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Intangible Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Jun. 28, 2018
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   $ 364 $ 355
Ending balance   373 364
Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   744 693
Additions   53 51
Retirements   (2)  
Change in foreign exchange rates   3 (3)
Transfers   9 3
Ending balance   807 744
Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   380 338
Retirements   (1)  
Change in foreign exchange rates   2 1
Transfers   3 0
Amortization   50 41
Ending balance   434 380
Coal rights      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   53 63
Ending balance   68 53
Coal rights | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   178 178
Additions   0 0
Retirements   0  
Change in foreign exchange rates   0 0
Transfers   7 0
Ending balance   185 178
Coal rights | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   125 115
Retirements   0  
Change in foreign exchange rates   0 0
Transfers   (17) 2
Amortization   9 8
Ending balance   117 125
Software and other      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   126 105
Ending balance   118 126
Software and other | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   314 268
Additions   0 31
Retirements   (2)  
Change in foreign exchange rates   3 (3)
Transfers   24 18
Ending balance   339 314
Software and other | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   188 163
Retirements   (1)  
Change in foreign exchange rates   2 1
Transfers   0 0
Amortization   32 24
Ending balance   221 188
Power sale contracts      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   156 163
Ending balance   141 156
Power sale contracts | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   223 223
Additions   0 0
Retirements   0  
Change in foreign exchange rates   0 0
Transfers   14 0
Ending balance   237 223
Power sale contracts | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   67 60
Retirements   0  
Change in foreign exchange rates   0 0
Transfers   20 2
Amortization   9 9
Ending balance   96 67
Intangibles under development      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   29 24
Ending balance   46 29
Intangibles under development | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   29 24
Additions   53 20
Retirements   0  
Change in foreign exchange rates   0 0
Transfers   36 (15)
Ending balance   46 29
Intangibles under development | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance   0 0
Retirements   0  
Change in foreign exchange rates   0 0
Transfers   0 0
Amortization   0 0
Ending balance   0 $ 0
US Wind Projects - Big Level [Member] | 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