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Segregated Funds - Summary of Changes in Segregated Funds Net Assets (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Net policyholder cash flow    
Deposits from policyholders CAD 34,776 CAD 33,130
Net transfers to general fund (1,734) (878)
Payments to policyholders (45,970) (39,731)
Net policyholder cash flow (12,928) (7,479)
Investment related    
Interest and dividends 16,930 15,736
Net realized and unrealized investment gains 24,384 4,097
Investment related 41,314 19,833
Other    
Management and administration fees (4,496) (4,386)
Impact of changes in foreign exchange rates (14,790) (6,007)
Other (19,286) (10,393)
Net additions 9,100 1,961
Segregated funds net assets, beginning of year 315,708 313,747
Segregated funds net assets, end of year CAD 324,808 CAD 315,708