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Investment Contract Liabilities - Summary of Contractual Obligations and Commitments Relating to Investment Contracts (Detail) $ in Millions	Dec. 31, 2021 CAD ($)
Disclosure of Investment Contract Liabilities [line items]
Contractual obligations and commitments	$ 4,809
Less than 1 year [Member]
Disclosure of Investment Contract Liabilities [line items]
Contractual obligations and commitments	292
1 to 3 years [Member]
Disclosure of Investment Contract Liabilities [line items]
Contractual obligations and commitments	486
3 to 5 years [Member]
Disclosure of Investment Contract Liabilities [line items]
Contractual obligations and commitments	489
Over 5 years [Member]
Disclosure of Investment Contract Liabilities [line items]
Contractual obligations and commitments	$ 3,542

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Contractual obligations and commitments,investment contracts.

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Disclosure of Investment Contract Liabilities [line items]

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