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Financial Instrument Risk Management - Reinsurance Counterparties Exposure by Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of external credit grades [line items]    
Financial assets $ 168,785 $ 152,785
Total Reinsurance assets 3,843 4,024
Credit risk | Gross exposure    
Disclosure of external credit grades [line items]    
Less: Negative reinsurance assets 1,785 1,443
Total Reinsurance assets 3,843 4,024
Credit risk | Gross exposure | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 5,628 5,467
Credit risk | Gross exposure | AA | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 2,222 2,131
Credit risk | Gross exposure | A | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,156 1,170
Credit risk | Gross exposure | BBB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 213 200
Credit risk | Gross exposure | BB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,779 1,707
Credit risk | Gross exposure | CCC | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 168 181
Credit risk | Gross exposure | Not rated | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 90 78
Credit risk | Collateral | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 2,187 2,099
Credit risk | Collateral | AA | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 8 5
Credit risk | Collateral | A | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 73 68
Credit risk | Collateral | BBB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 127 128
Credit risk | Collateral | BB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,740 1,663
Credit risk | Collateral | CCC | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 164 168
Credit risk | Collateral | Not rated | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 75 67
Credit risk | Net exposure | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 3,441 3,368
Credit risk | Net exposure | AA | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 2,214 2,126
Credit risk | Net exposure | A | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 1,083 1,102
Credit risk | Net exposure | BBB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 86 72
Credit risk | Net exposure | BB | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 39 44
Credit risk | Net exposure | CCC | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets 4 13
Credit risk | Net exposure | Not rated | Reinsurance Assets    
Disclosure of external credit grades [line items]    
Financial assets $ 15 $ 11