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Insurance Contracts - CSM and Insurance Revenue by Transition Method (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Insurance revenue $ 1,592 $ (2,516)
Insurance    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Net balances, beginning of year 131,219 149,250
Loss recoveries at initial recognition of onerous underlying contracts 70 91
Contracts initially recognized in the year 70 91
Insurance finance (income) expenses from insurance contracts issued 9,675 (22,595)
Net balances, end of year 135,485 131,219
Insurance revenue 4,401 (22,818)
Insurance | Contracts held at transition measured using the fair value approach    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Net balances, beginning of year 10,205 9,886
CSM recognized for services provided (822) (843)
Experience adjustments 0 0
Changes in estimates that adjust CSM 703 1,274
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued (39) (352)
Foreign currency translation (85) 240
Dispositions (261) 0
Net balances, end of year 9,701 10,205
Insurance revenue 5,716 5,892
Insurance | All other contracts    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Net balances, beginning of year 765 18
CSM recognized for services provided (101) (28)
Experience adjustments 0 0
Changes in estimates that adjust CSM 211 (141)
Contracts initially recognized in the year 1,259 894
Insurance finance (income) expenses from insurance contracts issued 31 5
Foreign currency translation (21) 17
Net balances, end of year 2,144 765
Insurance revenue 15,640 13,010
Reinsurance contracts held    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Net balances, beginning of year 4,512 4,618
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued 59 (440)
Net balances, end of year 4,171 4,512
Insurance revenue (181) (218)
Reinsurance contracts held | Contracts held at transition measured using the fair value approach    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Net balances, beginning of year 175 107
CSM recognized for services provided (11) (13)
Experience adjustments 0 0
Changes in estimates that adjust CSM (22) 81
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 3 (9)
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued 2 1
Foreign currency translation (2) 8
Dispositions 1 0
Net balances, end of year 146 175
Reinsurance contracts held | All other contracts    
Disclosure of reconciliation of changes in insurance contracts by components [abstract]    
Net balances, beginning of year (70) 0
CSM recognized for services provided 7 3
Experience adjustments 0 0
Changes in estimates that adjust CSM 6 (25)
Loss recoveries at initial recognition of onerous underlying contracts 35 23
Changes in estimates that relate to losses and reversals of losses on groups of underlying contracts (7) (14)
Contracts initially recognized in the year (57) (58)
Insurance finance (income) expenses from insurance contracts issued (1) 0
Foreign currency translation 0 1
Net balances, end of year $ (87) $ (70)