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Intangible Assets (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about intangible assets [abstract] |  |  |
Project development costs | $ 10 | $ 29 | $ 25
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 256 | 313 |
Change in foreign exchange rates | 2 |  |
Transfers | (19) | 0 |
Ending balance | 252 | 256 |
Project development costs | 10 | 29 | $ 25
US Wind Projects |  |  |
Disclosure of detailed information about intangible assets [abstract] |  |  |
Project development costs | 19 |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Project development costs | 19 |  |
Cost |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 827 | 833 |
Additions | 31 | 9 |
Impairment charges |  | (17) |
Change in foreign exchange rates | 7 | (2) |
Transfers | 3 | 4 |
Ending balance | 868 | 827 |
Accumulated amortization |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | (571) | (520) |
Change in foreign exchange rates | 2 |  |
Amortization | 43 | 51 |
Ending balance | (616) | (571) |
Power sale contracts |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 129 | 146 |
Ending balance | 114 | 129 |
Power sale contracts | Cost |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 269 | 269 |
Additions | 0 | 0 |
Impairment charges |  | 0 |
Change in foreign exchange rates | 3 | 0 |
Transfers | 0 | 0 |
Ending balance | 272 | 269 |
Power sale contracts | Accumulated amortization |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | (140) | (123) |
Change in foreign exchange rates | 1 |  |
Amortization | 17 | 17 |
Ending balance | (158) | (140) |
Software and other |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 123 | 140 |
Ending balance | 111 | 123 |
Software and other | Cost |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 422 | 412 |
Additions | 0 | 0 |
Impairment charges |  | 0 |
Change in foreign exchange rates | 3 | (2) |
Transfers | 12 | 12 |
Ending balance | 437 | 422 |
Software and other | Accumulated amortization |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | (299) | (272) |
Change in foreign exchange rates | 1 |  |
Amortization | 26 | 27 |
Ending balance | (326) | (299) |
Intangibles under development |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 4 | 3 |
Ending balance | 27 | 4 |
Intangibles under development | Cost |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 4 | 3 |
Additions | 31 | 9 |
Impairment charges |  | 0 |
Change in foreign exchange rates | 1 | 0 |
Transfers | (9) | (8) |
Ending balance | 27 | 4 |
Intangibles under development | Accumulated amortization |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 0 | 0 |
Change in foreign exchange rates | 0 |  |
Amortization | 0 | 0 |
Ending balance | 0 | 0 |
Coal rights |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 0 | 24 |
Ending balance | 0 | 0 |
Coal rights | Cost |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | 132 | 149 |
Additions | 0 | 0 |
Impairment charges |  | (17) |
Change in foreign exchange rates | 0 | 0 |
Transfers | 0 | 0 |
Ending balance | 132 | 132 |
Coal rights | Accumulated amortization |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance | (132) | (125) |
Change in foreign exchange rates | 0 |  |
Amortization | 0 | 7 |
Ending balance | $ (132) | $ (132) |

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