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Derivative and Hedging Instruments - Summary of Effects of Derivatives Not Designated in Qualifying Hedge Accounting Relationships (Detail) - Non designated [Member] - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | $ (2,258) | $ (1,024)
Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (1,894) | (927)
Interest rate futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (298) | 372
Interest rate options [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (52) | (96)
Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (122) | 529
Currency rate futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | 3 | (92)
Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (355) | 1,231
Equity futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | 742 | (2,190)
Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (276) | 153
Credit default swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | $ (6) | $ (4)

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