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Derivative and Hedging Instruments - Summary of Fair Value and Fair Value Hierarchy of Derivative Instruments (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | $ 13,703 | $ 15,569
Total derivative liabilities | 7,803 | 7,822
Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 13,703 | 15,569
Total derivative liabilities | 7,803 | 7,822
Interest rate swaps [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 12,155 | 14,199
Total derivative liabilities | 5,815 | 6,309
Foreign Exchange Contract [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 886 | 527
Total derivative liabilities | 1,814 | 1,490
Equity contracts [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 653 | 829
Total derivative liabilities | 174 | 23
Credit default swaps [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 9 | 14
Level 2 [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 13,043 | 14,490
Total derivative liabilities | 7,249 | 7,512
Level 2 [Member] | Interest rate swaps [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 11,537 | 13,181
Total derivative liabilities | 5,318 | 6,012
Level 2 [Member] | Foreign Exchange Contract [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 876 | 527
Total derivative liabilities | 1,813 | 1,490
Level 2 [Member] | Equity contracts [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 621 | 768
Total derivative liabilities | 118 | 10
Level 2 [Member] | Credit default swaps [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 9 | 14
Level 3 [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 660 | 1,079
Total derivative liabilities | 554 | 310
Level 3 [Member] | Interest rate swaps [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 618 | 1,018
Total derivative liabilities | 497 | 297
Level 3 [Member] | Foreign Exchange Contract [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 10 |
Total derivative liabilities | 1 |
Level 3 [Member] | Equity contracts [Member] | Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Total derivative assets | 32 | 61
Total derivative liabilities | $ 56 | $ 13

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