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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, 2022
Dec. 31, 2021
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period $ 917,643  
Asset at end of period 848,941 $ 917,643
Debt securities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 224,139  
Asset at end of period 203,904 224,139
Public equities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 28,067  
Asset at end of period 23,519 28,067
Level 3 [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 41,915 38,234
Net realized/unrealized gains (losses) included in net income (3,465) 2,901
Net realized/unrealized gains (losses) included in net AOCI 1 2
Purchases 5,479 5,399
Sales (2,100) (1,977)
Settlements (750) (1,702)
Transfer into Level 366 44
Transfer out of Level (398) (718)
Currency Movement 1,527 (268)
Asset at end of period 42,575 41,915
Change in unrealized gains (losses) on assets still held (1,846) 2,752
Level 3 [Member] | Derivatives [member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 2,101 3,443
Net realized/unrealized gains (losses) included in net income (5,413) (897)
Net realized/unrealized gains (losses) included in net AOCI (7)  
Purchases (109) 14
Settlements 775 (182)
Transfer out of Level (356) (309)
Currency Movement (163) 32
Asset at end of period (3,172) 2,101
Change in unrealized gains (losses) on assets still held (3,511) (547)
Level 3 [Member] | Segregated funds net assets [member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 4,281 4,202
Net realized/unrealized gains (losses) included in net income 475 350
Purchases 246 68
Sales (1,113) (303)
Settlements (46) (28)
Transfer out of Level (1)  
Currency Movement 143 (8)
Asset at end of period 3,985 4,281
Change in unrealized gains (losses) on assets still held 79 116
Level 3 [Member] | FVTPL [Member] | Public equities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Net realized/unrealized gains (losses) included in net income (6)  
Purchases 69 62
Sales (84) (62)
Transfer into Level 87  
Currency Movement 5  
Asset at end of period 71  
Change in unrealized gains (losses) on assets still held (15)  
Level 3 [Member] | FVTPL [Member] | Corporate [member] | Debt securities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 40 510
Net realized/unrealized gains (losses) included in net income (1) 11
Purchases 27 11
Sales   (93)
Settlements (1)  
Transfer into Level 6 11
Transfer out of Level (40) (409)
Currency Movement 1 (1)
Asset at end of period 32 40
Change in unrealized gains (losses) on assets still held (1) (8)
Level 3 [Member] | FVTPL [Member] | Other securitized assets [Member] | Debt securities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 28 45
Net realized/unrealized gains (losses) included in net income 2 3
Sales   (9)
Settlements (4) (39)
Transfer into Level   28
Asset at end of period 26 28
Change in unrealized gains (losses) on assets still held 2 (4)
Level 3 [Member] | AFS [Member] | Public equities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Net realized/unrealized gains (losses) included in net income (1)  
Net realized/unrealized gains (losses) included in net AOCI 1  
Level 3 [Member] | AFS [Member] | Other government and agency [Member] | Debt securities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Transfer into Level 10  
Currency Movement (1)  
Asset at end of period 9  
Level 3 [Member] | AFS [Member] | Corporate [member] | Debt securities [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 1 3
Net realized/unrealized gains (losses) included in net income   1
Sales   (3)
Transfer out of Level (1)  
Asset at end of period   1
Level 3 [Member] | Real estate [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 35,533 30,589
Net realized/unrealized gains (losses) included in net income 1,473 3,448
Net realized/unrealized gains (losses) included in net AOCI 8 2
Purchases 5,342 5,317
Sales (987) (1,674)
Settlements (1,479) (1,492)
Transfer into Level 366 44
Transfer out of Level (41) (409)
Currency Movement 1,547 (292)
Asset at end of period 41,762 35,533
Change in unrealized gains (losses) on assets still held 1,586 3,183
Level 3 [Member] | Real estate [Member] | Other invested assets [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 24,043 19,049
Net realized/unrealized gains (losses) included in net income 1,922 2,731
Net realized/unrealized gains (losses) included in net AOCI 7 2
Purchases 4,934 5,058
Sales (666) (1,131)
Settlements (1,474) (1,453)
Transfer into Level 248 5
Currency Movement 1,216 (218)
Asset at end of period 30,230 24,043
Change in unrealized gains (losses) on assets still held 2,046 2,569
Level 3 [Member] | Real estate [Member] | Investment property [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Asset Beginning of period 11,421 10,982
Net realized/unrealized gains (losses) included in net income (443) 702
Purchases 312 186
Sales (237) (376)
Transfer into Level 15  
Currency Movement 326 (73)
Asset at end of period 11,394 11,421
Change in unrealized gains (losses) on assets still held $ (446) $ 626