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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - FAIR VALUE OF DERIVATIVES (Details) - CAD
CAD in Millions
Jun. 30, 2017
Dec. 31, 2016
Fair Value of Derivatives    
Total net derivative asset/(liability) CAD (3,132) CAD (4,150)
Foreign exchange contracts    
Fair Value of Derivatives    
Total net derivative asset/(liability) (2,162) (2,842)
Interest rate contracts    
Fair Value of Derivatives    
Total net derivative asset/(liability) (890) (1,045)
Commodity contracts    
Fair Value of Derivatives    
Total net derivative asset/(liability) (71) (261)
Other contracts    
Fair Value of Derivatives    
Total net derivative asset/(liability) (9) (2)
Recurring basis    
Fair Value of Derivatives    
Current derivative assets 266 353
Long-term derivative assets 181 151
Current derivative liabilities (1,378) (1,941)
Long-term derivative liabilities (2,201) (2,713)
Total net derivative asset/(liability) (3,132) (4,150)
Recurring basis | Foreign exchange contracts    
Fair Value of Derivatives    
Current derivative assets 69 109
Long-term derivative assets 120 73
Current derivative liabilities (784) (995)
Long-term derivative liabilities (1,567) (2,029)
Total net derivative asset/(liability) (2,162) (2,842)
Recurring basis | Interest rate contracts    
Fair Value of Derivatives    
Current derivative assets 5 3
Long-term derivative assets 21 8
Current derivative liabilities (448) (583)
Long-term derivative liabilities (468) (473)
Total net derivative asset/(liability) (890) (1,045)
Recurring basis | Commodity contracts    
Fair Value of Derivatives    
Current derivative assets 192 241
Long-term derivative assets 40 68
Current derivative liabilities (139) (359)
Long-term derivative liabilities (164) (211)
Total net derivative asset/(liability) (71) (261)
Recurring basis | Other contracts    
Fair Value of Derivatives    
Long-term derivative assets   2
Current derivative liabilities (7) (4)
Long-term derivative liabilities (2)  
Total net derivative asset/(liability) (9) (2)
Level 1 | Recurring basis    
Fair Value of Derivatives    
Current derivative assets 7 2
Current derivative liabilities (4) (12)
Total net derivative asset/(liability) 3 (10)
Level 1 | Recurring basis | Commodity contracts    
Fair Value of Derivatives    
Current derivative assets 7 2
Current derivative liabilities (4) (12)
Total net derivative asset/(liability) 3 (10)
Level 2 | Recurring basis    
Fair Value of Derivatives    
Current derivative assets 142 198
Long-term derivative assets 146 126
Current derivative liabilities (1,276) (1,657)
Long-term derivative liabilities (2,043) (2,512)
Total net derivative asset/(liability) (3,031) (3,845)
Level 2 | Recurring basis | Foreign exchange contracts    
Fair Value of Derivatives    
Current derivative assets 69 109
Long-term derivative assets 120 73
Current derivative liabilities (784) (995)
Long-term derivative liabilities (1,567) (2,029)
Total net derivative asset/(liability) (2,162) (2,842)
Level 2 | Recurring basis | Interest rate contracts    
Fair Value of Derivatives    
Current derivative assets 5 3
Long-term derivative assets 21 8
Current derivative liabilities (448) (583)
Long-term derivative liabilities (468) (473)
Total net derivative asset/(liability) (890) (1,045)
Level 2 | Recurring basis | Commodity contracts    
Fair Value of Derivatives    
Current derivative assets 68 86
Long-term derivative assets 5 43
Current derivative liabilities (37) (75)
Long-term derivative liabilities (6) (10)
Total net derivative asset/(liability) 30 44
Level 2 | Recurring basis | Other contracts    
Fair Value of Derivatives    
Long-term derivative assets   2
Current derivative liabilities (7) (4)
Long-term derivative liabilities (2)  
Total net derivative asset/(liability) (9) (2)
Level 3 | Recurring basis    
Fair Value of Derivatives    
Current derivative assets 117 153
Long-term derivative assets 35 25
Current derivative liabilities (98) (272)
Long-term derivative liabilities (158) (201)
Total net derivative asset/(liability) (104) (295)
Level 3 | Recurring basis | Commodity contracts    
Fair Value of Derivatives    
Current derivative assets 117 153
Long-term derivative assets 35 25
Current derivative liabilities (98) (272)
Long-term derivative liabilities (158) (201)
Total net derivative asset/(liability) CAD (104) CAD (295)