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Intangible Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | $ 313 | $ 318
Ending balance | 256 | 313
Gross carrying amount |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 833 | 788
Additions | 9 | 14
Acquisition (Note 4) |  | 37
Disposals |  | (1)
Impairment (Note 7) | (17) |
Change in foreign exchange rates | (2) | (2)
Transfers | 4 | (3)
Ending balance | 827 | 833
Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (520) | (470)
Disposals |  | 1
Transfers |  | 0
Amortization | 51 | 51
Ending balance | (571) | (520)
Power sale contracts |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 146 | 143
Ending balance | 129 | 146
Power sale contracts | Gross carrying amount |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 269 | 250
Additions | 0 | 0
Acquisition (Note 4) |  | 37
Disposals |  | 0
Impairment (Note 7) | 0 |
Change in foreign exchange rates | 0 | (2)
Transfers | 0 | (16)
Ending balance | 269 | 269
Power sale contracts | Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (123) | (107)
Disposals |  | 0
Transfers |  | (1)
Amortization | 17 | 15
Ending balance | (140) | (123)
Software and other |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 140 | 132
Ending balance | 123 | 140
Software and other | Gross carrying amount |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 412 | 378
Additions | 0 | 0
Acquisition (Note 4) |  | 0
Disposals |  | (1)
Impairment (Note 7) | 0 |
Change in foreign exchange rates | (2) | 0
Transfers | 12 | 35
Ending balance | 422 | 412
Software and other | Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (272) | (246)
Disposals |  | 1
Transfers |  | (1)
Amortization | 27 | 28
Ending balance | (299) | (272)
Intangibles under development |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 3 | 11
Ending balance | 4 | 3
Intangibles under development | Gross carrying amount |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 3 | 11
Additions | 9 | 14
Acquisition (Note 4) |  | 0
Disposals |  | 0
Impairment (Note 7) | 0 |
Change in foreign exchange rates | 0 | 0
Transfers | 8 | (22)
Ending balance | 4 | 3
Intangibles under development | Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 0 | 0
Disposals |  | 0
Transfers |  | 0
Amortization | 0 | 0
Ending balance | 0 | 0
Coal rights |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 24 | 32
Ending balance | 0 | 24
Coal rights | Gross carrying amount |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 149 | 149
Additions | 0 | 0
Acquisition (Note 4) |  | 0
Disposals |  | 0
Impairment (Note 7) | (17) |
Change in foreign exchange rates | 0 | 0
Transfers | 0 | 0
Ending balance | 132 | 149
Coal rights | Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (125) | (117)
Disposals |  | 0
Transfers |  | 0
Amortization | 7 | 8
Ending balance | $ (132) | $ (125)

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