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Insurance Contracts - Contractual Service Margin (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Insurance    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
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)
Foreign currency translation (1,194) 3,330
Dispositions (Note 3) (4,809)  
Net balances, end of year 135,485 131,219
Insurance | Canada    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 74,435 84,283
Net balances, end of year 82,436 74,435
Insurance | U.S.    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 25,158 28,826
Net balances, end of year 24,540 25,158
Insurance | Asia    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 27,362 29,903
Net balances, end of year 28,433 27,362
Insurance | Corporate    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 4,264 6,238
Net balances, end of year 76 4,264
Insurance | CSM    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contracts initially recognized in the year 1,259 894
Insurance | non-PAA    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 114,296 131,855
CSM recognized for services provided (923) (871)
Changes in estimates that adjust CSM 0 0
Contracts initially recognized in the year 70 91
Insurance finance (income) expenses from insurance contracts issued 8,648 (21,181)
Foreign currency translation (1,058) 3,093
Dispositions (Note 3) (4,238) 0
Net balances, end of year 118,221 114,296
Insurance | non-PAA | Canada    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 62,655 71,811
Net balances, end of year 69,990 62,655
Insurance | non-PAA | U.S.    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 20,091 23,980
Net balances, end of year 19,749 20,091
Insurance | non-PAA | Asia    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 27,286 29,826
Net balances, end of year 28,406 27,286
Insurance | non-PAA | Corporate    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 4,264 6,238
Net balances, end of year 76 4,264
Insurance | non-PAA | CSM    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 10,970 9,904
CSM recognized for services provided (923) (871)
Changes in estimates that adjust CSM 914 1,133
Contracts initially recognized in the year 1,259 894
Insurance finance (income) expenses from insurance contracts issued (8) (347)
Foreign currency translation (106) 257
Dispositions (Note 3) (261) 0
Net balances, end of year 11,845 10,970
Insurance | non-PAA | CSM | Canada    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 5,481 5,346
CSM recognized for services provided (432) (398)
Changes in estimates that adjust CSM 492 419
Contracts initially recognized in the year 552 443
Insurance finance (income) expenses from insurance contracts issued (31) (329)
Foreign currency translation 0 0
Dispositions (Note 3) 0  
Net balances, end of year 6,062 5,481
Insurance | non-PAA | CSM | U.S.    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 1,296 1,201
CSM recognized for services provided (116) (111)
Changes in estimates that adjust CSM (128) 105
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued 20 9
Foreign currency translation (29) 92
Dispositions (Note 3) 119  
Net balances, end of year 1,162 1,296
Insurance | non-PAA | CSM | Asia    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 3,811 3,054
CSM recognized for services provided (365) (326)
Changes in estimates that adjust CSM 555 483
Contracts initially recognized in the year 707 451
Insurance finance (income) expenses from insurance contracts issued 4 (21)
Foreign currency translation (91) 170
Dispositions (Note 3) 0  
Net balances, end of year 4,621 3,811
Insurance | non-PAA | CSM | Corporate    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 382 303
CSM recognized for services provided (10) (36)
Changes in estimates that adjust CSM (5) 126
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued (1) (6)
Foreign currency translation 14 (5)
Dispositions (Note 3) (380)  
Net balances, end of year 0 382
Reinsurance contracts held    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
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)
Foreign currency translation (171) 375
Dispositions (Note 3) (120)  
Net balances, end of year 4,171 4,512
Reinsurance contracts held | Canada    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 135 113
Net balances, end of year 125 135
Reinsurance contracts held | U.S.    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 4,104 4,512
Net balances, end of year 4,083 4,104
Reinsurance contracts held | Asia    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 207 (73)
Net balances, end of year (37) 207
Reinsurance contracts held | Corporate    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 66 66
Net balances, end of year 0 66
Reinsurance contracts held | CSM    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Contracts initially recognized in the year (57) (58)
Reinsurance contracts held | non-PAA    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year (4,112) (4,181)
CSM recognized for services provided (4) (10)
Changes in estimates that adjust CSM 0 0
Changes in estimates that relate to losses and reversals of losses on groups of underlying contracts 13 (2)
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued 45 (418)
Foreign currency translation (97) 406
Dispositions (Note 3) (33) 0
Net balances, end of year (3,830) (4,112)
Reinsurance contracts held | non-PAA | Canada    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 42 83
Net balances, end of year 27 42
Reinsurance contracts held | non-PAA | U.S.    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year (3,882) (4,272)
Net balances, end of year (3,898) (3,882)
Reinsurance contracts held | non-PAA | Asia    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year (206) 74
Net balances, end of year 41 (206)
Reinsurance contracts held | non-PAA | Corporate    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year (66) (66)
Net balances, end of year 0 (66)
Reinsurance contracts held | non-PAA | CSM    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year (105) (107)
CSM recognized for services provided (4) (10)
Changes in estimates that adjust CSM (16) 56
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 (4) (23)
Contracts initially recognized in the year (57) (58)
Insurance finance (income) expenses from insurance contracts issued 1 1
Foreign currency translation (2) 9
Dispositions (Note 3) 1 0
Net balances, end of year (59) (105)
Reinsurance contracts held | non-PAA | CSM | Canada    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year (20) 12
CSM recognized for services provided 0 (1)
Changes in estimates that adjust CSM 78 23
Loss recoveries at initial recognition of onerous underlying contracts 34 23
Changes in estimates that relate to losses and reversals of losses on groups of underlying contracts (3) (14)
Contracts initially recognized in the year (57) (63)
Insurance finance (income) expenses from insurance contracts issued 0 0
Foreign currency translation 0 0
Dispositions (Note 3) 0  
Net balances, end of year 32 (20)
Reinsurance contracts held | non-PAA | CSM | U.S.    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 128 111
CSM recognized for services provided (7) (10)
Changes in estimates that adjust CSM (113) 39
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 0 (22)
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued 1 1
Foreign currency translation 0 9
Dispositions (Note 3) 0  
Net balances, end of year 9 128
Reinsurance contracts held | non-PAA | CSM | Asia    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year (7) (3)
CSM recognized for services provided 1 (2)
Changes in estimates that adjust CSM 26 (20)
Loss recoveries at initial recognition of onerous underlying contracts 1 0
Changes in estimates that relate to losses and reversals of losses on groups of underlying contracts (1) 13
Contracts initially recognized in the year 0 5
Insurance finance (income) expenses from insurance contracts issued 0 0
Foreign currency translation (2) 0
Dispositions (Note 3) 0  
Net balances, end of year 18 (7)
Reinsurance contracts held | non-PAA | CSM | Corporate    
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items]    
Net balances, beginning of year 4 (13)
CSM recognized for services provided 2 3
Changes in estimates that adjust CSM (7) 14
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 0 0
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued 0 0
Foreign currency translation 0 0
Dispositions (Note 3) 1  
Net balances, end of year $ 0 $ 4