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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Details of Derivative Instruments (Details)
shares in Millions
12 Months Ended
Jun. 22, 2020
CAD ($)
Dec. 31, 2021
CAD ($)
$ / shares
$ / $
shares
Dec. 31, 2021
USD ($)
$ / $
shares
Dec. 31, 2020
CAD ($)
$ / $
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / $
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 22, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Disclosure of detailed information about financial instruments [line items]                  
Net cash paid on settlement   $ (8,000,000)   $ 80,000,000          
Hedging effect, net proceeds received from issuances   550,000,000   2,540,000,000          
Payments to settle derivative   5,236,000,000   8,047,000,000          
Derivative financial assets outstanding   895,000,000   $ 1,011,000,000         $ 1,439,000,000
Senior Notes Due 2022                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount   $ 1,450,000,000              
Coupon rate   5.34%       5.34%      
Senior Notes Due 2022 | Floating interest rate                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount           $ 750,000,000   $ 750,000,000  
Spread on variable rate (as a percent)               0.60%  
Hedging effect, net proceeds received from issuances $ 1,019,000,000                
Debt derivatives                  
Disclosure of detailed information about financial instruments [line items]                  
Debt derivatives settled, exchange rate | $ / $       1.372 1.372        
Payments to settle derivative   $ 3,931,000,000   $ 6,826,000,000          
Outstanding bond forwards   (11,000,000)   12,000,000          
Derivative financial assets outstanding   1,121,000,000   1,086,000,000          
Debt derivatives | Credit facilities                  
Disclosure of detailed information about financial instruments [line items]                  
Debt derivatives entered, notional   $ 1,503,000,000 $ 1,200,000,000 $ 1,385,000,000 $ 970,000,000        
Debt derivatives entered, exchange rate | $ / $   1.253 1.253 1.428 1.428        
Debt derivatives settled, notional amount   $ 1,003,000,000 $ 800,000,000 $ 1,364,000,000 $ 970,000,000        
Debt derivatives settled, exchange rate | $ / $   1.254 1.254 1.406 1.406        
Net cash paid on settlement   $ (2,000,000)   $ (21,000,000)          
Debt derivatives | US commercial paper program                  
Disclosure of detailed information about financial instruments [line items]                  
Debt derivatives entered, notional   $ 3,235,000,000 $ 2,568,000,000 $ 4,406,000,000 $ 3,316,000,000        
Debt derivatives entered, exchange rate | $ / $   1.260 1.260 1.329 1.329        
Debt derivatives settled, notional amount   $ 2,911,000,000 $ 2,312,000,000 $ 5,441,000,000 $ 4,091,000,000        
Debt derivatives settled, exchange rate | $ / $   1.259 1.259 1.330 1.330        
Net cash paid on settlement   $ (15,000,000)   $ 101,000,000          
Debt derivatives | Senior Notes Due 2022 | Floating interest rate                  
Disclosure of detailed information about financial instruments [line items]                  
Coupon rate               0.955%  
Hedging effect, net proceeds received from issuances $ 1,019,000,000                
Expenditure derivatives                  
Disclosure of detailed information about financial instruments [line items]                  
Debt derivatives entered, notional   $ 545,000,000 $ 438,000,000 $ 2,095,000,000 $ 1,560,000,000        
Debt derivatives entered, exchange rate | $ / $   1.244 1.244 1.343 1.343        
Debt derivatives settled, notional amount   $ 1,306,000,000 $ 960,000,000 $ 1,221,000,000 $ 940,000,000        
Debt derivatives settled, exchange rate | $ / $   1.360 1.360 1.299 1.299        
Equity derivatives                  
Disclosure of detailed information about financial instruments [line items]                  
Net cash paid on settlement   $ 3,000,000   $ 1,000,000          
Payments to settle derivative   $ 0   $ 0          
Weighted average price of hedging instrument | $ / shares   60.98   56.08          
Derivative financial assets outstanding   $ 36,000,000   $ 34,000,000         55,000,000
Derivatives entered   $ 400,000   $ 300,000          
Number of derivatives settled (in shares) | shares   0.5 0.5 0.5 0.5        
Derivatives settled, weighted average price (in dollars per share) | $ / shares   $ 59.64   $ 54.16          
Equity derivatives | Class B Non-Voting Shares                  
Disclosure of detailed information about financial instruments [line items]                  
Weighted average price of hedging instrument | $ / shares   53.10   51.82          
Derivative financial assets outstanding   $ 5,000,000   $ 4,600,000          
Equity derivatives | Less than 1 year                  
Disclosure of detailed information about financial instruments [line items]                  
Weighted average price of hedging instrument | $ / shares   50.37              
Lease Liabilities                  
Disclosure of detailed information about financial instruments [line items]                  
Debt derivatives entered, notional   $ 168,000,000 $ 132,000,000 $ 158,000,000 $ 115,000,000        
Debt derivatives entered, exchange rate | $ / $   1.273 1.273 1.374 1.374        
Debt derivatives settled, notional amount   $ 108,000,000 $ 81,000,000 $ 59,000,000 $ 43,000,000        
Debt derivatives settled, exchange rate | $ / $   1.333 1.333            
Cash flow hedges | Debt derivatives                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount           11,200,000,000 $ 9,200,000,000    
Payments to settle derivative   $ 0   0          
Derivative financial assets outstanding   $ 1,110,000,000   $ 1,098,000,000         1,412,000,000
Cash flow hedges | Expenditure derivatives                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount           $ 1,068,000,000 $ 1,590,000,000    
Percent of derivatives designated as hedges   100.00%   100.00%   100.00% 100.00%    
Average foreign exchange rate | $ / $   1.287 1.287 1.342 1.342        
Payments to settle derivative   $ 1,305,000,000   $ 1,221,000,000          
Outstanding bond forwards   $ 19,000,000              
Derivative financial assets outstanding       $ (109,000,000)         $ 1,000,000
Cash flow hedges | Lease Liabilities                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount           $ 193,000,000 $ 142,000,000    
Average foreign exchange rate | $ / $   1.301 1.301 1.352 1.352