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Invested Assets and Investment Income - Additional Information (Detail) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of fair value measurement of assets [Line Items] |  |
Fair value of securitized assets | $ 750,271,000,000 | $ 729,533,000,000
Fair value of securitized liabilities | 703,120,000,000 | 687,370,000,000
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period | 0 |
Segregated funds [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period | 0 | 0
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period | 2,000,000 | 5,000,000
Other invested assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Profit (loss) from associates and joint ventures | 369,000,000 | 291,000,000
Dividends received from associates and joint ventures | 13,000,000 | 14,000,000
Securitized assets [Member] | Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Fair value of securitized assets | 3,843,000,000 | 3,533,000,000
Fair value of securitized liabilities | $ 3,756,000,000 | $ 3,503,000,000

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