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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, 2018 | Dec. 31, 2017
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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 | $ (3,650) | $ (3,940)
Asset based fees | (480) | (510)
General fund equity investments | (1,150) | (930)
Total underlying sensitivity before hedging | (5,280) | (5,380)
Impact of macro and dynamic hedge assets | 3,110 | 3,220
Net potential impact on net income attributed to shareholders after impact of hedging | (2,170) | (2,160)
-20% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | (2,240) | (2,260)
Asset based fees | (320) | (340)
General fund equity investments | (780) | (590)
Total underlying sensitivity before hedging | (3,340) | (3,190)
Impact of macro and dynamic hedge assets | 1,940 | 1,850
Net potential impact on net income attributed to shareholders after impact of hedging | (1,400) | (1,340)
-10% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | (1,040) | (960)
Asset based fees | (160) | (170)
General fund equity investments | (390) | (270)
Total underlying sensitivity before hedging | (1,590) | (1,400)
Impact of macro and dynamic hedge assets | 910 | 790
Net potential impact on net income attributed to shareholders after impact of hedging | (680) | (610)
10% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | 890 | 670
Asset based fees | 160 | 170
General fund equity investments | 290 | 270
Total underlying sensitivity before hedging | 1,340 | 1,110
Impact of macro and dynamic hedge assets | (820) | (640)
Net potential impact on net income attributed to shareholders after impact of hedging | 520 | 470
20% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | 1,610 | 1,110
Asset based fees | 320 | 340
General fund equity investments | 580 | 540
Total underlying sensitivity before hedging | 2,510 | 1,990
Impact of macro and dynamic hedge assets | (1,450) | (1,100)
Net potential impact on net income attributed to shareholders after impact of hedging | 1,060 | 890
30% [member] |  |
Schedule of Potential Immediate Impact on Net Income Attributed to Shareholders by Changes to Public Equity Returns [line items] |  |
Variable annuity guarantees | 2,170 | 1,410
Asset based fees | 480 | 510
General fund equity investments | 860 | 810
Total underlying sensitivity before hedging | 3,510 | 2,730
Impact of macro and dynamic hedge assets | (1,930) | (1,410)
Net potential impact on net income attributed to shareholders after impact of hedging | $ 1,580 | $ 1,320

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