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Segregated Funds - Summary of Changes in Segregated Funds Net Assets (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Net policyholder cash flow    
Deposits from policyholders $ 38,236 $ 34,776
Net transfers to general fund (1,089) (1,734)
Payments to policyholders (47,475) (46,305)
Net policyholder cash flow (10,328) (13,263)
Investment related    
Interest and dividends 19,535 16,930
Net realized and unrealized investment gains (losses) (34,683) 24,384
Investment related (15,148) 41,314
Other    
Management and administration fees (3,985) (4,161)
Impact of changes in foreign exchange rates 18,249 (14,790)
Other 14,264 (18,951)
Net additions (deductions) (11,212) 9,100
Segregated funds net assets, beginning of year 324,808 315,708
Segregated funds net assets, end of year $ 313,596 $ 324,808