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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI | $ (303) |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | $ 20 | $ (608) | $ 141
Amount of (gain) loss reclassified from AOCI to earnings | 46 |  |  |
Amount of (gain) loss reclassified from AOCI to earnings |  | 46 | 71 | 93
Estimated gain (loss) of AOCI related to cash flow hedges reclassified to earnings in the next 12 months |  |  | $ (70) |
Period to hedge exposures to the variability of cash flows for all forecasted transactions |  |  | 30 months |
Unrealized gain/(loss) on derivative | 0 | (4) | $ 0 | 3
Unrealized gain/(loss) on hedged item | 0 | 3 | 0 | (3)
Realized gain/(loss) on derivative | 0 | 2 | 0 | (1)
Realized gain/(loss) on hedged item | 0 | (2) | 0 | 1
Unrealized gain (loss) on derivatives |  |  | 1,112 | (549)
Non-Qualifying Derivative Instruments |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Unrealized gain (loss) on derivatives | 574 | (289) | 1,112 | (549)
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 | 0 |  |  |
Amount of (gain) loss reclassified from AOCI to earnings |  | (2) | 2 | (3)
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 | 412 | (277) | 1,028 | (701)
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 |  |  | 550 | (555)
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 |  |  | 478 | (146)
Foreign exchange contracts | Cash Flow Hedges |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI | (3) |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | (3) | (13) | 18
Foreign exchange contracts | Net Investment Hedges |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI | 1 |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | (5) | 2 | 11
Interest rate contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of (gain) loss reclassified from AOCI to earnings | 40 |  |  |
Amount of (gain) loss reclassified from AOCI to earnings |  | 54 | 72 | 94
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 | 0 | 178 | (2)
Interest rate contracts | Cash Flow Hedges |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI | (285) |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | 17 | (581) | 117
Commodity contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of (gain) loss reclassified from AOCI to earnings | 0 |  |  |
Amount of (gain) loss reclassified from AOCI to earnings |  | 0 | 0 | (1)
Commodity contracts | Non-Qualifying Derivative Instruments |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Unrealized gain (loss) on derivatives | 162 | (19) | (99) | 156
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 |  |  | (25) | 3
Commodity contracts | Non-Qualifying Derivative Instruments | Commodity |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Unrealized gain (loss) on derivatives |  |  | (490) | 10
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 |  |  | 392 | 127
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 |  |  | 24 | 16
Commodity contracts | Cash Flow Hedges |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI | (18) |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | (1) | (21) | (3)
Other contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of (gain) loss reclassified from AOCI to earnings | 6 |  |  |
Amount of (gain) loss reclassified from AOCI to earnings |  | (6) | (3) | 3
Other contracts | Non-Qualifying Derivative Instruments |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Unrealized gain (loss) on derivatives | 0 | 7 | 5 | (2)
Other contracts | Cash Flow Hedges |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI | $ 2 |  |  |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | $ 12 | $ 5 | $ (2)

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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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