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Insurance Contracts - Insurance Contracts Issued and Reinsurance Contracts Held By Measurement Components (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance $ 75 $ 162
Insurance contract liabilities, beginning balance 154,433 175,491
Changes related to future service:    
Total changes related to future service (126) (153)
Changes related to past service — Adjustments to FCF for incurred claims (95) (17)
Total changes recognized in income and OCI 1,592 (2,516)
Cash flows:    
Insurance acquisition cash flows (2,034) (1,497)
Insurance contract assets, ending balance 184 75
Insurance contract liabilities, ending balance 154,710 154,433
Insurance    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance 75 162
Insurance contract liabilities, beginning balance 131,294 149,412
Net balances, beginning of year 131,219 149,250
Changes related to future service:    
Contracts initially recognized in the year 70 91
Changes related to past service — Adjustments to FCF for incurred claims 95 17
Insurance service result (4,080) (3,553)
Insurance finance (income) expenses from insurance contracts issued 9,675 (22,595)
Total changes recognized in income 5,595 (26,148)
Foreign currency translation (1,194) 3,330
Total changes recognized in income and OCI 4,401 (22,818)
Cash flows:    
Premiums received 31,876 27,655
Amounts paid to policyholders and other insurance service expenses paid (25,956) (21,555)
Insurance acquisition cash flows (2,061) (1,552)
Fees received from segregated funds 422 451
Other 393 (557)
Total cash flows 4,674 4,442
Dispositions (Note 3) (4,809)  
Insurance contract assets, ending balance 184 75
Insurance contract liabilities, ending balance 135,669 131,294
Net balances, end of year 135,485 131,219
Reinsurance contracts held    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance 6,115 6,612
Insurance contract liabilities, beginning balance 1,603 1,994
Net balances, beginning of year 4,512 4,618
Changes related to future service:    
Contracts initially recognized in the year 0 0
Insurance finance (income) expenses from insurance contracts issued 59 (440)
Total changes recognized in income (10) (593)
Foreign currency translation (171) 375
Total changes recognized in income and OCI (181) (218)
Cash flows:    
Premiums paid 2,268 2,489
Amounts recovered from reinsurers (2,111) (2,455)
Other (197) 78
Total cash flows (40) 112
Dispositions (Note 3) (120)  
Insurance contract assets, ending balance 5,794 6,115
Insurance contract liabilities, ending balance 1,623 1,603
Net balances, end of year 4,171 4,512
non-PAA | Insurance    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance 75 162
Insurance contract liabilities, beginning balance 114,371 132,017
Net balances, beginning of year 114,296 131,855
Changes related to current service:    
CSM recognized for services provided (923) (871)
Risk adjustment recognized for non-financial risk expired (545) (493)
Income taxes specifically chargeable to the policyholder (5) 71
Experience adjustments 169 229
Total changes related to current service (1,304) (1,064)
Changes related to future service:    
Changes in estimates that adjust CSM 0 0
Changes in estimates that do not adjust CSM (losses on onerous groups and reversals of such losses) 42 57
Contracts initially recognized in the year 70 91
Total changes related to future service 112 148
Changes related to past service — Adjustments to FCF for incurred claims (51) (27)
Insurance service result (1,243) (943)
Insurance finance (income) expenses from insurance contracts issued 8,648 (21,181)
Total changes recognized in income 7,405 (22,124)
Foreign currency translation (1,058) 3,093
Total changes recognized in income and OCI 6,347 (19,031)
Cash flows:    
Premiums received 14,798 12,610
Amounts paid to policyholders and other insurance service expenses paid (11,809) (9,499)
Insurance acquisition cash flows (2,034) (1,572)
Fees received from segregated funds 422 451
Other 393 (518)
Total cash flows 1,770 1,472
Dispositions (Note 3) (4,238) 0
Contracts modified 46 0
Insurance contract assets, ending balance 184 75
Insurance contract liabilities, ending balance 118,405 114,371
Net balances, end of year 118,221 114,296
non-PAA | Reinsurance contracts held    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance 5,674 6,175
Insurance contract liabilities, beginning balance 1,562 1,994
Net balances, beginning of year (4,112) (4,181)
Changes related to current service:    
CSM recognized for services provided (4) (10)
Risk adjustment recognized for non-financial risk expired (148) (131)
Experience adjustments 137 (105)
Total changes related to current service (15) (246)
Changes related to future service:    
Changes in estimates that adjust CSM 0 0
Changes in estimates that do not adjust CSM (losses on onerous groups and reversals of such losses) 35 23
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
Total changes related to future service 48 21
Changes related to past service — Adjustments to FCF for incurred claims (47) 245
Insurance service result (14) 20
Insurance finance (income) expenses from insurance contracts issued 45 (418)
Total changes recognized in income 31 (398)
Foreign currency translation (97) 406
Total changes recognized in income and OCI (66) 8
Cash flows:    
Premiums paid 1,525 1,562
Amounts recovered from reinsurers (1,434) (1,711)
Other (279) 72
Total cash flows (188) (77)
Dispositions (Note 3) (33) 0
Contracts modified 5 0
Insurance contract assets, ending balance 5,453 5,674
Insurance contract liabilities, ending balance 1,623 1,562
Net balances, end of year (3,830) (4,112)
Estimates of PV of future cash flows    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance 5,193  
Insurance contract liabilities, beginning balance 498,264  
Cash flows:    
Insurance contract assets, ending balance 4,840 5,193
Insurance contract liabilities, ending balance 583,616 498,264
Estimates of PV of future cash flows | non-PAA | Insurance    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance 195 426
Insurance contract liabilities, beginning balance 96,623 113,634
Net balances, beginning of year 96,428 113,208
Changes related to current service:    
Income taxes specifically chargeable to the policyholder (5) 71
Experience adjustments 169 229
Total changes related to current service 164 300
Changes related to future service:    
Changes in estimates that adjust CSM (1,206) (920)
Changes in estimates that do not adjust CSM (losses on onerous groups and reversals of such losses) 33 55
Contracts initially recognized in the year (1,702) (1,259)
Total changes related to future service (2,875) (2,124)
Changes related to past service — Adjustments to FCF for incurred claims (39) (25)
Insurance service result (2,750) (1,849)
Insurance finance (income) expenses from insurance contracts issued 8,131 (19,140)
Total changes recognized in income 5,381 (20,989)
Foreign currency translation (898) 2,737
Total changes recognized in income and OCI 4,483 (18,252)
Cash flows:    
Premiums received 14,798 12,610
Amounts paid to policyholders and other insurance service expenses paid (11,809) (9,499)
Insurance acquisition cash flows (2,034) (1,572)
Fees received from segregated funds 422 451
Other 393 (518)
Total cash flows 1,770 1,472
Dispositions (Note 3) (3,885) 0
Contracts modified 46 0
Insurance contract assets, ending balance 578 195
Insurance contract liabilities, ending balance 99,420 96,623
Net balances, end of year 98,842 96,428
Estimates of PV of future cash flows | non-PAA | Reinsurance contracts held    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance 4,061 4,412
Insurance contract liabilities, beginning balance 2,275 3,037
Net balances, beginning of year (1,786) (1,375)
Changes related to current service:    
Experience adjustments 137 (105)
Total changes related to current service 137 (105)
Changes related to future service:    
Changes in estimates that adjust CSM 68 (203)
Changes in estimates that relate to losses and reversals of losses on groups of underlying contracts (6) (4)
Contracts initially recognized in the year (45) (37)
Total changes related to future service 17 (244)
Changes related to past service — Adjustments to FCF for incurred claims (38) 249
Insurance service result 116 (100)
Insurance finance (income) expenses from insurance contracts issued (120) 229
Total changes recognized in income (4) 129
Foreign currency translation (81) 359
Total changes recognized in income and OCI (85) 488
Cash flows:    
Premiums paid 1,525 1,562
Amounts recovered from reinsurers (1,434) (1,711)
Other (279) 72
Total cash flows (188) (77)
Dispositions (Note 3) (25) 0
Contracts modified 5 0
Insurance contract assets, ending balance 3,848 4,061
Insurance contract liabilities, ending balance 2,355 2,275
Net balances, end of year (1,493) (1,786)
Risk adjustment | Insurance    
Changes related to future service:    
Contracts initially recognized in the year 513 456
Risk adjustment | Reinsurance contracts held    
Changes related to future service:    
Contracts initially recognized in the year 102 95
Risk adjustment | non-PAA | Insurance    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance (51) (163)
Insurance contract liabilities, beginning balance 6,847 8,580
Net balances, beginning of year 6,898 8,743
Changes related to current service:    
Risk adjustment recognized for non-financial risk expired (545) (493)
Income taxes specifically chargeable to the policyholder 0 0
Total changes related to current service (545) (493)
Changes related to future service:    
Changes in estimates that adjust CSM 292 (213)
Changes in estimates that do not adjust CSM (losses on onerous groups and reversals of such losses) 9 2
Contracts initially recognized in the year 513 456
Total changes related to future service 814 245
Changes related to past service — Adjustments to FCF for incurred claims (12) (2)
Insurance service result 257 (250)
Insurance finance (income) expenses from insurance contracts issued 525 (1,694)
Total changes recognized in income 782 (1,944)
Foreign currency translation (54) 99
Total changes recognized in income and OCI 728 (1,845)
Cash flows:    
Dispositions (Note 3) (92) 0
Contracts modified 0 0
Insurance contract assets, ending balance (146) (51)
Insurance contract liabilities, ending balance 7,388 6,847
Net balances, end of year 7,534 6,898
Risk adjustment | non-PAA | Reinsurance contracts held    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance 1,450 1,606
Insurance contract liabilities, beginning balance (771) (1,093)
Net balances, beginning of year (2,221) (2,699)
Changes related to current service:    
Risk adjustment recognized for non-financial risk expired (148) (131)
Total changes related to current service (148) (131)
Changes related to future service:    
Changes in estimates that adjust CSM (52) 147
Changes in estimates that relate to losses and reversals of losses on groups of underlying contracts 23 25
Contracts initially recognized in the year 102 95
Total changes related to future service 73 267
Changes related to past service — Adjustments to FCF for incurred claims (9) (4)
Insurance service result (84) 132
Insurance finance (income) expenses from insurance contracts issued 164 (648)
Total changes recognized in income 80 (516)
Foreign currency translation (14) 38
Total changes recognized in income and OCI 66 (478)
Cash flows:    
Dispositions (Note 3) (9) 0
Contracts modified 0 0
Insurance contract assets, ending balance 1,431 1,450
Insurance contract liabilities, ending balance (847) (771)
Net balances, end of year (2,278) (2,221)
CSM | Insurance    
Changes related to future service:    
Contracts initially recognized in the year 1,259 894
CSM | Reinsurance contracts held    
Changes related to future service:    
Contracts initially recognized in the year (57) (58)
CSM | non-PAA | Insurance    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance (69) (101)
Insurance contract liabilities, beginning balance 10,901 9,803
Net balances, beginning of year 10,970 9,904
Changes related to current service:    
CSM recognized for services provided (923) (871)
Total changes related to current service (923) (871)
Changes related to future service:    
Changes in estimates that adjust CSM 914 1,133
Contracts initially recognized in the year 1,259 894
Total changes related to future service 2,173 2,027
Insurance service result 1,250 1,156
Insurance finance (income) expenses from insurance contracts issued (8) (347)
Total changes recognized in income 1,242 809
Foreign currency translation (106) 257
Total changes recognized in income and OCI 1,136 1,066
Cash flows:    
Dispositions (Note 3) (261) 0
Contracts modified 0 0
Insurance contract assets, ending balance (248) (69)
Insurance contract liabilities, ending balance 11,597 10,901
Net balances, end of year 11,845 10,970
CSM | non-PAA | Reinsurance contracts held    
Disclosure of reconciliation of changes in insurance contracts by components [line items]    
Insurance contract assets, beginning balance 163 157
Insurance contract liabilities, beginning balance 58 50
Net balances, beginning of year (105) (107)
Changes related to current service:    
CSM recognized for services provided (4) (10)
Total changes related to current service (4) (10)
Changes related to future service:    
Changes in estimates that adjust CSM (16) 56
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)
Total changes related to future service (42) (2)
Insurance service result (46) (12)
Insurance finance (income) expenses from insurance contracts issued 1 1
Total changes recognized in income (45) (11)
Foreign currency translation (2) 9
Total changes recognized in income and OCI (47) (2)
Cash flows:    
Dispositions (Note 3) 1 0
Contracts modified 0 0
Insurance contract assets, ending balance 174 163
Insurance contract liabilities, ending balance 115 58
Net balances, end of year $ (59) $ (105)