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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - FAIR VALUE OF DERIVATIVES (Details) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value of Derivatives
Short-term portion of derivative assets	$ 323	$ 327
Current derivative liabilities	(896)	(920)
Total net derivative asset/(liability)	(1,069)	(1,687)
Foreign exchange contracts
Fair Value of Derivatives
Total net derivative asset/(liability)	(299)	(1,102)
Interest rate contracts
Fair Value of Derivatives
Total net derivative asset/(liability)	(610)	(534)
Commodity contracts
Fair Value of Derivatives
Total net derivative asset/(liability)	(156)	(58)
Other contracts
Fair Value of Derivatives
Total net derivative asset/(liability)	(4)	7
Fair Value
Fair Value of Derivatives
Short-term portion of derivative assets	323	328
Long-term derivative assets	561	101
Current derivative liabilities	(894)	(936)
Long-term derivative liabilities	(1,059)	(1,180)
Total net derivative asset/(liability)		(1,687)
Fair Value | Foreign exchange contracts
Fair Value of Derivatives
Short-term portion of derivative assets	180	161
Long-term derivative assets	466	81
Current derivative liabilities	(185)	(410)
Long-term derivative liabilities	(760)	(934)
Total net derivative asset/(liability)	(299)	(1,102)
Fair Value | Interest rate contracts
Fair Value of Derivatives
Short-term portion of derivative assets	0
Long-term derivative assets	56
Current derivative liabilities	(425)	(353)
Long-term derivative liabilities	(241)	(181)
Total net derivative asset/(liability)	(610)	(534)
Fair Value | Commodity contracts
Fair Value of Derivatives
Short-term portion of derivative assets	143	163
Long-term derivative assets	39	17
Current derivative liabilities	(280)	(173)
Long-term derivative liabilities	(58)	(65)
Total net derivative asset/(liability)	(156)	(58)
Fair Value | Other contracts
Fair Value of Derivatives
Short-term portion of derivative assets		4
Long-term derivative assets		3
Current derivative liabilities	(4)
Total net derivative asset/(liability)		7
Level 1 | Fair Value
Fair Value of Derivatives
Short-term portion of derivative assets	43	0
Long-term derivative assets	1	0
Current derivative liabilities	(39)	(5)
Long-term derivative liabilities	(1)	0
Total net derivative asset/(liability)	4	(5)
Level 1 | Fair Value | Foreign exchange contracts
Fair Value of Derivatives
Short-term portion of derivative assets	0	0
Long-term derivative assets	0	0
Current derivative liabilities	0	0
Long-term derivative liabilities	0	0
Total net derivative asset/(liability)	0	0
Level 1 | Fair Value | Interest rate contracts
Fair Value of Derivatives
Short-term portion of derivative assets	0
Long-term derivative assets	0
Current derivative liabilities	0	0
Long-term derivative liabilities	0	0
Total net derivative asset/(liability)	0	0
Level 1 | Fair Value | Commodity contracts
Fair Value of Derivatives
Short-term portion of derivative assets	43	0
Long-term derivative assets	1	0
Current derivative liabilities	(39)	(5)
Long-term derivative liabilities	(1)	0
Total net derivative asset/(liability)	4	(5)
Level 1 | Fair Value | Other contracts
Fair Value of Derivatives
Short-term portion of derivative assets		0
Long-term derivative assets		0
Current derivative liabilities	0
Total net derivative asset/(liability)	0	0
Level 2 | Fair Value
Fair Value of Derivatives
Short-term portion of derivative assets	213	198
Long-term derivative assets	546	96
Current derivative liabilities	(632)	(786)
Long-term derivative liabilities	(1,009)	(1,121)
Total net derivative asset/(liability)	(882)	(1,613)
Level 2 | Fair Value | Foreign exchange contracts
Fair Value of Derivatives
Short-term portion of derivative assets	180	161
Long-term derivative assets	466	81
Current derivative liabilities	(185)	(410)
Long-term derivative liabilities	(760)	(934)
Total net derivative asset/(liability)	(299)	(1,102)
Level 2 | Fair Value | Interest rate contracts
Fair Value of Derivatives
Short-term portion of derivative assets	0
Long-term derivative assets	56
Current derivative liabilities	(425)	(353)
Long-term derivative liabilities	(241)	(181)
Total net derivative asset/(liability)	(610)	(534)
Level 2 | Fair Value | Commodity contracts
Fair Value of Derivatives
Short-term portion of derivative assets	33	33
Long-term derivative assets	24	12
Current derivative liabilities	(18)	(23)
Long-term derivative liabilities	(8)	(6)
Total net derivative asset/(liability)	31	16
Level 2 | Fair Value | Other contracts
Fair Value of Derivatives
Short-term portion of derivative assets		4
Long-term derivative assets		3
Current derivative liabilities	(4)
Total net derivative asset/(liability)	(4)	7
Level 3 | Fair Value
Fair Value of Derivatives
Short-term portion of derivative assets	67	130
Long-term derivative assets	14	5
Current derivative liabilities	(223)	(145)
Long-term derivative liabilities	(49)	(59)
Total net derivative asset/(liability)	(191)	(69)
Level 3 | Fair Value | Foreign exchange contracts
Fair Value of Derivatives
Short-term portion of derivative assets	0	0
Long-term derivative assets	0	0
Current derivative liabilities	0	0
Long-term derivative liabilities	0	0
Total net derivative asset/(liability)	0	0
Level 3 | Fair Value | Interest rate contracts
Fair Value of Derivatives
Short-term portion of derivative assets	0
Long-term derivative assets	0
Current derivative liabilities	0	0
Long-term derivative liabilities	0	0
Total net derivative asset/(liability)	0	0
Level 3 | Fair Value | Commodity contracts
Fair Value of Derivatives
Short-term portion of derivative assets	67	130
Long-term derivative assets	14	5
Current derivative liabilities	(223)	(145)
Long-term derivative liabilities	(49)	(59)
Total net derivative asset/(liability)	(191)	(69)
Level 3 | Fair Value | Other contracts
Fair Value of Derivatives
Short-term portion of derivative assets		0
Long-term derivative assets		0
Current derivative liabilities	0
Total net derivative asset/(liability)	$ 0	$ 0

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