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Interests in Other Entities - Interest in Unconsolidated Structured Entities (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Joint ventures | Investment funds    
Disclosure of unconsolidated structured entities [line items]    
Carrying amount $ 213 $ 245
Debt securities | Securitization entities – third-party managed    
Disclosure of unconsolidated structured entities [line items]    
Carrying amount   5,899
Maximum exposure to loss 7,366 5,899
Cash, cash equivalents and short-term securities | Securitization entities – third-party managed    
Disclosure of unconsolidated structured entities [line items]    
Carrying amount 430 725
Maximum exposure to loss 430 725
Equity securities | Investment funds – third-party managed    
Disclosure of unconsolidated structured entities [line items]    
Carrying amount 3,439 4,877
Maximum exposure to loss 3,439 4,877
Equity securities and Other invested assets | Investment funds – company managed    
Disclosure of unconsolidated structured entities [line items]    
Carrying amount 1,705 1,455
Maximum exposure to loss 1,705 1,455
Other invested assets | Limited partnerships – third-party managed    
Disclosure of unconsolidated structured entities [line items]    
Carrying amount   1,258
Maximum exposure to loss $ 1,557 $ 1,258