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Risk Management - Summary of Credit Default Swap Protection Sold (Detail) - CAD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | $ 414,734,000,000 | $ 336,773,000,000
Credit default swaps [Member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | 652,000,000 | 606,000,000
Fair value | $ 9,000,000 | $ 14,000,000
Weighted average maturity (in years) | 2 years | 3 years
Credit default swaps [Member] | AAA [Member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount |  | $ 13,000,000
Weighted average maturity (in years) |  | 1 year
Credit default swaps [Member] | AA [Member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | $ 25,000,000 | $ 35,000,000
Fair value |  | $ 1,000,000
Weighted average maturity (in years) | 2 years | 2 years
Credit default swaps [Member] | A [Member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | $ 447,000,000 | $ 408,000,000
Fair value | $ 7,000,000 | $ 10,000,000
Weighted average maturity (in years) | 2 years | 3 years
Credit default swaps [Member] | BBB [Member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | $ 180,000,000 | $ 150,000,000
Fair value | $ 2,000,000 | $ 3,000,000
Weighted average maturity (in years) | 2 years | 2 years
Credit default swaps [Member] | Single name CDSs [Member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [Line Items] |  |
Notional amount | $ 652,000,000 | $ 606,000,000
Fair value | $ 9,000,000 | $ 14,000,000
Weighted average maturity (in years) | 2 years | 3 years

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