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Financial Instrument Risk Management - Notional Amount of Derivative Financial Instruments (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | $ 143,061 | $ 137,691
Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 59,198 | 54,121
Swap contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1,356 | 1,121
Over-the-counter interest rate contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 469
Over-the-counter interest rate contracts | Interest rate swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 21,292 | 20,887
Over-the-counter interest rate contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 7,833 | 5,779
Over-the-counter interest rate contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1,350 | 1,245
Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 6,544 | 6,347
Over-the-counter foreign exchange contracts | Foreign currency swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 14,193 | 11,744
Over-the-counter other contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 285 | 259
Over-the-counter other contracts | Swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 113 | 127
Over-the-counter other contracts | Credit derivatives | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1,356 | 1,121
Exchange-traded interest rate contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3,669 | 3,415
Exchange-traded equity contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 186 | 512
Exchange-traded equity contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,377 | 2,216
Under 1 Year | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 16,308 | 15,895
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 | 469
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 | 1,101 | 1,348
Under 1 Year | Over-the-counter interest rate contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1,198 | 1,062
Under 1 Year | Over-the-counter interest rate contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 477 | 0
Under 1 Year | Over-the-counter foreign exchange contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 6,529 | 6,305
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 | 532 | 332
Under 1 Year | Over-the-counter other contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 127 | 109
Under 1 Year | Over-the-counter other contracts | Swap contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 112 | 126
Under 1 Year | Over-the-counter other contracts | Credit derivatives | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 0 | 48
Under 1 Year | Exchange-traded interest rate contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3,669 | 3,415
Under 1 Year | Exchange-traded equity contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 186 | 465
Under 1 Year | Exchange-traded equity contracts | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 2,377 | 2,216
1 to 5 Years | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 13,006 | 11,879
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 | 0 | 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 | 3,506 | 3,486
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 | 2,898 | 2,266
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 | 648 | 786
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 | 15 | 42
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 | 4,451 | 4,198
1 to 5 Years | Over-the-counter other contracts | Forward contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 158 | 150
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 | Credit derivatives | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 1,329 | 903
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 | 47
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 | 29,884 | 26,347
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 | 16,685 | 16,053
Over 5 Years | Over-the-counter interest rate contracts | Options purchased | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 3,737 | 2,451
Over 5 Years | Over-the-counter interest rate contracts | Options written | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 225 | 459
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 | 9,210 | 7,214
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 | Credit derivatives | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 27 | 170
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 | Futures contracts | Derivative assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | $ 0 | $ 0

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