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Financial Instrument Risk Management - Debt Securities by 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
Debt securities | Credit risk |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 81,606 | 74,443
Debt securities | Credit risk | AAA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 17,727 | 15,647
Debt securities | Credit risk | AA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 12,173 | 16,252
Debt securities | Credit risk | A |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 30,378 | 21,536
Debt securities | Credit risk | BBB |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 20,587 | 20,129
Debt securities | Credit risk | BB and lower |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 741 | 879
Fair value through profit or loss | Debt securities | Credit risk |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 67,894 | 61,402
Fair value through profit or loss | Debt securities | Credit risk | AAA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 11,097 | 9,728
Fair value through profit or loss | Debt securities | Credit risk | AA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 10,503 | 14,208
Fair value through profit or loss | Debt securities | Credit risk | A |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 27,341 | 19,089
Fair value through profit or loss | Debt securities | Credit risk | BBB |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 18,339 | 17,646
Fair value through profit or loss | Debt securities | Credit risk | BB and lower |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 614 | 731
Available-for-sale | Debt securities | Credit risk |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 13,712 | 13,041
Available-for-sale | Debt securities | Credit risk | AAA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 6,630 | 5,919
Available-for-sale | Debt securities | Credit risk | AA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 1,670 | 2,044
Available-for-sale | Debt securities | Credit risk | A |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 3,037 | 2,447
Available-for-sale | Debt securities | Credit risk | BBB |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 2,248 | 2,483
Available-for-sale | Debt securities | Credit risk | BB and lower |  |
Disclosure of external credit grades [line items] |  |
Financial assets | $ 127 | $ 148

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