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Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Jun. 28, 2018
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   $ 373 $ 364
Ending balance   318 373
Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   807 744
Additions   14 53
Retirements and disposals(2)     (2)
Change in foreign exchange rates   (6) 3
Transfers   0 9
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18)   (5)  
Acquisition   16  
Disposals   (38)  
Ending balance   788 807
Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   434 380
Retirements and disposals(2)     1
Change in foreign exchange rates   (1) 2
Transfers   0 3
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18)   (3)  
Disposals   (10)  
Amortization   50 50
Ending balance   470 434
Coal rights      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   68 53
Ending balance   32 68
Coal rights | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   185 178
Additions   0 0
Retirements and disposals(2)     0
Change in foreign exchange rates   0 0
Transfers   1 7
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18)   0  
Acquisition   0  
Disposals   (37)  
Ending balance   149 185
Coal rights | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   117 125
Retirements and disposals(2)     0
Change in foreign exchange rates   0 0
Transfers   1 (17)
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18)   0  
Disposals   (9)  
Amortization   8 9
Ending balance   117 117
Software and other      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   118 126
Ending balance   132 118
Software and other | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   339 314
Additions   0 0
Retirements and disposals(2)     (2)
Change in foreign exchange rates   (4) 3
Transfers   48 24
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18)   (5)  
Acquisition   1  
Disposals   (1)  
Ending balance   378 339
Software and other | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   221 188
Retirements and disposals(2)     1
Change in foreign exchange rates   (1) 2
Transfers   (1) 0
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18)   (3)  
Disposals   (1)  
Amortization   31 32
Ending balance   246 221
Power sale contracts      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   141 156
Ending balance   143 141
Power sale contracts | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   237 223
Additions   0 0
Retirements and disposals(2)     0
Change in foreign exchange rates   (1) 0
Transfers   14 14
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18)   0  
Acquisition   0  
Disposals   0  
Ending balance   250 237
Power sale contracts | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   96 67
Retirements and disposals(2)     0
Change in foreign exchange rates   0 0
Transfers   0 (20)
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18)   0  
Disposals   0  
Amortization   11 9
Ending balance   107 96
Intangibles under development      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   46 29
Ending balance   11 46
Intangibles under development | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   46 29
Additions   14 53
Retirements and disposals(2)     0
Change in foreign exchange rates   (1) 0
Transfers   63 (36)
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18)   0  
Acquisition   15  
Disposals   0  
Ending balance   11 46
Intangibles under development | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   0 0
Retirements and disposals(2)     0
Change in foreign exchange rates   0 0
Transfers   0 0
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18)   0  
Disposals   0  
Amortization   0 0
Ending balance   0 $ 0
US Wind Projects - Big Level | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Additions   $ 33  
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