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Segmented Information - Summary of Results by Geographic Location (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Insurance service result    
Total insurance service result $ 3,977 $ 3,160
Net investment income (loss) 18,021 337
Insurance finance income (expense)    
Total insurance finance income (expenses) (13,894) (6,616)
Reinsurance finance income (expense)    
Total insurance finance income (expenses) (734) 309
Decrease (increase) in investment contract liabilities    
Decrease (increase) in investment contract liabilities (435) (399)
Net segregated fund investment result 0 0
Total investment result 2,958 (6,369)
Other revenue 6,746 6,186
Life, health and property and casualty insurance [Member]    
Insurance service result    
Total insurance service result 3,827 2,890
Insurance finance income (expense)    
Total insurance finance income (expenses) (12,350) (5,051)
Reinsurance finance income (expense)    
Total insurance finance income (expenses) (360) 666
Annuities and pensions [Member]    
Insurance service result    
Total insurance service result 150 270
Insurance finance income (expense)    
Total insurance finance income (expenses) (1,544) (1,565)
Reinsurance finance income (expense)    
Total insurance finance income (expenses) (374) (357)
Asia [Member]    
Insurance service result    
Total insurance service result 1,959 1,709
Net investment income (loss) 7,259 1,264
Insurance finance income (expense)    
Total insurance finance income (expenses) (6,437) (1,654)
Reinsurance finance income (expense)    
Total insurance finance income (expenses) (120) (77)
Decrease (increase) in investment contract liabilities    
Decrease (increase) in investment contract liabilities (220) (126)
Net segregated fund investment result 0 0
Total investment result 482 (593)
Other revenue 1,332 1,294
Asia [Member] | Life, health and property and casualty insurance [Member]    
Insurance service result    
Total insurance service result 2,087 1,873
Insurance finance income (expense)    
Total insurance finance income (expenses) (4,971) 607
Reinsurance finance income (expense)    
Total insurance finance income (expenses) (121) (74)
Asia [Member] | Annuities and pensions [Member]    
Insurance service result    
Total insurance service result (128) (164)
Insurance finance income (expense)    
Total insurance finance income (expenses) (1,466) (2,261)
Reinsurance finance income (expense)    
Total insurance finance income (expenses) 1 (3)
Canada [member]    
Insurance service result    
Total insurance service result 1,179 1,171
Net investment income (loss) 5,724 (1,061)
Insurance finance income (expense)    
Total insurance finance income (expenses) (2,633) (74)
Reinsurance finance income (expense)    
Total insurance finance income (expenses) (624) (256)
Decrease (increase) in investment contract liabilities    
Decrease (increase) in investment contract liabilities (130) (79)
Net segregated fund investment result 0 0
Total investment result 2,337 (1,470)
Other revenue 2,147 2,044
Canada [member] | Life, health and property and casualty insurance [Member]    
Insurance service result    
Total insurance service result 981 909
Insurance finance income (expense)    
Total insurance finance income (expenses) (2,606) (578)
Reinsurance finance income (expense)    
Total insurance finance income (expenses) (623) (254)
Canada [member] | Annuities and pensions [Member]    
Insurance service result    
Total insurance service result 198 262
Insurance finance income (expense)    
Total insurance finance income (expenses) (27) 504
Reinsurance finance income (expense)    
Total insurance finance income (expenses) (1) (2)
U.S. [member]    
Insurance service result    
Total insurance service result 591 380
Net investment income (loss) 4,975 (189)
Insurance finance income (expense)    
Total insurance finance income (expenses) (4,844) (4,896)
Reinsurance finance income (expense)    
Total insurance finance income (expenses) 10 642
Decrease (increase) in investment contract liabilities    
Decrease (increase) in investment contract liabilities (79) (194)
Net segregated fund investment result 0 0
Total investment result 62 (4,637)
Other revenue 3,239 2,907
U.S. [member] | Life, health and property and casualty insurance [Member]    
Insurance service result    
Total insurance service result 511 208
Insurance finance income (expense)    
Total insurance finance income (expenses) (4,793) (5,088)
Reinsurance finance income (expense)    
Total insurance finance income (expenses) 384 994
U.S. [member] | Annuities and pensions [Member]    
Insurance service result    
Total insurance service result 80 172
Insurance finance income (expense)    
Total insurance finance income (expenses) (51) 192
Reinsurance finance income (expense)    
Total insurance finance income (expenses) (374) (352)
Other [Member]    
Insurance service result    
Total insurance service result 248 (100)
Net investment income (loss) 63 323
Insurance finance income (expense)    
Total insurance finance income (expenses) 20 8
Reinsurance finance income (expense)    
Total insurance finance income (expenses) 0 0
Decrease (increase) in investment contract liabilities    
Decrease (increase) in investment contract liabilities (6) 0
Net segregated fund investment result 0 0
Total investment result 77 331
Other revenue 28 (59)
Other [Member] | Life, health and property and casualty insurance [Member]    
Insurance service result    
Total insurance service result 248 (100)
Insurance finance income (expense)    
Total insurance finance income (expenses) 20 8
Reinsurance finance income (expense)    
Total insurance finance income (expenses) 0 0
Other [Member] | Annuities and pensions [Member]    
Insurance service result    
Total insurance service result 0 0
Insurance finance income (expense)    
Total insurance finance income (expenses) 0 0
Reinsurance finance income (expense)    
Total insurance finance income (expenses) $ 0 $ 0