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Cash Flow Information Changes in Liabilities from Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period $ 3,575 $ 3,325
Net cash flows 447 195
New leases 16 133
Tax shield on tax equity financing   (35)
Dividends declared 107 64
Foreign exchange impact 5 (42)
Other 0 (65)
Balance at end of the period 4,150 3,575
Long-term debt and lease obligations    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 3,212 3,267
Net cash flows 133 (70)
New leases 16 133
Tax shield on tax equity financing   (35)
Dividends declared 0 0
Foreign exchange impact 5 (42)
Other (5) (41)
Balance at end of the period 3,361 3,212
Exchangeable securities (Note 25)    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 326 0
Net cash flows 400 350
New leases 0 0
Tax shield on tax equity financing   0
Dividends declared 0 0
Foreign exchange impact 0 0
Other 4 (24)
Balance at end of the period 730 326
Dividends payable (common and preferred)    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance at beginning of the period 37 58
Net cash flows (86) (85)
New leases 0 0
Tax shield on tax equity financing   0
Dividends declared 107 64
Foreign exchange impact 0 0
Other 1 0
Balance at end of the period $ 59 $ 37