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Financial Instruments Carrying amounts and classifications of financial assets and liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Cash equivalents $ 0 $ 0
Financial liabilities 3,212 3,267
Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 413 496
Accounts payable and accrued liabilities | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 413 496
Dividends payable    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 37 58
Dividends payable | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 37 58
Credit facilities, long-term debt and finance lease obligations(2)    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 3,212 3,267
Credit facilities, long-term debt and finance lease obligations(2) | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 3,212 3,267
Exchangeable securities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 326  
Exchangeable securities | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 326  
Within one year | Risk management liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 81 90
Within one year | Derivatives | Risk management liabilities | Trading securities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 80 89
Within one year | Derivatives | Risk management liabilities | Hedging Liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 1 1
Later than one year | Risk management liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 29 41
Later than one year | Derivatives | Risk management liabilities | Trading securities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 28 40
Later than one year | Derivatives | Risk management liabilities | Hedging Liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 1 1
Cash and cash equivalents    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 411 89
Cash and cash equivalents | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 411 89
Restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 32 66
Restricted cash | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 32 66
Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 462 756
Trade and other receivables | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 462 731
Trade and other receivables | Other financial assets (FVTPL)    
Disclosure of detailed information about financial instruments [line items]    
Financial assets   25
Long-term portion of finance lease receivable    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 176 191
Long-term portion of finance lease receivable | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 176 191
Risk management assets | Within one year    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 166 146
Risk management assets | Later than one year    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 640 662
Risk management assets | Hedging Asset | Within one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 71 60
Risk management assets | Hedging Asset | Later than one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 607 629
Risk management assets | Trading securities | Within one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 95 86
Risk management assets | Trading securities | Later than one year | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 33 33
Other assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 47 52
Other assets | Amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Financial assets $ 47 37
Other assets | Other financial assets (FVTPL)    
Disclosure of detailed information about financial instruments [line items]    
Financial assets   $ 15