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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Fair Value of Derivatives (Details) - CAD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value of Derivatives
Total net derivative asset/(liability)	$ (266)	$ (1,069)
Foreign exchange contracts
Fair Value of Derivatives
Total net derivative asset/(liability)	(85)	(299)
Interest rate contracts
Fair Value of Derivatives
Total net derivative asset/(liability)	(95)	(610)
Commodity contracts
Fair Value of Derivatives
Total net derivative asset/(liability)	(90)	(156)
Other contracts
Fair Value of Derivatives
Total net derivative asset/(liability)	4	(4)
Recurring basis
Fair Value of Derivatives
Current derivative assets	402	323
Long-term derivative assets	761	561
Current derivative liabilities	(714)	(894)
Long-term derivative liabilities	(715)	(1,059)
Total net derivative asset/(liability)	(266)	(1,069)
Recurring basis | Foreign exchange contracts
Fair Value of Derivatives
Current derivative assets	242	180
Long-term derivative assets	465	466
Current derivative liabilities	(249)	(185)
Long-term derivative liabilities	(543)	(760)
Total net derivative asset/(liability)	(85)	(299)
Recurring basis | Interest rate contracts
Fair Value of Derivatives
Long-term derivative assets	247	56
Current derivative liabilities	(240)	(425)
Long-term derivative liabilities	(102)	(241)
Total net derivative asset/(liability)	(95)	(610)
Recurring basis | Commodity contracts
Fair Value of Derivatives
Current derivative assets	158	143
Long-term derivative assets	47	39
Current derivative liabilities	(225)	(280)
Long-term derivative liabilities	(70)	(58)
Total net derivative asset/(liability)	(90)	(156)
Recurring basis | Other contracts
Fair Value of Derivatives
Current derivative assets	2
Long-term derivative assets	2
Current derivative liabilities		(4)
Total net derivative asset/(liability)	4	(4)
Level 1 | Recurring basis
Fair Value of Derivatives
Current derivative assets	55	43
Long-term derivative assets	8	1
Current derivative liabilities	(55)	(39)
Long-term derivative liabilities	(11)	(1)
Total net derivative asset/(liability)	(3)	4
Level 1 | Recurring basis | Foreign exchange contracts
Fair Value of Derivatives
Current 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 | Recurring basis | Interest rate contracts
Fair Value of Derivatives
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 | Recurring basis | Commodity contracts
Fair Value of Derivatives
Current derivative assets	55	43
Long-term derivative assets	8	1
Current derivative liabilities	(55)	(39)
Long-term derivative liabilities	(11)	(1)
Total net derivative asset/(liability)	(3)	4
Level 1 | Recurring basis | Other contracts
Fair Value of Derivatives
Current derivative assets	0
Long-term derivative assets	0
Current derivative liabilities		0
Total net derivative asset/(liability)	0	0
Level 2 | Recurring basis
Fair Value of Derivatives
Current derivative assets	281	213
Long-term derivative assets	741	546
Current derivative liabilities	(514)	(632)
Long-term derivative liabilities	(652)	(1,009)
Total net derivative asset/(liability)	(144)	(882)
Level 2 | Recurring basis | Foreign exchange contracts
Fair Value of Derivatives
Current derivative assets	242	180
Long-term derivative assets	465	466
Current derivative liabilities	(249)	(185)
Long-term derivative liabilities	(543)	(760)
Total net derivative asset/(liability)	(85)	(299)
Level 2 | Recurring basis | Interest rate contracts
Fair Value of Derivatives
Long-term derivative assets	247	56
Current derivative liabilities	(240)	(425)
Long-term derivative liabilities	(102)	(241)
Total net derivative asset/(liability)	(95)	(610)
Level 2 | Recurring basis | Commodity contracts
Fair Value of Derivatives
Current derivative assets	37	33
Long-term derivative assets	27	24
Current derivative liabilities	(25)	(18)
Long-term derivative liabilities	(7)	(8)
Total net derivative asset/(liability)	32	31
Level 2 | Recurring basis | Other contracts
Fair Value of Derivatives
Current derivative assets	2
Long-term derivative assets	2
Current derivative liabilities		(4)
Total net derivative asset/(liability)	4	(4)
Level 3 | Recurring basis
Fair Value of Derivatives
Current derivative assets	66	67
Long-term derivative assets	12	14
Current derivative liabilities	(145)	(223)
Long-term derivative liabilities	(52)	(49)
Total net derivative asset/(liability)	(119)	(191)
Level 3 | Recurring basis | Foreign exchange contracts
Fair Value of Derivatives
Current 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 | Recurring basis | Interest rate contracts
Fair Value of Derivatives
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 | Recurring basis | Commodity contracts
Fair Value of Derivatives
Current derivative assets	66	67
Long-term derivative assets	12	14
Current derivative liabilities	(145)	(223)
Long-term derivative liabilities	(52)	(49)
Total net derivative asset/(liability)	(119)	(191)
Level 3 | Recurring basis | Other contracts
Fair Value of Derivatives
Current derivative assets	0
Long-term derivative assets	0
Current derivative liabilities		0
Total net derivative asset/(liability)	$ 0	$ 0

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