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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Earnings and Comprehensive Income (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of unrealized gain/(loss) recognized in OCI | $ (204) | $ (39) | $ 267 | $ (737)
Excluded components of fair value hedges | (1) | 5 | (2) | 8
Amount of loss reclassified from AOCI to earnings | 81 | 60 | 146 | 105
Estimated gain (loss) of AOCI related to cash flow hedges reclassified to earnings in the next 12 months |  |  | $ (90) |
Maximum term of hedging exposures to variability of cash flows |  |  | 30 months |
Unrealized gain (loss) on derivatives |  |  | $ 448 | (824)
Non-Qualifying Derivative Instruments |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Unrealized gain (loss) on derivatives | 133 | 732 | 448 | (824)
Foreign exchange contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of loss reclassified from AOCI to earnings | 2 | 1 | 3 | 2
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 | 218 | 1,246 | 454 | (757)
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 |  |  | 292 | (437)
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 |  |  | 162 | (320)
Interest rate contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of loss reclassified from AOCI to earnings | 79 | 59 | 142 | 103
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 | 0 | 3 | 2 | (15)
Commodity contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of loss reclassified from AOCI to earnings | (1) | 0 | 0 | 0
Commodity contracts | Non-Qualifying Derivative Instruments |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Unrealized gain (loss) on derivatives | (90) | (517) | (18) | (44)
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 |  |  | (3) | 17
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 |  |  | 144 | (403)
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 |  |  | (166) | 348
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 |  |  | 7 | (6)
Other contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of loss reclassified from AOCI to earnings | 1 | 0 | 1 | 0
Other contracts | Non-Qualifying Derivative Instruments |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Unrealized gain (loss) on derivatives | 5 | 0 | 10 | (8)
Cash Flow Hedges | Foreign exchange contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of unrealized gain/(loss) recognized in OCI | (5) | (13) | (25) | 6
Cash Flow Hedges | Interest rate contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of unrealized gain/(loss) recognized in OCI | (203) | (35) | 294 | (750)
Cash Flow Hedges | Commodity contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of unrealized gain/(loss) recognized in OCI | 4 | 0 | (4) | 9
Cash Flow Hedges | Other contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of unrealized gain/(loss) recognized in OCI | 1 | 1 | 4 | (6)
Fair Value Hedges | Foreign exchange contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Excluded components of fair value hedges | (1) | 5 | (2) | 8
Net Investment Hedges | Foreign exchange contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of unrealized gain/(loss) recognized in OCI | $ 0 | $ 3 | $ 0 | $ (4)

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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