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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Earnings and Comprehensive Income (Details) - CAD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Amount of unrealized gain/(loss) recognized in OCI | $ 471 | $ (698)
Excluded components of fair value hedges | (1) | 3
Amount of loss reclassified from AOCI to earnings | 65 | 44
Estimated gain (loss) of AOCI related to cash flow hedges reclassified to earnings in the next 12 months | $ (113) |
Maximum term of hedging exposures to variability of cash flows | 33 months |
Unrealized gain (loss) on derivatives | $ 315 | (1,556)
Non-Qualifying Derivative Instruments |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Unrealized gain (loss) on derivatives | 315 | (1,556)
Foreign exchange contracts |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Amount of loss reclassified from AOCI to earnings | 1 | 1
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 | 236 | (2,003)
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 | 154 | (1,061)
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 | 82 | (942)
Interest rate contracts |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Amount of loss reclassified from AOCI to earnings | 63 | 43
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 | 2 | (18)
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
Commodity contracts | Non-Qualifying Derivative Instruments |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Unrealized gain (loss) on derivatives | 72 | 473
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) | 34
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 | 171 | 1,493
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 | (100) | (1,045)
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 | 4 | (9)
Other contracts |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Amount of loss reclassified from AOCI to earnings | 0 | 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 | (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 | (20) | 19
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 | 497 | (715)
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 | (8) | 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 | 3 | (7)
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) | 3
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 | $ (7)

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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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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (d) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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