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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 |  |

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