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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Fair Value of Derivatives (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CAD ($)
Disclosure of detailed information about financial instruments [line items]          
Derivative financial assets $ 1,500   $ 1,094   $ 1,659
Proceeds received from settlement of derivatives (22,222)   (13,215)    
Payment on derivatives entered 21,834   13,321    
(Decrease) increase in fair value of derivatives 794   (671)    
Debt derivatives          
Disclosure of detailed information about financial instruments [line items]          
Derivative financial liabilities     (23)   0
Derivative financial assets 1,373   1,129    
Proceeds received from settlement of derivatives (19,368)   (12,002)    
Payment on derivatives entered 19,305   12,081    
(Decrease) increase in fair value of derivatives 127   (102)    
Expenditure derivatives          
Disclosure of detailed information about financial instruments [line items]          
Debt derivatives entered, notional   $ 840   $ 930  
Equity derivatives          
Disclosure of detailed information about financial instruments [line items]          
Derivative financial assets 92   68   8
Proceeds received from settlement of derivatives (4)   (6)    
Payment on derivatives entered 0   0    
(Decrease) increase in fair value of derivatives 28   66    
Cash flow hedges | Debt derivatives          
Disclosure of detailed information about financial instruments [line items]          
Derivative financial assets 1,332   1,152   1,683
Proceeds received from settlement of derivatives (1,761)   0    
Payment on derivatives entered 1,436   0    
(Decrease) increase in fair value of derivatives 505   (531)    
Cash flow hedges | Bond forward          
Disclosure of detailed information about financial instruments [line items]          
Derivative financial liabilities (87)   (64)   (51)
Proceeds received from settlement of derivatives 0   0    
Payment on derivatives entered 0   0    
(Decrease) increase in fair value of derivatives (23)   (13)    
Cash flow hedges | Expenditure derivatives          
Disclosure of detailed information about financial instruments [line items]          
Derivative financial liabilities 122        
Derivative financial assets (122)   (39)   $ 19
Proceeds received from settlement of derivatives (1,089)   (1,207)    
Debt derivatives entered, notional 1,093   1,240    
(Decrease) increase in fair value of derivatives 157   (91)    
Before Offset Amount          
Disclosure of detailed information about financial instruments [line items]          
Derivative financial liabilities (109)   (280)    
Derivative financial assets 1,609   1,374    
Before Offset Amount | Debt derivatives          
Disclosure of detailed information about financial instruments [line items]          
Derivative financial assets 41        
Before Offset Amount | Cash flow hedges | Debt derivatives          
Disclosure of detailed information about financial instruments [line items]          
Derivative financial liabilities (22)   (149)    
Derivative financial assets 1,354   1,301    
Before Offset Amount | Cash flow hedges | Expenditure derivatives          
Disclosure of detailed information about financial instruments [line items]          
Derivative financial liabilities     (44)    
Derivative financial assets $ 122   $ 5