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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - EARNINGS AND COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Amount of unrealized gain/(loss) recognized in OCI | $ 121 | $ 4
Amount of (gain)/loss reclassified from AOCI to earnings (effective portion) | 48 | 56
Amount of (gain)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) | (1) | 2
Estimated gain of AOCI related to cash flow hedges reclassified to earnings in the next 12 months | $ 22 |
Period to hedge exposures to the variability of cash flows for all forecasted transactions | 33 months |
Unrealized loss on derivative in fair value hedge | $ 8 | 2
Unrealized gain on hedged item in fair value hedge | 8 | 2
Total unrealized derivative fair value gain/(loss), net | (260) | 418
Gain (loss) on derivative, net | 3 | 0
Non-Qualifying Derivative Instruments |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | (260) | 418
Gain (loss) on derivative, net | (3) | 0
Foreign exchange contracts |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Amount of (gain)/loss reclassified from AOCI to earnings (effective portion) | (1) | 1
Foreign exchange contracts | Non-Qualifying Derivative Instruments |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | (424) | 273
Foreign exchange contracts | Non-Qualifying Derivative Instruments | Transportation and other services revenues |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | 297 | 159
Foreign exchange contracts | Non-Qualifying Derivative Instruments | Other income/(expense) |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | (127) | 114
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 | 21 | (2)
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 | 16 | 8
Interest rate contracts | Interest expense |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Amount of (gain)/loss reclassified from AOCI to earnings (effective portion) | 41 | 48
Amount of (gain)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) | (1) | 2
Interest rate contracts | Non-Qualifying Derivative Instruments |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | (2) | (18)
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 | 100 | (14)
Commodity contracts |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Amount of (gain)/loss reclassified from AOCI to earnings (effective portion) | (1) | (2)
Commodity contracts | Non-Qualifying Derivative Instruments |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | 175 | 163
Commodity contracts | Non-Qualifying Derivative Instruments | Transportation and other services revenues |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | (1) | (22)
Commodity contracts | Non-Qualifying Derivative Instruments | Commodity sales |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | 82 | 187
Commodity contracts | Non-Qualifying Derivative Instruments | Commodity costs |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | 84 | 5
Commodity contracts | Non-Qualifying Derivative Instruments | Operating and administrative expense |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | 10 | (7)
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 | (2) | 21
Other contracts | Operating and administrative expense |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Amount of (gain)/loss reclassified from AOCI to earnings (effective portion) | 9 | 9
Other contracts | Non-Qualifying Derivative Instruments |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |
Total unrealized derivative fair value gain/(loss), net | (9) | 0
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 | $ (14) | $ (9)

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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