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Financial Instrument Risk Management - Notional Amount of Derivative Financial Instruments (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | $ 168,785 | $ 152,785
Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 62,792 | 62,131
Swap contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 912 | 1,227
Over-the-counter interest rate contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 6 | 50
Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 17,675 | 19,607
Over-the-counter interest rate contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 6,288 | 6,746
Over-the-counter interest rate contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 465 | 831
Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 12,236 | 9,426
Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 18,524 | 16,956
Over-the-counter other contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 307 | 304
Over-the-counter other contracts | Swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 171 | 179
Over-the-counter other contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 127 | 1,164
Over-the-counter other contracts | Credit derivatives | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 912 | 1,227
Exchange-traded interest rate contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3,389 | 2,917
Exchange-traded equity contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 127 | 200
Exchange-traded equity contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 12 | 17
Exchange-traded equity contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,553 | 2,507
Under 1 Year | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 21,909 | 16,540
Under 1 Year | Over-the-counter interest rate contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 50
Under 1 Year | Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1,010 | 1,906
Under 1 Year | Over-the-counter interest rate contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 757 | 617
Under 1 Year | Over-the-counter interest rate contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 357
Under 1 Year | Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 12,205 | 5,289
Under 1 Year | Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1,260 | 867
Under 1 Year | Over-the-counter other contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 132 | 128
Under 1 Year | Over-the-counter other contracts | Swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 170 | 178
Under 1 Year | Over-the-counter other contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 119 | 1,164
Under 1 Year | Over-the-counter other contracts | Credit derivatives | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 175 | 343
Under 1 Year | Exchange-traded interest rate contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3,389 | 2,917
Under 1 Year | Exchange-traded equity contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 127 | 200
Under 1 Year | Exchange-traded equity contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 12 | 17
Under 1 Year | Exchange-traded equity contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,553 | 2,507
1 to 5 Years | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 10,829 | 15,720
1 to 5 Years | Over-the-counter interest rate contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 6 | 0
1 to 5 Years | Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3,363 | 3,052
1 to 5 Years | Over-the-counter interest rate contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3,246 | 3,279
1 to 5 Years | Over-the-counter interest rate contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 465 | 474
1 to 5 Years | Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 31 | 4,137
1 to 5 Years | Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,797 | 3,723
1 to 5 Years | Over-the-counter other contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 175 | 176
1 to 5 Years | Over-the-counter other contracts | Swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1 | 1
1 to 5 Years | Over-the-counter other contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 8 | 0
1 to 5 Years | Over-the-counter other contracts | Credit derivatives | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 737 | 878
1 to 5 Years | Exchange-traded interest rate contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
1 to 5 Years | Exchange-traded equity contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
1 to 5 Years | Exchange-traded equity contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
1 to 5 Years | Exchange-traded equity contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
Over 5 Years | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 30,054 | 29,871
Over 5 Years | Over-the-counter interest rate contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
Over 5 Years | Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 13,302 | 14,649
Over 5 Years | Over-the-counter interest rate contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,285 | 2,850
Over 5 Years | Over-the-counter interest rate contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
Over 5 Years | Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
Over 5 Years | Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 14,467 | 12,366
Over 5 Years | Over-the-counter other contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
Over 5 Years | Over-the-counter other contracts | Swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
Over 5 Years | Over-the-counter other contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
Over 5 Years | Over-the-counter other contracts | Credit derivatives | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 6
Over 5 Years | Exchange-traded interest rate contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
Over 5 Years | Exchange-traded equity contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
Over 5 Years | Exchange-traded equity contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 0
Over 5 Years | Exchange-traded equity contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | $ 0 | $ 0

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