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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gain/(loss) recognized in OCI | $ 191 | $ (579) | $ (591)
Amount (gain)/loss reclassified from AOCI to earnings | $ 304 | 256 | 158
Period to hedge exposures to the variability of cash flows for all forecasted transactions | 36 months |  |
Realized loss on derivative | $ 59 | 265 | 346
Unrealized gain/(loss) on derivative | 173 | 756 | 1,751
Cash Flow Hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Estimated loss of AOCI related to cash flow hedges reclassified to earnings in the next 12 months | 47 |  |
Foreign exchange contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | 5 | 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 | (29) | (1) | (19)
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 | (5) | 5 | 0
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 | 13 | 2
Interest rate contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | 296 | 253 | 157
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 | 252 | (595) | (559)
Interest rate contracts | Fair Value Hedges |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain/(loss) on derivative | 8 | (116) |
Unrealized gain/(loss) on hedged item | (15) | 133 |
Realized loss on derivative | (41) | (12) |
Realized gain on hedged item | 45 | 0 |
Commodity contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | 1 | 0 | (1)
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 | (28) | 2 | (25)
Other contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | 2 | (2) | (3)
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 | 1 | (3) | 10
Non- Qualifying Derivative Instruments |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain/(loss) on derivative | 173 | 756 | 1,751
Non- Qualifying Derivative Instruments | Foreign exchange contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain/(loss) on derivative | 92 | 902 | 1,626
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 derivative | 98 | 533 | 930
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 derivative | (6) | 369 | 696
Non- Qualifying Derivative Instruments | Interest rate contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain/(loss) on derivative | 2 | (25) | 178
Non- Qualifying Derivative Instruments | Commodity contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain/(loss) on derivative | 71 | (114) | (62)
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 derivative | 9 | (2) | (26)
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 derivative | 160 | (321) | (544)
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 derivative | (105) | 207 | 459
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 derivative | 7 | 2 | 49
Non- Qualifying Derivative Instruments | Other contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain/(loss) on derivative | $ 8 | $ (7) | $ 9

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