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IFRS 7 Disclosures - Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders Arising from Changes to Public Equity Returns (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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 | $ (3,150) | $ (3,270)
General fund equity investments | (1,350) | (1,140)
Total underlying sensitivity before hedging | (4,500) | (4,410)
Impact of macro and dynamic hedge assets | 2,420 | 2,690
Net potential impact on net income attributed to shareholders after impact of hedging | (2,080) | (1,720)
-20% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | (1,850) | (1,930)
General fund equity investments | (840) | (720)
Total underlying sensitivity before hedging | (2,690) | (2,650)
Impact of macro and dynamic hedge assets | 1,410 | 1,580
Net potential impact on net income attributed to shareholders after impact of hedging | (1,280) | (1,070)
-10% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | (800) | (860)
General fund equity investments | (410) | (330)
Total underlying sensitivity before hedging | (1,210) | (1,190)
Impact of macro and dynamic hedge assets | 600 | 670
Net potential impact on net income attributed to shareholders after impact of hedging | (610) | (520)
+10% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | 600 | 620
General fund equity investments | 380 | 340
Total underlying sensitivity before hedging | 980 | 960
Impact of macro and dynamic hedge assets | (620) | (580)
Net potential impact on net income attributed to shareholders after impact of hedging | 360 | 380
20% change in market value equity. |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | 1,040 | 1,060
General fund equity investments | 760 | 680
Total underlying sensitivity before hedging | 1,800 | 1,740
Impact of macro and dynamic hedge assets | (1,110) | (1,020)
Net potential impact on net income attributed to shareholders after impact of hedging | 690 | 720
+30% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | 1,350 | 1,360
General fund equity investments | 1,130 | 1,020
Total underlying sensitivity before hedging | 2,480 | 2,380
Impact of macro and dynamic hedge assets | (1,480) | (1,340)
Net potential impact on net income attributed to shareholders after impact of hedging | $ 1,000 | $ 1,040

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