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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Total Derivative Instruments (Details) - CAD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) $ 5 $ (546)
Derivative liabilities, Total Net Derivative Instruments 5 (546)
Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) (326) (1,476)
Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) 350 816
Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) (19) 114
Other current assets    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 632 1,015
Derivative assets, Amounts Available for Offset (148) (223)
Derivative assets, Total Net Derivative Instruments 484 792
Other current assets | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 387 366
Other current assets | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 205 649
Other current assets | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 40 0
Deferred amounts and other assets    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 459 627
Derivative assets, Amounts Available for Offset (163) (163)
Derivative assets, Total Net Derivative Instruments 296 464
Deferred amounts and other assets | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 244 216
Deferred amounts and other assets | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 198 255
Deferred amounts and other assets | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 17 156
Other current liabilities    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (348) (898)
Derivative liabilities, Amounts Available for Offset 148 223
Derivative liabilities, Total Net Derivative Instruments (200) (675)
Other current liabilities | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (264) (808)
Other current liabilities | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (37) (48)
Other current liabilities | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (47) (42)
Other long-term liabilities    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (738) (1,290)
Derivative liabilities, Amounts Available for Offset 163 163
Derivative liabilities, Total Net Derivative Instruments (575) (1,127)
Other long-term liabilities | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (693) (1,250)
Other long-term liabilities | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (16) (40)
Other long-term liabilities | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (29) 0
Foreign exchange contracts    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) (395) (1,327)
Derivative liabilities, Total Net Derivative Instruments (395) (1,327)
Foreign exchange contracts | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) (376) (1,441)
Foreign exchange contracts | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) 0 $ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other Liabilities, Noncurrent
Foreign exchange contracts | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) (19) $ 114
Foreign exchange contracts | Other current assets    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 129 46
Derivative assets, Amounts Available for Offset (16) (41)
Derivative assets, Total Net Derivative Instruments 113 5
Foreign exchange contracts | Other current assets | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 89 46
Foreign exchange contracts | Other current assets | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 0 0
Foreign exchange contracts | Other current assets | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 40 0
Foreign exchange contracts | Deferred amounts and other assets    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 178 309
Derivative assets, Amounts Available for Offset (117) (138)
Derivative assets, Total Net Derivative Instruments 61 171
Foreign exchange contracts | Deferred amounts and other assets | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 161 153
Foreign exchange contracts | Deferred amounts and other assets | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 0 0
Foreign exchange contracts | Deferred amounts and other assets | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 17 156
Foreign exchange contracts | Other current liabilities    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (86) (566)
Derivative liabilities, Amounts Available for Offset 16 41
Derivative liabilities, Total Net Derivative Instruments (70) (525)
Foreign exchange contracts | Other current liabilities | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (39) (524)
Foreign exchange contracts | Other current liabilities | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities 0 0
Foreign exchange contracts | Other current liabilities | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (47) (42)
Foreign exchange contracts | Other long-term liabilities    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (616) (1,116)
Derivative liabilities, Amounts Available for Offset 117 138
Derivative liabilities, Total Net Derivative Instruments (499) (978)
Foreign exchange contracts | Other long-term liabilities | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (587) (1,116)
Foreign exchange contracts | Other long-term liabilities | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities 0 0
Foreign exchange contracts | Other long-term liabilities | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (29) 0
Interest rate contracts    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities   (4)
Total net financial asset/(liability) 465 910
Derivative liabilities, Total Net Derivative Instruments 465 $ 910
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other Liabilities, Noncurrent
Interest rate contracts | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities   $ (1)
Total net financial asset/(liability) 66 $ 10
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other Liabilities, Noncurrent
Interest rate contracts | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities   $ (3)
Total net financial asset/(liability) 399 900
Interest rate contracts | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities   0
Total net financial asset/(liability) 0 $ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other Liabilities, Noncurrent
Interest rate contracts | Other current assets    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 263 $ 660
Derivative assets, Amounts Available for Offset (2) 0
Derivative assets, Total Net Derivative Instruments 261 660
Interest rate contracts | Other current assets | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 58 11
Interest rate contracts | Other current assets | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 205 649
Interest rate contracts | Other current assets | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 0 0
Interest rate contracts | Deferred amounts and other assets    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 213 254
Derivative assets, Amounts Available for Offset (5) 0
Derivative assets, Total Net Derivative Instruments 208 254
Interest rate contracts | Deferred amounts and other assets | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 15 0
Interest rate contracts | Deferred amounts and other assets | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 198 254
Interest rate contracts | Deferred amounts and other assets | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 0 0
Interest rate contracts | Other current liabilities    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (2)  
Derivative liabilities, Amounts Available for Offset 2  
Derivative liabilities, Total Net Derivative Instruments 0  
Interest rate contracts | Other current liabilities | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (2)  
Interest rate contracts | Other current liabilities | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities 0  
Interest rate contracts | Other current liabilities | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities 0  
Interest rate contracts | Other long-term liabilities    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (9)  
Derivative liabilities, Amounts Available for Offset 5 0
Derivative liabilities, Total Net Derivative Instruments (4) (4)
Interest rate contracts | Other long-term liabilities | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (5)  
Interest rate contracts | Other long-term liabilities | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (4)  
Interest rate contracts | Other long-term liabilities | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities 0  
Commodity contracts    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) (66) (139)
Derivative liabilities, Total Net Derivative Instruments (66) (139)
Commodity contracts | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) (17) (54)
Commodity contracts | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) (49) (85)
Commodity contracts | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Total net financial asset/(liability) 0 0
Commodity contracts | Other current assets    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 239 302
Derivative assets, Amounts Available for Offset (130) (182)
Derivative assets, Total Net Derivative Instruments 109 120
Commodity contracts | Other current assets | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 239 302
Commodity contracts | Other current assets | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 0 0
Commodity contracts | Other current assets | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 0 0
Commodity contracts | Deferred amounts and other assets    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 68 61
Derivative assets, Amounts Available for Offset (41) (25)
Derivative assets, Total Net Derivative Instruments 27 36
Commodity contracts | Deferred amounts and other assets | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 68 61
Commodity contracts | Deferred amounts and other assets | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 0 0
Commodity contracts | Deferred amounts and other assets | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 0 0
Commodity contracts | Other current liabilities    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (260) (332)
Derivative liabilities, Amounts Available for Offset 130 182
Derivative liabilities, Total Net Derivative Instruments (130) (150)
Commodity contracts | Other current liabilities | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (223) (284)
Commodity contracts | Other current liabilities | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (37) (48)
Commodity contracts | Other current liabilities | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities 0 0
Commodity contracts | Other long-term liabilities    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (113) (170)
Derivative liabilities, Amounts Available for Offset 41 25
Derivative liabilities, Total Net Derivative Instruments (72) (145)
Commodity contracts | Other long-term liabilities | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (101) (133)
Commodity contracts | Other long-term liabilities | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities (12) (37)
Commodity contracts | Other long-term liabilities | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative liabilities 0 0
Other contracts    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 1  
Total net financial asset/(liability) 1 10
Derivative assets, Amounts Available for Offset 0  
Derivative assets, Total Net Derivative Instruments 1  
Derivative liabilities, Total Net Derivative Instruments 1 10
Other contracts | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 1  
Total net financial asset/(liability) 1 9
Other contracts | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 0  
Total net financial asset/(liability) 0 1
Other contracts | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets 0  
Total net financial asset/(liability) $ 0 0
Other contracts | Other current assets    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets   7
Derivative assets, Amounts Available for Offset   0
Derivative assets, Total Net Derivative Instruments   7
Other contracts | Other current assets | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets   7
Other contracts | Other current assets | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets   0
Other contracts | Other current assets | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets   0
Other contracts | Deferred amounts and other assets    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets   3
Derivative assets, Amounts Available for Offset   0
Derivative assets, Total Net Derivative Instruments   3
Other contracts | Deferred amounts and other assets | Non-Qualifying Derivative Instruments    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets   2
Other contracts | Deferred amounts and other assets | Derivative Instruments Used as Cash Flow Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets   1
Other contracts | Deferred amounts and other assets | Derivative Instruments Used as Fair Value Hedges | Designated as hedging instrument    
TOTAL DERIVATIVE INSTRUMENTS    
Derivative assets   $ 0