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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Earnings and Comprehensive Income (Details) - CAD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 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 | $ (230,000,000) |  | $ (838,000,000) |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | $ 72,000,000 |  | $ 213,000,000
Amount of (gain) loss reclassified from AOCI to earnings | 37,000,000 |  | 108,000,000 |
Amount of (gain) loss reclassified from AOCI to earnings |  | 52,000,000 |  | 145,000,000
Estimated gain (loss) of AOCI related to cash flow hedges reclassified to earnings in the next 12 months |  |  | $ (72,000,000) |
Period to hedge exposures to the variability of cash flows for all forecasted transactions |  |  | 27 months |
Unrealized gain/(loss) on derivative |  | 3,000,000 |  | (9,000,000)
Unrealized gain/(loss) on hedged item |  | (3,000,000) |  | 8,000,000
Realized gain/(loss) on derivative |  | (3,000,000) |  | (4,000,000)
Realized gain/(loss) on hedged item |  | 3,000,000 |  | 4,000,000
Outstanding fair value hedges | 0 |  | $ 0 |
Unrealized gain (loss) on derivatives |  |  | 1,005,000,000 | (319,000,000)
Non-Qualifying Derivative Instruments |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Unrealized gain (loss) on derivatives | (107,000,000) | 230,000,000 | 1,005,000,000 | (319,000,000)
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 | 2,000,000 |  | 4,000,000 |
Amount of (gain) loss reclassified from AOCI to earnings |  | 7,000,000 |  | 4,000,000
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 | (179,000,000) | 345,000,000 | 849,000,000 | (356,000,000)
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 |  |  | 366,000,000 | (346,000,000)
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 |  |  | 483,000,000 | (10,000,000)
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 | 2,000,000 |  | (11,000,000) |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | (16,000,000) |  | 2,000,000
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 | (1,000,000) |  | 1,000,000 |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | 25,000,000 |  | 36,000,000
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 | 36,000,000 |  | 108,000,000 |
Amount of (gain) loss reclassified from AOCI to earnings |  | 38,000,000 |  | 132,000,000
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 | 6,000,000 | 178,000,000 | 4,000,000
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 | (231,000,000) |  | (812,000,000) |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | 69,000,000 |  | 186,000,000
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 |  | 0 |
Amount of (gain) loss reclassified from AOCI to earnings |  | 0 |  | (1,000,000)
Commodity contracts | Non-Qualifying Derivative Instruments |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Unrealized gain (loss) on derivatives | 73,000,000 | (113,000,000) | (26,000,000) | 43,000,000
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 |  |  | (15,000,000) | (16,000,000)
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 |  |  | (418,000,000) | (42,000,000)
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 |  |  | 382,000,000 | 90,000,000
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 |  |  | 25,000,000 | 11,000,000
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 | (1,000,000) |  | (22,000,000) |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | 4,000,000 |  | 1,000,000
Other contracts |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Amount of (gain) loss reclassified from AOCI to earnings | (1,000,000) |  | (4,000,000) |
Amount of (gain) loss reclassified from AOCI to earnings |  | 7,000,000 |  | 10,000,000
Other contracts | Non-Qualifying Derivative Instruments |  |  |  |
The Effect of Derivative Instruments on the Statements of Earnings and Comprehensive Income |  |  |  |
Unrealized gain (loss) on derivatives | (1,000,000) | (8,000,000) | 4,000,000 | (10,000,000)
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 | $ 1,000,000 |  | $ 6,000,000 |
Cash flow hedge, amount of unrealized gain (loss) recognized in OCI |  | $ (10,000,000) |  | $ (12,000,000)

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