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Financial Instruments - Carrying amounts and classifications of financial assets and liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]    
Cash equivalents $ 0 $ 0
Financial liabilities 3,267 3,361
Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 689 599
Accounts payable and accrued liabilities | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 689 599
Dividends payable    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 62 59
Dividends payable | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 62 59
Credit facilities, long-term debt and lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 3,267 3,361
Credit facilities, long-term debt and lease liabilities | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 3,267 3,361
Exchangeable securities (Note 25)    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 735 730
Exchangeable securities (Note 25) | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 735 730
Within one year | Risk management liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 261 94
Within one year | Derivatives | Risk management liabilities | Hedging Liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 0 10
Within one year | Derivatives | Risk management liabilities | Trading securities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 261 84
Later than one year | Risk management liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 145 68
Later than one year | Derivatives | Risk management liabilities | Hedging Liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 0 0
Later than one year | Derivatives | Risk management liabilities | Trading securities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 145 68
Cash and cash equivalents    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 947 703
Cash and cash equivalents | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 947 703
Restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 70 71
Restricted cash | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 70 71
Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 651 583
Trade and other receivables | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 651 583
Long-term portion of finance lease receivable    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 185 228
Long-term portion of finance lease receivable | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 185 228
Risk management assets | Within one year    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 308 171
Risk management assets | Later than one year    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 399 521
Risk management assets | Hedging Asset | Within one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 36 102
Risk management assets | Hedging Asset | Later than one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 252 471
Risk management assets | Trading securities | Within one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 272 69
Risk management assets | Trading securities | Later than one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets $ 147 50
Other assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets   52
Other assets | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets   $ 52