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Segregated Funds - Summary of Changes in Segregated Funds Net Assets (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Net policyholder cash flow    
Deposits from policyholders $ 44,548 $ 38,898
Net transfers to general fund (732) (1,515)
Payments to policyholders (52,182) (44,818)
Net policyholder cash flow (8,366) (7,435)
Investment related    
Interest and dividends 24,092 16,775
Net realized and unrealized investment gains (losses) 21,549 24,514
Investment related 45,641 41,289
Other    
Management and administration fees (4,115) (3,942)
Impact of changes in foreign exchange rates (773) (5,580)
Other (4,888) (9,522)
Net additions 32,387 24,332
Segregated funds net assets, beginning of year 367,809 343,477
Segregated funds net assets, end of year $ 400,196 $ 367,809