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Segregated Funds - Summary of Composition of Segregated Funds Net Assets (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | $ 313,596 | $ 324,808 | $ 315,708
Composition of segregated funds net assets |  |  |
Held by policyholders | 313,209 | 324,307 |
Held by the Company | 387 | 501 |
Cash and short-term securities [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 3,700 | 4,756 |
Debt securities [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 15,313 | 15,472 |
Equity [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 11,661 | 12,624 |
Mutual funds [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 277,133 | 288,007 |
Other investments [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 4,678 | 4,514 |
Accrued investment income [member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | 1,811 | 201 |
Other assets and liabilities, net [Member] |  |  |
Disclosure of Composition Of Segregated Fund [line items] |  |  |
Total segregated funds net assets | $ (700) | $ (766) |

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