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Derivative and Hedging Instruments - Summary of Gross Notional Amount and Fair Value of Derivative Instruments (Detail) - CAD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | $ 414,734,000,000 | $ 336,773,000,000
Fair value, assets | 13,703,000,000 | 15,569,000,000
Fair value, liabilities | 7,803,000,000 | 7,822,000,000
Designated [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 4,489,000,000 | 2,679,000,000
Designated [Member] | Fair value hedges [Member] | Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 519,000,000 | 548,000,000
Designated [Member] | Fair value hedges [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 91,000,000 | 84,000,000
Designated [Member] | Cash flow hedges [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 1,834,000,000 | 1,757,000,000
Designated [Member] | Cash flow hedges [Member] | Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 80,000,000 | 165,000,000
Designated [Member] | Cash flow hedges [Member] | Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 101,000,000 | 125,000,000
Designated [Member] | Hedges of net investment in foreign operations [Member] | Foreign Currency Forwards [member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 1,864,000,000 |
Non designated [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 410,245,000,000 | 334,094,000,000
Non designated [Member] | Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 300,704,000,000 | 246,270,000,000
Non designated [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 23,156,000,000 | 16,321,000,000
Non designated [Member] | Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 29,248,000,000 | 20,341,000,000
Non designated [Member] | Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 15,492,000,000 | 13,597,000,000
Non designated [Member] | Interest rate futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 14,297,000,000 | 11,551,000,000
Non designated [Member] | Interest rate options [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 11,736,000,000 | 10,093,000,000
Non designated [Member] | Currency rate futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 4,052,000,000 | 3,157,000,000
Non designated [Member] | Credit default swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 652,000,000 | 606,000,000
Non designated [Member] | Equity futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 10,908,000,000 | 12,158,000,000
Fair value [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 13,703,000,000 | 15,569,000,000
Fair value, liabilities | 7,803,000,000 | 7,822,000,000
Fair value [Member] | Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 12,155,000,000 | 14,199,000,000
Fair value, liabilities | 5,815,000,000 | 6,309,000,000
Fair value [Member] | Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 653,000,000 | 829,000,000
Fair value, liabilities | 174,000,000 | 23,000,000
Fair value [Member] | Credit default swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 9,000,000 | 14,000,000
Fair value [Member] | Designated [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 106,000,000 | 37,000,000
Fair value, liabilities | 466,000,000 | 362,000,000
Fair value [Member] | Designated [Member] | Fair value hedges [Member] | Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, liabilities | 13,000,000 | 20,000,000
Fair value [Member] | Designated [Member] | Fair value hedges [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 5,000,000 | 1,000,000
Fair value, liabilities |  | 4,000,000
Fair value [Member] | Designated [Member] | Cash flow hedges [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 80,000,000 | 20,000,000
Fair value, liabilities | 367,000,000 | 333,000,000
Fair value [Member] | Designated [Member] | Cash flow hedges [Member] | Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, liabilities | 9,000,000 | 4,000,000
Fair value [Member] | Designated [Member] | Cash flow hedges [Member] | Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets |  | 16,000,000
Fair value, liabilities | 12,000,000 | 1,000,000
Fair value [Member] | Designated [Member] | Hedges of net investment in foreign operations [Member] | Foreign Currency Forwards [member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 21,000,000 |
Fair value, liabilities | 65,000,000 |
Fair value [Member] | Non designated [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 13,597,000,000 | 15,532,000,000
Fair value, liabilities | 7,337,000,000 | 7,460,000,000
Fair value [Member] | Non designated [Member] | Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 11,204,000,000 | 12,984,000,000
Fair value, liabilities | 5,675,000,000 | 6,251,000,000
Fair value [Member] | Non designated [Member] | Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 747,000,000 | 494,000,000
Fair value, liabilities | 1,341,000,000 | 1,122,000,000
Fair value [Member] | Non designated [Member] | Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 670,000,000 | 915,000,000
Fair value, liabilities | 158,000,000 | 65,000,000
Fair value [Member] | Non designated [Member] | Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 653,000,000 | 813,000,000
Fair value, liabilities | 163,000,000 | 22,000,000
Fair value [Member] | Non designated [Member] | Interest rate options [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | 314,000,000 | 312,000,000
Fair value [Member] | Non designated [Member] | Credit default swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Fair value, assets | $ 9,000,000 | $ 14,000,000

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