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Financial Instruments - Carrying amounts and classifications of financial assets and liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Cash equivalents $ 0 $ 0
Financial liabilities 3,361 3,212
Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 599 413
Accounts payable and accrued liabilities | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 599 413
Dividends payable    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 59 37
Dividends payable | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 59 37
Credit facilities, long-term debt and lease liabilities(2)    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 3,361 3,212
Credit facilities, long-term debt and lease liabilities(2) | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 3,361 3,212
Exchangeable securities (Note 25)    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 730 326
Exchangeable securities (Note 25) | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 730 326
Within one year | Risk management liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 94 81
Within one year | Derivatives | Risk management liabilities | Trading securities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 84 80
Within one year | Derivatives | Risk management liabilities | Hedging Liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 10 1
Later than one year | Risk management liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 68 29
Later than one year | Derivatives | Risk management liabilities | Trading securities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 68 28
Later than one year | Derivatives | Risk management liabilities | Hedging Liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 0 1
Cash and cash equivalents    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 703 411
Cash and cash equivalents | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 703 411
Restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 71 32
Restricted cash | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 71 32
Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 583 462
Trade and other receivables | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 583 462
Long-term portion of finance lease receivable    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 228 176
Long-term portion of finance lease receivable | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 228 176
Risk management assets | Within one year    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 171 166
Risk management assets | Later than one year    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 521 640
Risk management assets | Hedging Asset | Within one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 102 71
Risk management assets | Hedging Asset | Later than one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 471 607
Risk management assets | Trading securities | Within one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 69 95
Risk management assets | Trading securities | Later than one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 50 33
Other assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 52 47
Other assets | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets $ 52 $ 47