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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Effects on Earnings and Comprehensive Income (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gain/(loss) recognized in OCI | $ 1,062 | $ 191 | $ (579)
Amount (gain)/loss reclassified from AOCI to earnings | $ 203 | 304 | 256
Period to hedge exposures to the variability of cash flows for all forecasted transactions | 36 months |  |
Realized loss on derivative | $ (431) | 59 | 265
Unrealized gain (loss) on derivatives | (1,280) | 173 | 756
Cash flow hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Estimated gain of AOCI related to cash flow hedges reclassified to earnings in the next 12 months | 67 |  |
Foreign exchange contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | 13 | 5 | 5
Foreign exchange contracts | Cash flow hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gain/(loss) recognized in OCI | 3 | (29) | (1)
Foreign exchange contracts | Fair value hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gain/(loss) recognized in OCI | (35) | (5) | 5
Foreign exchange contracts | Net investment hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gain/(loss) recognized in OCI | 0 | 0 | 13
Interest rate contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | 186 | 296 | 253
Interest rate contracts | Cash flow hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gain/(loss) recognized in OCI | 1,151 | 252 | (595)
Interest rate contracts | Fair value hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain on derivative | 262 | 8 |
Unrealized loss on hedged item | (254) | (15) |
Realized loss on derivative | (110) | (41) |
Realized gain on hedged item | 85 | 45 |
Commodity contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | 0 | 1 | 0
Commodity contracts | Cash flow hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gain/(loss) recognized in OCI | (53) | (28) | 2
Other contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | 4 | 2 | (2)
Other contracts | Cash flow hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gain/(loss) recognized in OCI | (4) | 1 | (3)
Non- Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (1,280) | 173 | 756
Non- Qualifying Derivative Instruments | Foreign exchange contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (1,344) | 92 | 902
Non- Qualifying Derivative Instruments | Foreign exchange contracts | Transportation and other services |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (238) | 98 | 533
Non- Qualifying Derivative Instruments | Foreign exchange contracts | Other income/(expense) |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (1,106) | (6) | 369
Non- Qualifying Derivative Instruments | Interest rate contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | 10 | 2 | (25)
Non- Qualifying Derivative Instruments | Commodity contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | 50 | 71 | (114)
Non- Qualifying Derivative Instruments | Commodity contracts | Transportation and other services |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | 13 | 9 | (2)
Non- Qualifying Derivative Instruments | Commodity contracts | Commodity sales |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | 89 | 160 | (321)
Non- Qualifying Derivative Instruments | Commodity contracts | Commodity costs |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | (102) | (105) | 207
Non- Qualifying Derivative Instruments | Commodity contracts | Operating and administrative expense |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | 50 | 7 | 2
Non- Qualifying Derivative Instruments | Other contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain (loss) on derivatives | $ 4 | $ 8 | $ (7)

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