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Invested Assets and Investment Income - Summary of Invested Assets and Segregated Funds Net Assets Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period $ 833,689  
Asset at end of period 875,574 $ 833,689
Level 3 [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 83,721 83,606
Net realized/unrealized gains (losses) included in net income (964) (3,798)
Net realized/unrealized gains (losses) included in net AOCI 1,099 (6,146)
Purchases 9,626 10,821
Sales (3,472) (4,624)
Settlements (2,315) (1,779)
Transfer into Level 2,605 3,237
Transfer out of Level (2,939) (761)
Currency Movement (1,970) 3,165
Asset at end of period 85,391 83,721
Change in unrealized gains (losses) on assets still held (549) (1,976)
Level 3 [Member] | Derivatives [member]    
Disclosure of fair value measurement of assets [Line Items]    
Derivatives Beginning of period (3,188) 2,101
Net realized/unrealized gains (losses) included in net income (144) (5,429)
Net realized/unrealized gains (losses) included in net AOCI   (7)
Purchases   (109)
Sales   0
Settlements 960 775
Transfer out of Level 165 (356)
Currency Movement 41 (163)
Derivatives at end of period (2,166) (3,188)
Change in unrealized gains (losses) on assets still held 17 (3,527)
Level 3 [Member] | Other invested assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Transfer out of Level (68)  
Level 3 [Member] | Own use property [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 2,682  
Net realized/unrealized gains (losses) included in net income (234)  
Purchases 20  
Currency Movement (38)  
Asset at end of period 2,430 2,682
Change in unrealized gains (losses) on assets still held (234)  
Level 3 [Member] | Segregated funds net assets [member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 3,985 4,281
Net realized/unrealized gains (losses) included in net income (97) 475
Purchases 110 246
Sales (466) (1,113)
Settlements 24 (46)
Transfer out of Level (15) (1)
Currency Movement (49) 143
Asset at end of period 3,492 3,985
Change in unrealized gains (losses) on assets still held 32 79
Level 3 [Member] | FVOCI [Member] | Private placements [member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 7,828 5,136
Net realized/unrealized gains (losses) included in net income (4) (9)
Net realized/unrealized gains (losses) included in net AOCI 258 (1,453)
Purchases 1,942 1,697
Sales (497) (89)
Settlements (1,172) (188)
Transfer into Level 2,546 2,876
Transfer out of Level (2,907) (362)
Currency Movement (312) 220
Asset at end of period 7,682 7,828
Level 3 [Member] | FVOCI [Member] | Mortgages [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 28,621 31,798
Net realized/unrealized gains (losses) included in net income 65 (76)
Net realized/unrealized gains (losses) included in net AOCI 830 (4,692)
Purchases 1,984 3,511
Sales (1,626) (2,411)
Settlements (856) (757)
Currency Movement (545) 1,248
Asset at end of period 28,473 28,621
Level 3 [Member] | FVOCI [Member] | Other government and agency [Member] | Debt securities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 9  
Purchases 2  
Transfer into Level   9
Currency Movement (1)  
Asset at end of period 10 9
Level 3 [Member] | FVOCI [Member] | Corporate [member] | Debt securities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 32 41
Net realized/unrealized gains (losses) included in net AOCI 3 (1)
Purchases 178 27
Settlements (7) (1)
Transfer into Level 25 6
Transfer out of Level   (42)
Currency Movement   2
Asset at end of period 231 32
Level 3 [Member] | FVOCI [Member] | Other securitized assets [Member] | Debt securities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 26 28
Net realized/unrealized gains (losses) included in net AOCI 1 2
Settlements (5) (4)
Currency Movement (1)  
Asset at end of period 21 26
Level 3 [Member] | FVTPL [Member] | Public equities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 71  
Net realized/unrealized gains (losses) included in net income   (6)
Purchases 37 69
Sales   (84)
Transfer into Level   87
Transfer out of Level (67)  
Currency Movement   5
Asset at end of period 41 71
Change in unrealized gains (losses) on assets still held   (13)
Level 3 [Member] | FVTPL [Member] | Private placements [member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 31 30
Net realized/unrealized gains (losses) included in net income 44 (7)
Purchases 17  
Settlements (1) (1)
Transfer into Level 34 9
Transfer out of Level (47)  
Currency Movement 1  
Asset at end of period 79 31
Change in unrealized gains (losses) on assets still held 44 (7)
Level 3 [Member] | FVTPL [Member] | Mortgages [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 1,138 1,203
Net realized/unrealized gains (losses) included in net income 37 (117)
Purchases 160 110
Sales (239) (22)
Settlements (39) (38)
Currency Movement (2) 2
Asset at end of period 1,055 1,138
Level 3 [Member] | Real estate [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 82,924 77,224
Net realized/unrealized gains (losses) included in net income (723) 1,156
Net realized/unrealized gains (losses) included in net AOCI 1,099 (6,139)
Purchases 9,516 10,684
Sales (3,006) (3,511)
Settlements (3,299) (2,508)
Transfer into Level 2,605 3,237
Transfer out of Level (3,089) (404)
Currency Movement (1,962) 3,185
Asset at end of period 84,065 82,924
Change in unrealized gains (losses) on assets still held (598) 1,472
Level 3 [Member] | Real estate [Member] | Other invested assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 31,069 24,884
Net realized/unrealized gains (losses) included in net income 423 1,934
Net realized/unrealized gains (losses) included in net AOCI 7 5
Purchases 4,760 4,938
Sales (522) (668)
Settlements (1,219) (1,519)
Transfer into Level   248
Currency Movement (865) 1,247
Asset at end of period 33,585 31,069
Change in unrealized gains (losses) on assets still held 647 2,057
Level 3 [Member] | Real estate [Member] | Investment property [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 11,417 11,443
Net realized/unrealized gains (losses) included in net income (1,054) (443)
Purchases 416 312
Sales (122) (237)
Transfer into Level   17
Currency Movement (199) 325
Asset at end of period 10,458 11,417
Change in unrealized gains (losses) on assets still held (1,055) (445)
Level 3 [Member] | Real estate [Member] | Own use property [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period $ 2,682 2,661
Net realized/unrealized gains (losses) included in net income   (120)
Purchases   20
Transfer into Level   (15)
Currency Movement   136
Asset at end of period   2,682
Change in unrealized gains (losses) on assets still held   $ (120)