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Derivative and Hedging Instruments - Additional Information (Detail) - CAD ($) | 12 Months Ended
--- | ---
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 of reinsurance ceded guaranteed minimum income benefits | 1,148,000,000 | 1,079,000,000
Fair value of reinsurance assumed guaranteed minimum income benefits | 114,000,000 | 100,000,000
Fair value of credit and interest rate embedded derivatives | 53,000,000 | 123,000,000
Shareholders' accumulated other comprehensive income (loss) ("AOCI") [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Net loss that will be reclassified from AOCI to net income within next 12 months | $ 31,000,000 |
Maximum time frame for which variable cash flows are hedged | 18 years |
Variable annuity guarantee dynamic hedging and macro equity risk hedging programs [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | $ 136,000,000,000 | $ 114,000,000,000

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