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Insurance Contracts - CSM and Insurance Revenue by Transition Method (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Insurance revenue $ 2,704 $ 1,592
Insurance    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Insurance contracts liability (asset) at beginning of period 135,485 131,219
Loss recoveries at initial recognition of onerous underlying contracts 119 70
Contracts initially recognized in the year 119 70
Insurance finance (income) expenses from insurance contracts issued 5,139 9,675
Insurance contracts liability (asset) at end of period 146,914 135,485
Insurance revenue 5,520 4,401
Insurance | Contracts held at transition measured using the fair value approach    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Insurance contracts liability (asset) at beginning of period 9,701 10,205
CSM recognized for services provided (906) (822)
Changes in estimates that adjust CSM 506 703
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued (147) (39)
Foreign currency translation 329 (85)
Dispositions 0 (261)
Insurance contracts liability (asset) at end of period 9,483 9,701
Insurance revenue 5,765 5,716
Insurance | All other contracts    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Insurance contracts liability (asset) at beginning of period 2,144 765
CSM recognized for services provided (211) (101)
Changes in estimates that adjust CSM (32) 211
Contracts initially recognized in the year 1,448 1,259
Insurance finance (income) expenses from insurance contracts issued 50 31
Foreign currency translation 146 (21)
Dispositions 0 0
Insurance contracts liability (asset) at end of period 3,545 2,144
Insurance revenue 16,872 15,640
Reinsurance contracts held    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Insurance contracts liability (asset) at beginning of period (4,171) (4,512)
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued 51 59
Insurance contracts liability (asset) at end of period (4,493) (4,171)
Insurance revenue 504 (181)
Reinsurance contracts held | Contracts held at transition measured using the fair value approach    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Insurance contracts liability (asset) at beginning of period 146 175
CSM recognized for services provided 7 (11)
Changes in estimates that adjust CSM (344) (22)
Loss recoveries at initial recognition of onerous underlying contracts 0 0
Changes in estimates that relate to losses and reversals of losses on groups of underlying contracts (39) 3
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued 0 2
Foreign currency translation 7 (2)
Dispositions 0 1
Insurance contracts liability (asset) at end of period (223) 146
Reinsurance contracts held | All other contracts    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Insurance contracts liability (asset) at beginning of period (87) (70)
CSM recognized for services provided 11 7
Changes in estimates that adjust CSM (16) 6
Loss recoveries at initial recognition of onerous underlying contracts 44 35
Changes in estimates that relate to losses and reversals of losses on groups of underlying contracts (8) (7)
Contracts initially recognized in the year (64) (57)
Insurance finance (income) expenses from insurance contracts issued (1) (1)
Foreign currency translation 6 0
Dispositions 0 0
Insurance contracts liability (asset) at end of period $ (115) $ (87)