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Intangible Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | $ 223 | $ 252
Change in foreign exchange rates | 6 | (2)
Ending balance | 281 | 223
Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 875 | 868
Additions | 10 | 13
Acquisitions (Note 4) | 57 |
Change in foreign exchange rates | 13 | (5)
Asset impairment charges |  | (1)
Transfers | 22 | 0
Ending balance | 977 | 875
Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (652) | (616)
Change in foreign exchange rates | 7 | (2)
Transfers | (1) |
Amortization | 38 | 38
Ending balance | (696) | (652)
Power sale and other contracts |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 96 | 114
Ending balance | 155 | 96
Power sale and other contracts | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 270 | 272
Additions | 0 | 0
Acquisitions (Note 4) | 57 |
Change in foreign exchange rates | 5 | (2)
Asset impairment charges |  | 0
Transfers | 20 | 0
Ending balance | 352 | 270
Power sale and other contracts | Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (174) | (158)
Change in foreign exchange rates | 4 | (1)
Transfers | 0 |
Amortization | 19 | 17
Ending balance | (197) | (174)
Software |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 100 | 111
Ending balance | 121 | 100
Software | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 446 | 437
Additions | 0 | 0
Acquisitions (Note 4) | 0 |
Change in foreign exchange rates | 7 | (2)
Asset impairment charges |  | (1)
Transfers | 35 | 12
Ending balance | 488 | 446
Software | Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (346) | (326)
Change in foreign exchange rates | 3 | (1)
Transfers | (1) |
Amortization | 19 | 21
Ending balance | (367) | (346)
Intangibles under development |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 27 | 27
Ending balance | 5 | 27
Intangibles under development | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 27 | 27
Additions | 10 | 13
Acquisitions (Note 4) | 0 |
Change in foreign exchange rates | 1 | (1)
Asset impairment charges |  | 0
Transfers | (33) | (12)
Ending balance | 5 | 27
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 | 0
Transfers | 0 |
Amortization | 0 | 0
Ending balance | 0 | 0
Coal rights |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 0 | 0
Ending balance | 0 | 0
Coal rights | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 132 | 132
Additions | 0 | 0
Acquisitions (Note 4) | 0 |
Change in foreign exchange rates | 0 | 0
Asset impairment charges |  | 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) | (132)
Change in foreign exchange rates | 0 | 0
Transfers | 0 |
Amortization | 0 | 0
Ending balance | $ (132) | $ (132)

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from transfers. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e&doctype=Standard -URIDate 2024-03-27 + Details
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