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Risk Management - Summary of Effect of Conditional Master Netting and Similar Arrangements (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position | $ 15,901 | $ 17,997
Amounts subject to an enforceable master netting arrangement or similar agreements | (6,707) | (6,760)
Financial and cash collateral pledged (received) | (8,949) | (11,142)
Net amount including financing trusts | 245 | 95
Net amounts excluding financing trusts | 245 | 95
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position | (8,780) | (8,877)
Amounts subject to an enforceable master netting arrangement or similar agreements | 6,707 | 6,760
Financial and cash collateral pledged (received) | 1,869 | 1,900
Net amount including financing trusts | (204) | (217)
Net amounts excluding financing trusts | (33) | (30)
Derivative Assets [Member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position | 14,320 | 16,204
Amounts subject to an enforceable master netting arrangement or similar agreements | (6,644) | (6,714)
Financial and cash collateral pledged (received) | (7,431) | (9,395)
Net amount including financing trusts | 245 | 95
Net amounts excluding financing trusts | 245 | 95
Securities lending [Member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position | 1,518 | 1,563
Financial and cash collateral pledged (received) | (1,518) | (1,563)
Reverse repurchase agreements [Member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position | 63 | 230
Amounts subject to an enforceable master netting arrangement or similar agreements | (63) | (46)
Financial and cash collateral pledged (received) |  | (184)
Derivative Liabilities [Member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position | (8,716) | (8,649)
Amounts subject to an enforceable master netting arrangement or similar agreements | 6,644 | 6,714
Financial and cash collateral pledged (received) | 1,868 | 1,718
Net amount including financing trusts | (204) | (217)
Net amounts excluding financing trusts | (33) | (30)
Repurchase agreements [Member] |  |
Disclosure of offsetting of financial liabilities [Line Items] |  |
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position | (64) | (228)
Amounts subject to an enforceable master netting arrangement or similar agreements | 63 | 46
Financial and cash collateral pledged (received) | $ 1 | $ 182

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