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Segregated Funds - Summary of Changes in Segregated Funds Net Assets (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Net policyholder cash flow    
Deposits from policyholders $ 42,427 $ 44,548
Net transfers to general fund (1,267) (732)
Payments to policyholders (46,333) (52,182)
Net policyholder cash flow (5,173) (8,366)
Investment related    
Interest and dividends 21,900 24,092
Net realized and unrealized investment gains (losses) (78,017) 21,549
Investment related (56,117) 45,641
Other    
Management and administration fees (3,886) (4,115)
Impact of changes in foreign exchange rates 13,913 (773)
Other 10,027 (4,888)
Net additions (51,263) 32,387
Segregated funds net assets, beginning of year 400,196 367,809
Segregated funds net assets, end of year $ 348,933 $ 400,196