreign exchange contracts | Non-Qualifying Derivative Instruments | Transportation and other services |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | 0 | 645 | (238)
Foreign exchange contracts | Non-Qualifying Derivative Instruments | Other income/(expense) |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (2,033) | 647 | (1,106)
Interest rate contracts | Non-Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | 112 | (63) | 10
Commodity contracts | Non-Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (163) | (41) | 50
Commodity contracts | Non-Qualifying Derivative Instruments | Transportation and other services |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (23) | (35) | 13
Commodity contracts | Non-Qualifying Derivative Instruments | Commodity sales |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (92) | 153 | 89
Commodity contracts | Non-Qualifying Derivative Instruments | Commodity costs |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (31) | (94) | (102)
Commodity contracts | Non-Qualifying Derivative Instruments | Operating and administrative expense |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (17) | (65) | 50
Other contracts | Non-Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | $ 2 | $ (8) | $ 4

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