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Financial Instrument Risk Management - Reinsurance Counterparties Exposure by Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of external credit grades [line items]    
Financial assets $ 143,061 $ 137,691
Total Reinsurance assets 4,141 4,028
Credit risk | Gross exposure    
Disclosure of external credit grades [line items]    
Less: negative reinsurance assets 1,272 874
Total Reinsurance assets 4,141 4,028
Credit risk | Gross exposure | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 5,413 4,902
Credit risk | Gross exposure | AA | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,442 1,241
Credit risk | Gross exposure | A | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,760 1,632
Credit risk | Gross exposure | BBB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 203 157
Credit risk | Gross exposure | BB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,677 1,539
Credit risk | Gross exposure | B | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 0 257
Credit risk | Gross exposure | CCC | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 252 0
Credit risk | Gross exposure | Not rated | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 79 76
Credit risk | Collateral | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,985 1,820
Credit risk | Collateral | AA | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 6 4
Credit risk | Collateral | A | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 83 99
Credit risk | Collateral | BBB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 132 116
Credit risk | Collateral | BB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,617 1,455
Credit risk | Collateral | B | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 0 74
Credit risk | Collateral | CCC | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 72 0
Credit risk | Collateral | Not rated | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 75 72
Credit risk | Net exposure | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 3,428 3,082
Credit risk | Net exposure | AA | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,436 1,237
Credit risk | Net exposure | A | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,677 1,533
Credit risk | Net exposure | BBB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 71 41
Credit risk | Net exposure | BB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 60 84
Credit risk | Net exposure | B | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 0 183
Credit risk | Net exposure | CCC | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 180 0
Credit risk | Net exposure | Not rated | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets $ 4 $ 4