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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of unrealized gain/(loss) recognized in OCI | $ 20 | $ 12 | $ 141 | $ 16
Amount of (gain)/loss reclassified from AOCI to earnings (effective portion) | 35 | (64) | 83 | (8)
Amount of (gain)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) | 11 | 4 | 10 | 6
Estimated gain of AOCI related to cash flow hedges reclassified to earnings in the next 12 months |  |  | $ 11 |
Period to hedge exposures to the variability of cash flows for all forecasted transactions |  |  | 30 months |
Unrealized gain (loss) on derivative in fair value hedge | (4) | 3 | $ (12) | 1
Unrealized gain (loss) on hedged item in fair value hedge | 3 | (3) | 11 | (1)
Total unrealized derivative fair value gain/(loss), net |  |  | (549) | 898
Gain on derivative |  |  |  | 1
Loss on derivative | 1 | 2 |  | 2
Gain (loss) on derivative, net | 0 | 0 |  | 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 | (289) | 480 | (549) | 898
Gain on derivative | 2 | 1 | 2 |
Loss on derivative |  |  | 1 |
Gain (loss) on derivative, net |  |  | 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) | (2) | (102) | (3) | (101)
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 | (277) | 434 | (701) | 707
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 |  |  | 555 | 398
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 |  |  | (146) | 309
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 | (3) | 3 | 18 | 1
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 | (5) | 65 | 11 | 73
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) | 43 | 36 | 84 | 84
Amount of (gain)/loss reclassified from AOCI to earnings (ineffective portion and amount excluded from effectiveness testing) | 11 | 4 | 10 | 6
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 | 0 | 32 | (2) | 14
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 | 17 | (41) | 117 | (55)
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) | 0 | (2) | (1) | (4)
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 | (19) | 19 | 156 | 182
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 |  |  | 3 | (37)
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 |  |  | 10 | 197
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 |  |  | 127 | 9
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 |  |  | 16 | 13
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 | (1) | (9) | (3) | 12
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) | (6) | 4 | 3 | 13
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 | 7 | (5) | (2) | (5)
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 | $ 12 | $ (6) | $ (2) | $ (15)

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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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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + 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 (d) -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 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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