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Cash Flow Information Changes in Liabilities from Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period $ 3,325 $ 3,741
Net cash flows 195 (626)
New leases 133 10
Tax shield on tax equity financing (35)  
Dividends declared 64 107
Foreign exchange impact (42) 95
Other (65) (2)
Balance at end of the period 3,575 3,325
Long-term debt and lease obligations    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 3,267 3,707
Net cash flows (70) (540)
New leases 133 10
Tax shield on tax equity financing (35)  
Dividends declared 0 0
Foreign exchange impact (42) 95
Other (41) (5)
Balance at end of the period 3,212 3,267
Exchangeable securities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 0  
Net cash flows 350  
New leases 0  
Tax shield on tax equity financing 0  
Dividends declared 0  
Foreign exchange impact 0  
Other (24)  
Balance at end of the period 326 0
Dividends payable (common and preferred)    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 58 34
Net cash flows (85) (86)
New leases 0 0
Tax shield on tax equity financing 0  
Dividends declared 64 107
Foreign exchange impact 0 0
Other 0 3
Balance at end of the period $ 37 $ 58