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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - TOTAL DERIVATIVE INSTRUMENTS (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | $ (3,210) | $ (2,192)
Total Net Derivative Instruments | (3,210) | (2,192)
Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (2,894) | (1,991)
Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (301) | (155)
Net Investment Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (15) | (46)
Accounts receivable and other |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 498 | 296
Derivative assets, Amounts Available for Offset | (153) | (150)
Derivative assets, Total Net Derivative Instruments | 345 | 146
Accounts receivable and other | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 474 | 281
Accounts receivable and other | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 24 | 9
Accounts receivable and other | Net Investment Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented |  | 4
Accounts receivable and other | Fair Value Hedging | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented |  | 2
Deferred amounts and other assets |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 119 | 181
Derivative assets, Amounts Available for Offset | (60) | (146)
Derivative assets, Total Net Derivative Instruments | 59 | 35
Deferred amounts and other assets | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 72 | 149
Deferred amounts and other assets | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 47 | 25
Deferred amounts and other assets | Net Investment Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented |  | 1
Deferred amounts and other assets | Fair Value Hedging | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented |  | 6
Accounts payable and other |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (1,234) | (1,130)
Derivative liabilities, Amounts Available for Offset | 153 | 150
Derivative liabilities, Total Net Derivative Instruments | (1,081) | (980)
Accounts payable and other | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (1,065) | (936)
Accounts payable and other | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (169) | (146)
Accounts payable and other | Net Investment Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented |  | (42)
Accounts payable and other | Fair Value Hedging | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented |  | (6)
Other long-term liabilities |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (2,593) | (1,539)
Derivative liabilities, Amounts Available for Offset | 60 | 146
Derivative liabilities, Total Net Derivative Instruments | (2,533) | (1,393)
Other long-term liabilities | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (2,375) | (1,485)
Other long-term liabilities | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (203) | (43)
Other long-term liabilities | Net Investment Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (15) | (9)
Other long-term liabilities | Fair Value Hedging | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented |  | (2)
Forward currency contracts |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (2,718) | (1,383)
Total Net Derivative Instruments | (2,718) | (1,383)
Forward currency contracts | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (2,720) | (1,330)
Forward currency contracts | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | 17 | (7)
Forward currency contracts | Net Investment Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (15) | (46)
Forward currency contracts | Accounts receivable and other |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 47 | 143
Derivative assets, Amounts Available for Offset | (37) | (83)
Derivative assets, Total Net Derivative Instruments | 10 | 60
Forward currency contracts | Accounts receivable and other | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 47 | 138
Forward currency contracts | Accounts receivable and other | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented |  | 1
Forward currency contracts | Accounts receivable and other | Net Investment Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented |  | 4
Forward currency contracts | Deferred amounts and other assets |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 62 | 145
Derivative assets, Amounts Available for Offset | (39) | (125)
Derivative assets, Total Net Derivative Instruments | 23 | 20
Forward currency contracts | Deferred amounts and other assets | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 39 | 143
Forward currency contracts | Deferred amounts and other assets | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 23 | 1
Forward currency contracts | Deferred amounts and other assets | Net Investment Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented |  | 1
Forward currency contracts | Accounts payable and other |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (615) | (359)
Derivative liabilities, Amounts Available for Offset | 37 | 83
Derivative liabilities, Total Net Derivative Instruments | (578) | (276)
Forward currency contracts | Accounts payable and other | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (610) | (312)
Forward currency contracts | Accounts payable and other | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (5) | (5)
Forward currency contracts | Accounts payable and other | Net Investment Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented |  | (42)
Forward currency contracts | Other long-term liabilities |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (2,212) | (1,312)
Derivative liabilities, Amounts Available for Offset | 39 | 125
Derivative liabilities, Total Net Derivative Instruments | (2,173) | (1,187)
Forward currency contracts | Other long-term liabilities | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (2,196) | (1,299)
Forward currency contracts | Other long-term liabilities | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (1) | (4)
Forward currency contracts | Other long-term liabilities | Net Investment Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (15) | (9)
Interest rate contracts |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (515) | (348)
Total Net Derivative Instruments | (515) | (348)
Interest rate contracts | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (178) | (183)
Interest rate contracts | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (337) | (165)
Interest rate contracts | Accounts receivable and other |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 22 | 8
Derivative assets, Amounts Available for Offset | (2) | (3)
Derivative assets, Total Net Derivative Instruments | 20 | 5
Interest rate contracts | Accounts receivable and other | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 22 | 6
Interest rate contracts | Accounts receivable and other | Fair Value Hedging | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented |  | 2
Interest rate contracts | Deferred amounts and other assets |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 5 | 13
Derivative assets, Amounts Available for Offset |  | (2)
Derivative assets, Total Net Derivative Instruments | 5 | 11
Interest rate contracts | Deferred amounts and other assets | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 5 | 7
Interest rate contracts | Deferred amounts and other assets | Fair Value Hedging | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented |  | 6
Interest rate contracts | Accounts payable and other |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (341) | (329)
Derivative liabilities, Amounts Available for Offset | 2 | 3
Derivative liabilities, Total Net Derivative Instruments | (339) | (326)
Interest rate contracts | Accounts payable and other | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (178) | (183)
Interest rate contracts | Accounts payable and other | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (163) | (140)
Interest rate contracts | Accounts payable and other | Fair Value Hedging | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented |  | (6)
Interest rate contracts | Other long-term liabilities |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (201) | (40)
Derivative liabilities, Amounts Available for Offset |  | 2
Derivative liabilities, Total Net Derivative Instruments | (201) | (38)
Interest rate contracts | Other long-term liabilities | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented |  | 0
Interest rate contracts | Other long-term liabilities | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (201) | (38)
Interest rate contracts | Other long-term liabilities | Fair Value Hedging | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented |  | (2)
Commodity contracts |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | 30 | (457)
Total Net Derivative Instruments | 30 | (457)
Commodity contracts | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | 9 | (476)
Commodity contracts | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | 21 | 19
Commodity contracts | Accounts receivable and other |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 429 | 145
Derivative assets, Amounts Available for Offset | (114) | (64)
Derivative assets, Total Net Derivative Instruments | 315 | 81
Commodity contracts | Accounts receivable and other | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 427 | 143
Commodity contracts | Accounts receivable and other | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 2 | 2
Commodity contracts | Deferred amounts and other assets |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 52 | 23
Derivative assets, Amounts Available for Offset | (21) | (19)
Derivative assets, Total Net Derivative Instruments | 31 | 4
Commodity contracts | Deferred amounts and other assets | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 33 | 6
Commodity contracts | Deferred amounts and other assets | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative assets, Total Gross Derivative Instruments as Presented | 19 | 17
Commodity contracts | Accounts payable and other |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (273) | (439)
Derivative liabilities, Amounts Available for Offset | 114 | 64
Derivative liabilities, Total Net Derivative Instruments | (159) | (375)
Commodity contracts | Accounts payable and other | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (273) | (439)
Commodity contracts | Other long-term liabilities |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (178) | (186)
Derivative liabilities, Amounts Available for Offset | 21 | 19
Derivative liabilities, Total Net Derivative Instruments | (157) | (167)
Commodity contracts | Other long-term liabilities | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (178) | (186)
Other contracts |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (7) | (4)
Total Net Derivative Instruments | (7) | (4)
Other contracts | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (5) | (2)
Other contracts | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Total net derivative asset/(liability) | (2) | (2)
Other contracts | Accounts payable and other |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (5) | (3)
Derivative liabilities, Total Net Derivative Instruments | (5) | (3)
Other contracts | Accounts payable and other | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (4) | (2)
Other contracts | Accounts payable and other | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (1) | (1)
Other contracts | Other long-term liabilities |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (2) | (1)
Derivative liabilities, Total Net Derivative Instruments | (2) | (1)
Other contracts | Other long-term liabilities | Non-Qualifying Derivative Instruments |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | (1) |
Other contracts | Other long-term liabilities | Cash Flow Hedges | Designated as hedging instrument |  |
TOTAL DERIVATIVE INSTRUMENTS |  |
Derivative liabilities, Total Gross Derivative Instruments as Presented | $ (1) | $ (1)

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, after the effects of master netting arrangements and net of amounts that are available for offset but as a policy have been elected not to be offset. + References No definition available. + Details
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