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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
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
+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 | $ 600 | $ 1,000
-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 | (600) | (1,000)
+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) | (400)
-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 | 400
-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 | (2,900) | (2,800)
-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 | (1,300) | (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 | (1,600) | (1,500)
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 | 2,800 | 2,700
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 | 1,200 | 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 | $ 1,600 | $ 1,400

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