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IFRS 7 Disclosures - Summary of Potential Impact on Net Income Attributed to Shareholders Arising from Changes to Spreads (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
+50bp [member] | Corporate spreads [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Potential impact on net income attributed to shareholders arising from changes to spreads | $ 900 | $ 800
-50bp [member] | Corporate spreads [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Potential impact on net income attributed to shareholders arising from changes to spreads | (1,000) | (800)
+20bp [member] | Swap contracts [Member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Potential impact on net income attributed to shareholders arising from changes to spreads |  | (100)
-20bp [member] | Swap contracts [Member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Potential impact on net income attributed to shareholders arising from changes to spreads |  | 100
-10% [member] | Alternative Long-Duration Asset Performance Risk [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Potential impact on net income attributed to shareholders arising from changes to spreads | (3,600) | (3,100)
-10% [member] | Alternative Long-Duration Asset Performance Risk [member] | Real estate, agriculture and timber assets [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Potential impact on net income attributed to shareholders arising from changes to spreads | (1,600) | (1,300)
-10% [member] | Alternative Long-Duration Asset Performance Risk [member] | Private equities and other ALDA [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Potential impact on net income attributed to shareholders arising from changes to spreads | (2,000) | (1,800)
10% [member] | Alternative Long-Duration Asset Performance Risk [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Potential impact on net income attributed to shareholders arising from changes to spreads | 3,300 | 2,900
10% [member] | Alternative Long-Duration Asset Performance Risk [member] | Real estate, agriculture and timber assets [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Potential impact on net income attributed to shareholders arising from changes to spreads | 1,400 | 1,200
10% [member] | Alternative Long-Duration Asset Performance Risk [member] | Private equities and other ALDA [member] |  |
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items] |  |
Potential impact on net income attributed to shareholders arising from changes to spreads | $ 1,900 | $ 1,700

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