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Segregated Funds - Changes in Insurance Contracts and Investment Contracts for Account of Segregated Fund Holders (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Insurance Contracts And Investment Contracts For Account Of Segregated Fund Holders [Roll Forward]    
Balance as at January 1 $ 116,973  
Deductions from segregated funds:    
Net additions (deductions) 14,921 $ 11,432
Balance as at December 31 125,921 116,973
Investments and insurance contracts for account of segregated fund holders    
Insurance Contracts And Investment Contracts For Account Of Segregated Fund Holders [Roll Forward]    
Balance as at January 1 116,973 103,062
Additions to segregated funds:    
Deposits 12,880 11,958
Net transfer (to) from general funds (1,825) (437)
Net realized and unrealized gains (losses) 5,643 11,544
Other investment income 4,275 4,665
Total additions 20,973 27,730
Deductions from segregated funds:    
Payments to policyholders and their beneficiaries 10,618 12,024
Management fees 1,126 1,109
Taxes and other expenses 396 385
Adjustments For Increase (Decrease) In Insurance, Reinsurance And Investment Contract Liabilities, Deductions For Foreign Exchange Rate Movements (115) 301
Total deductions 12,025 13,819
Net additions (deductions) 8,948 13,911
Balance as at December 31 $ 125,921 $ 116,973