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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - EFFECTS ON EARNINGS AND COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of unrealized gain/(loss) recognized in OCI | $ (591) |  |
Amount of unrealized gains/(loss) recognized in OCI |  | $ (141) | $ 297
Amount (gain)/loss reclassified from AOCI to earnings | 158 |  |
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) |  | 191 | 279
Unrealized gain on derivative | 1,751 | (903) | 1,242
Unrealized gain on derivative |  | 7 |
Unrealized gain on hedged item |  | 1 |
Realized loss on derivative |  | (8) |
Realized loss on hedged item |  | (1) |
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 | $ 80 |  |
Period to hedge exposures to the variability of cash flows for all forecasted transactions | 24 months |  |
Forward currency contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | $ 5 |  |
Forward currency contracts | Other income/(expense) |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) |  | 5 | (104)
Forward currency 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 | (19) |  |
Amount of unrealized gains/(loss) recognized in OCI |  | 19 | (5)
Forward currency 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 | 2 |  |
Amount of unrealized gains/(loss) recognized in OCI |  | 31 | 284
Interest rate contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | 157 |  |
Interest rate contracts | Interest expense |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) |  | 184 | 384
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 | (559) |  |
Amount of unrealized gains/(loss) recognized in OCI |  | (190) | 6
Commodity contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | (1) |  |
Commodity contracts | Commodity costs |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) |  | (1) | (9)
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 | (25) |  |
Amount of unrealized gains/(loss) recognized in OCI |  | 2 | 11
Other contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount (gain)/loss reclassified from AOCI to earnings | (3) |  |
Other contracts | Operating and administrative expense |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) |  | 3 | 8
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 | 10 |  |
Amount of unrealized gains/(loss) recognized in OCI |  | (3) | 1
Interest Rate Swap | Interest expense |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Amount of (gains)/loss reclassified from AOCI to earnings (effective portion) |  |  | 296
Non-Qualifying Derivative Instruments | Forward currency contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain on derivative | 1,626 | (1,390) | 1,284
Non-Qualifying Derivative Instruments | Forward currency contracts | Transportation and other services revenues |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain on derivative | 930 | (1,108) | 800
Non-Qualifying Derivative Instruments | Forward currency contracts | Other income/(expense) |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain on derivative | 696 | (282) | 484
Non-Qualifying Derivative Instruments | Interest rate contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain on derivative | 178 | 5 | 157
Non-Qualifying Derivative Instruments | Commodity contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain on derivative | (62) | 485 | (199)
Non-Qualifying Derivative Instruments | Commodity contracts | Transportation and other services revenues |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain on derivative | (26) | 66 | (104)
Non-Qualifying Derivative Instruments | Commodity contracts | Commodity sales |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain on derivative | (544) | 599 | 90
Non-Qualifying Derivative Instruments | Commodity contracts | Commodity costs |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain on derivative | 459 | (193) | (223)
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 on derivative | 49 | 13 | 38
Non-Qualifying Derivative Instruments | Other contracts |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |
Unrealized gain on derivative | $ 9 | $ (3) | $ 0

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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=112277219&loc=d3e80748-113994 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + 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=112277219&loc=d3e80748-113994 + Details
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