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Risk Management - Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders Arising from Changes to Public Equity Returns (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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-30% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | $ (2,370) | $ (2,110)
General fund equity investments | (1,170) | (1,450)
Total underlying sensitivity before hedging | (3,540) | (3,560)
Impact of macro and dynamic hedge assets | 880 | 930
Net potential impact on net income attributed to shareholders after impact of hedging and before impact of reinsurance | (2,660) | (2,630)
Impact of reinsurance | 1,470 | 1,170
Net potential impact on net income attributed to shareholders after impact of hedging and reinsurance | (1,190) | (1,460)
-20% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | (1,460) | (1,310)
General fund equity investments | (770) | (920)
Total underlying sensitivity before hedging | (2,230) | (2,230)
Impact of macro and dynamic hedge assets | 530 | 570
Net potential impact on net income attributed to shareholders after impact of hedging and before impact of reinsurance | (1,700) | (1,660)
Impact of reinsurance | 900 | 740
Net potential impact on net income attributed to shareholders after impact of hedging and reinsurance | (800) | (920)
-10% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | (670) | (610)
General fund equity investments | (390) | (420)
Total underlying sensitivity before hedging | (1,060) | (1,030)
Impact of macro and dynamic hedge assets | 240 | 260
Net potential impact on net income attributed to shareholders after impact of hedging and before impact of reinsurance | (820) | (770)
Impact of reinsurance | 420 | 350
Net potential impact on net income attributed to shareholders after impact of hedging and reinsurance | (400) | (420)
+10% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | 550 | 530
General fund equity investments | 380 | 400
Total underlying sensitivity before hedging | 930 | 930
Impact of macro and dynamic hedge assets | (190) | (220)
Net potential impact on net income attributed to shareholders after impact of hedging and before impact of reinsurance | 740 | 710
Impact of reinsurance | (350) | (310)
Net potential impact on net income attributed to shareholders after impact of hedging and reinsurance | 390 | 400
+20% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | 1,010 | 980
General fund equity investments | 760 | 780
Total underlying sensitivity before hedging | 1,770 | 1,760
Impact of macro and dynamic hedge assets | (340) | (400)
Net potential impact on net income attributed to shareholders after impact of hedging and before impact of reinsurance | 1,430 | 1,360
Impact of reinsurance | (650) | (580)
Net potential impact on net income attributed to shareholders after impact of hedging and reinsurance | 780 | 780
+30% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | 1,390 | 1,360
General fund equity investments | 1,140 | 1,170
Total underlying sensitivity before hedging | 2,530 | 2,530
Impact of macro and dynamic hedge assets | (460) | (540)
Net potential impact on net income attributed to shareholders after impact of hedging and before impact of reinsurance | 2,070 | 1,990
Impact of reinsurance | (910) | (810)
Net potential impact on net income attributed to shareholders after impact of hedging and reinsurance | $ 1,160 | $ 1,180

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