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Income Taxes - Movement of Deferred Tax Assets and Liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | $ 5,042 | $ 5,172
Acquired in business combination | 4 | 0
Disposals | 0 | 0
Recognized in income | (311) | (470)
Deferred income tax expenses (recoveries) | (885) | 326
Recognized in equity | 5 | 4
Translation and other | 139 | 10
Ending balance | 3,994 | 5,042
Loss carryforwards |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | 670 | 701
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | 180 | (18)
Deferred income tax expenses (recoveries) | 0 | 0
Recognized in equity | (13) | (8)
Translation and other | 14 | (5)
Ending balance | 851 | 670
Actuarial liabilities |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | 5,813 | 4,507
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | (972) | 188
Deferred income tax expenses (recoveries) | (1,059) | 1,198
Recognized in equity | (1) | 0
Translation and other | 383 | (80)
Ending balance | 4,164 | 5,813
Pensions and post-employment benefits |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | 171 | 142
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | 1 | 4
Deferred income tax expenses (recoveries) | (20) | 26
Recognized in equity | 0 | 0
Translation and other | 1 | (1)
Ending balance | 153 | 171
Tax credits |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | 122 | 109
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | 109 | 15
Deferred income tax expenses (recoveries) | 0 | 0
Recognized in equity | 0 | 0
Translation and other | 7 | (2)
Ending balance | 238 | 122
Accrued interest |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | 1 | 1
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | 4 | 0
Deferred income tax expenses (recoveries) | 0 | 0
Recognized in equity | 0 | 0
Translation and other | 0 | 0
Ending balance | 5 | 1
Real estate |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | (1,135) | (1,317)
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | 214 | 168
Deferred income tax expenses (recoveries) | 1 | 0
Recognized in equity | 0 | 0
Translation and other | (50) | 14
Ending balance | (970) | (1,135)
Lease liability |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | 38 | 47
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | 7 | (7)
Deferred income tax expenses (recoveries) | 0 | 0
Recognized in equity | 1 | 0
Translation and other | (1) | (2)
Ending balance | 45 | 38
Right of use asset and sublease receivable |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | (34) | (41)
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | (8) | 7
Deferred income tax expenses (recoveries) | 0 | 0
Recognized in equity | (1) | 0
Translation and other | 0 | 0
Ending balance | (43) | (34)
Securities and other investments |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | 86 | 1,560
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | 276 | (293)
Deferred income tax expenses (recoveries) | 197 | (1,245)
Recognized in equity | 2 | 2
Translation and other | (171) | 62
Ending balance | 390 | 86
Sale of investments |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | (18) | (30)
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | 10 | 12
Deferred income tax expenses (recoveries) | 0 | 0
Recognized in equity | 0 | 0
Translation and other | 0 | 0
Ending balance | (8) | (18)
Goodwill and intangible assets |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | (822) | (828)
Acquired in business combination | 0 | 0
Disposals | 0 | 0
Recognized in income | 24 | (12)
Deferred income tax expenses (recoveries) | 0 | 0
Recognized in equity | 0 | 0
Translation and other | (31) | 18
Ending balance | (829) | (822)
Other |  |
Deferred Tax Assets And Liabilities [Roll Forward] |  |
Beginning balance | 150 | 321
Acquired in business combination | 4 | 0
Disposals | 0 | 0
Recognized in income | (156) | (534)
Deferred income tax expenses (recoveries) | (4) | 347
Recognized in equity | 17 | 10
Translation and other | (13) | 6
Ending balance | $ (2) | $ 150

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