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Financial Instrument Risk Management - Debt Securities 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
Debt securities | Credit risk |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 74,443 | 72,619
Debt securities | Credit risk | AAA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 15,647 | 13,449
Debt securities | Credit risk | AA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 16,252 | 15,815
Debt securities | Credit risk | A |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 21,536 | 22,603
Debt securities | Credit risk | BBB |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 20,129 | 19,568
Debt securities | Credit risk | BB and lower |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 879 | 1,184
Fair value through profit or loss | Debt securities | Credit risk |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 61,402 | 59,967
Fair value through profit or loss | Debt securities | Credit risk | AAA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 9,728 | 8,579
Fair value through profit or loss | Debt securities | Credit risk | AA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 14,208 | 14,006
Fair value through profit or loss | Debt securities | Credit risk | A |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 19,089 | 19,603
Fair value through profit or loss | Debt securities | Credit risk | BBB |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 17,646 | 16,894
Fair value through profit or loss | Debt securities | Credit risk | BB and lower |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 731 | 885
Available-for-sale | Debt securities | Credit risk |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 13,041 | 12,652
Available-for-sale | Debt securities | Credit risk | AAA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 5,919 | 4,870
Available-for-sale | Debt securities | Credit risk | AA |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 2,044 | 1,809
Available-for-sale | Debt securities | Credit risk | A |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 2,447 | 3,000
Available-for-sale | Debt securities | Credit risk | BBB |  |
Disclosure of external credit grades [line items] |  |
Financial assets | 2,483 | 2,674
Available-for-sale | Debt securities | Credit risk | BB and lower |  |
Disclosure of external credit grades [line items] |  |
Financial assets | $ 148 | $ 299

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