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Financial Instrument Risk Management - Credit Default Swaps by Underlying Financial Instrument Credit Rating (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of external credit grades [line items] |  |
Financial assets | $ 152,785 | $ 143,061
Financial assets, at fair value | 156,591 | 144,673
Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 1,227 | 1,356
Financial assets, at fair value | 29 | 23
Single name credit default swap contracts: | Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 1,227 | 1,333
Financial assets, at fair value | 29 | 23
Single name credit default swap contracts: | AA | Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 45 | 48
Financial assets, at fair value | 1 | 1
Single name credit default swap contracts: | A | Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 574 | 611
Financial assets, at fair value | 9 | 9
Single name credit default swap contracts: | BBB | Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 608 | 674
Financial assets, at fair value | 19 | 13
Credit default swap index contracts | Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 0 | 23
Financial assets, at fair value | $ 0 | $ 0

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