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Risk Management - Schedule of Geographic Concentration of Insurance and Investment Contract Liabilities, Including Embedded Derivatives (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Concentration Risk [Line items] |  |
Concentration risk of liabilities | $ 342,890 | $ 312,790
US and Canada [Member] |  |
Disclosure of Concentration Risk [Line items] |  |
Concentration risk of liabilities | 229,203 | 215,055
Asia and Other [Member] |  |
Disclosure of Concentration Risk [Line items] |  |
Concentration risk of liabilities | 113,687 | 97,735
Gross insurance contract liabilities [Member] |  |
Disclosure of Concentration Risk [Line items] |  |
Concentration risk of liabilities | 388,726 | 354,236
Gross insurance contract liabilities [Member] | US and Canada [Member] |  |
Disclosure of Concentration Risk [Line items] |  |
Concentration risk of liabilities | 273,848 | 255,999
Gross insurance contract liabilities [Member] | Asia and Other [Member] |  |
Disclosure of Concentration Risk [Line items] |  |
Concentration risk of liabilities | 114,878 | 98,237
Reinsurance assets [Member] |  |
Disclosure of Concentration Risk [Line items] |  |
Concentration risk of liabilities | (45,836) | (41,446)
Reinsurance assets [Member] | US and Canada [Member] |  |
Disclosure of Concentration Risk [Line items] |  |
Concentration risk of liabilities | (44,645) | (40,944)
Reinsurance assets [Member] | Asia and Other [Member] |  |
Disclosure of Concentration Risk [Line items] |  |
Concentration risk of liabilities | $ (1,191) | $ (502)

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