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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
-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