XML 110 R93.htm IDEA: XBRL DOCUMENT v3.20.4
FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Derivative Instruments - Net Asset (Liability) Position (Details)
$ in Millions, $ in Millions
Dec. 31, 2020
CAD ($)
$ / $
Dec. 31, 2020
USD ($)
$ / $
Dec. 31, 2019
CAD ($)
$ / $
Dec. 31, 2019
USD ($)
$ / $
Dec. 31, 2018
CAD ($)
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets $ 1,011   $ 1,439   $ 1,500
Debt derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 1,086   1,383    
Notional amount, liabilities $ 583 $ 449 $ 1,618 $ 1,223  
Exchange rate, liabilities | $ / $ 1.2995 1.2995 1.3227 1.3227  
Fair value, liabilities $ (12)   $ (29)    
Debt derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets $ 4,912 $ 4,550 $ 6,587 $ 5,800  
Exchange rate, assets | $ / $ 1.0795 1.0795 1.1357 1.1357  
Fair value, assets $ 1,098   $ 1,412   1,332
Notional amount, liabilities $ 6,201 $ 4,642 $ 3,409 $ 2,570  
Exchange rate, liabilities | $ / $ 1.3359 1.3359 1.3263 1.3263  
Expenditure derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets     $ 335 $ 270  
Exchange rate, assets | $ / $     1.2391 1.2391  
Fair value, assets     $ 1   122
Notional amount, liabilities $ 2,134 $ 1,590 $ 952 $ 720  
Exchange rate, liabilities | $ / $ 1.3421 1.3421 1.3228 1.3228  
Fair value, liabilities $ (109)        
Equity derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets 238   $ 223    
Fair value, assets 34   55   92
Before Offset Amount          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 1,439   1,579    
Fair value, liabilities (428)   (140)    
Before Offset Amount | Debt derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 0   0   $ 41
Fair value, liabilities (12)   (29)    
Before Offset Amount | Debt derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 1,405   1,508    
Fair value, liabilities (307)   (96)    
Before Offset Amount | Expenditure derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 0   16    
Fair value, liabilities (109)   (15)    
Before Offset Amount | Equity derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 34   55    
Fair value, liabilities $ 0   $ 0