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Derivative and Hedging Instruments - Additional Information (Detail) - CAD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | $ 418,978,000,000 | $ 402,477,000,000
Fair value of reinsurance ceded guaranteed minimum income benefits | 1,007,000,000 | 981,000,000
Fair value of reinsurance assumed guaranteed minimum income benefits | 112,000,000 | 109,000,000
Fair value of credit and interest rate embedded derivatives | (229,000,000) | (137,000,000)
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 | $ 11 |
Maximum time frame for which variable cash flows are hedged | 16 years |
Variable annuity guarantee dynamic hedging and macro equity risk hedging programs [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | $ 183,000,000,000 | $ 128,000,000,000

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