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Intangible Assets (Details) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Impairment loss $ 70      
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   $ 318 $ 373  
Ending balance   313 318 $ 373
Gross carrying amount        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   788 807  
Additions   14 14  
Acquisition   37 16  
Disposals (Note 4(R))     (38)  
Change in foreign exchange rates   (2) (6)  
Transfers   (3) 0  
Disposals   (1)    
Ending balance   833 788 807
Gross carrying amount | IFRS 16        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance     5  
Ending balance       5
Accumulated amortization        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   (470) (434)  
Disposals (Note 4(R))     10  
Change in foreign exchange rates     (1)  
Transfers   0 0  
Disposals   1    
Amortization   51 50  
Ending balance   (520) (470) (434)
Accumulated amortization | IFRS 16        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance     (3)  
Ending balance       (3)
Coal rights        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   32 68  
Ending balance   24 32 68
Coal rights | Gross carrying amount        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   149 185  
Additions   0 0  
Acquisition   0 0  
Disposals (Note 4(R))     (37)  
Change in foreign exchange rates   0 0  
Transfers   0 1  
Disposals   0    
Ending balance   149 149 185
Coal rights | Gross carrying amount | IFRS 16        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance     0  
Ending balance       0
Coal rights | Accumulated amortization        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   (117) (117)  
Disposals (Note 4(R))     9  
Change in foreign exchange rates     0  
Transfers   0 1  
Disposals   0    
Amortization   8 8  
Ending balance   (125) (117) (117)
Coal rights | Accumulated amortization | IFRS 16        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance     0  
Ending balance       0
Software and other        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   132 118  
Ending balance   140 132 118
Software and other | Gross carrying amount        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   378 339  
Additions   0 0  
Acquisition   0 1  
Disposals (Note 4(R))     (1)  
Change in foreign exchange rates   0 (4)  
Transfers   35 48  
Disposals   (1)    
Ending balance   412 378 339
Software and other | Gross carrying amount | IFRS 16        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance     5  
Ending balance       5
Software and other | Accumulated amortization        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   (246) (221)  
Disposals (Note 4(R))     1  
Change in foreign exchange rates     (1)  
Transfers   (1) (1)  
Disposals   1    
Amortization   28 31  
Ending balance   (272) (246) (221)
Software and other | Accumulated amortization | IFRS 16        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance     (3)  
Ending balance       (3)
Power sale contracts        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   143 141  
Ending balance   146 143 141
Power sale contracts | Gross carrying amount        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   250 237  
Additions   0 0  
Acquisition   37 0  
Disposals (Note 4(R))     0  
Change in foreign exchange rates   (2) (1)  
Transfers   (16) 14  
Disposals   0    
Ending balance   269 250 237
Power sale contracts | Gross carrying amount | IFRS 16        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance     0  
Ending balance       0
Power sale contracts | Accumulated amortization        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   (107) (96)  
Disposals (Note 4(R))     0  
Change in foreign exchange rates     0  
Transfers   1 0  
Disposals   0    
Amortization   15 11  
Ending balance   (123) (107) (96)
Power sale contracts | Accumulated amortization | IFRS 16        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance     0  
Ending balance       0
Intangibles under development        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   11 46  
Ending balance   3 11 46
Intangibles under development | Gross carrying amount        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   11 46  
Additions   14 14  
Acquisition   0 15  
Disposals (Note 4(R))     0  
Change in foreign exchange rates   0 (1)  
Transfers   22 (63)  
Disposals   0    
Ending balance   3 11 46
Intangibles under development | Gross carrying amount | IFRS 16        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance     0  
Ending balance       0
Intangibles under development | Accumulated amortization        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance   0 0  
Disposals (Note 4(R))     0  
Change in foreign exchange rates     0  
Transfers   0 0  
Disposals   0    
Amortization   0 0  
Ending balance   $ 0 0 0
Intangibles under development | Accumulated amortization | IFRS 16        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Beginning balance     $ 0  
Ending balance       0
Lakeswind        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Impairment loss       12
Lakeswind | Intangible assets        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Impairment loss       $ 1