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Financial Instrument Risk Management - Credit Default Swaps by Underlying Financial Instrument Credit Rating (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of external credit grades [line items] |  |
Financial assets | $ 173,735 | $ 168,785
Financial assets, at fair value | 177,789 | 175,070
Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 835 | 912
Financial assets, at fair value | 14 | 17
Single Name Credit Default Swap Contract | Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 835 | 912
Financial assets, at fair value | 14 | 17
Single Name Credit Default Swap Contract | AA | Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 38 | 38
Financial assets, at fair value | 1 | 1
Single Name Credit Default Swap Contract | A | Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 347 | 325
Financial assets, at fair value | 4 | 4
Single Name Credit Default Swap Contract | BBB | Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 431 | 530
Financial assets, at fair value | 9 | 12
Single Name Credit Default Swap Contract | BB | Credit default swap contract |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 19 | 19
Financial assets, at fair value | $ 0 | $ 0

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