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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