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Risk Management - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($)
Disclosure of Risk Management [line items] |  |  |
Percentage of debt securities in investment grade with ratings ranging between AAA to BBB | 99.00% | 99.00% | 99.00%
Percentage of total mortgage portfolio | 15.00% | 17.00% | 17.00%
Loaned securities included in invested assets | $ 15,901,000,000 | $ 17,997,000,000 |
Reverse repurchase transactions recorded as short-term receivables | 63,000,000 | 230,000,000 |
Repurchase transactions recorded as payables | $ 64,000,000 | 228,000,000 |
Term of credit default swaps | 5 years |  |
Credit protection purchased | $ 0 | 0 |
Mitigated exposure to credit risk | 7,848,000,000 | 10,138,000,000 |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | 6,707,000,000 | 6,760,000,000 |
Largest single counterparty exposure with master netting agreements or the benefit of collateral held | 245,000,000 | 95,000,000 |
Maximum credit exposure related to derivatives | 14,320,000,000 | 16,204,000,000 |
Reinsurance assets | $ 43,053,000,000 | $ 30,359,000,000 |
Percentage ceded to reinsurers | 94.00% | 92.00% |
Exposure to credit risk | $ 24,435,000,000 | $ 13,855,000,000 |
Net exposure after offsetting agreements and benefit of fair value of collateral held | 18,618,000,000 | 16,504,000,000 |
Bottom of range [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Global retention limit |  |  | $ 30
Top of range [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Global retention limit |  |  | $ 35
Derivatives [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | 2,269,000,000 | 2,629,000,000 |
Largest single counterparty exposure with master netting agreements or the benefit of collateral held | $ 0 | $ 0 |
AA Credit Grades or Higher [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Derivative exposure with counterparties, percentage | 19.00% | 20.00% | 20.00%
Securities lending [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Loaned securities included in invested assets | $ 1,518,000,000 | $ 1,563,000,000 |

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- Definition The amount by which credit derivatives or similar instruments related to loans or receivables mitigate maximum exposure to credit risk. [Refer: Loans and receivables; Credit risk [member]; Maximum exposure to credit risk; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 9 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_9_b&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The amount of financial instruments subject to an enforceable master netting arrangement or similar agreement that are not set off against financial assets. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph IG40D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_IG40D&doctype=Implementation%20Guidance -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 13C -Subparagraph d -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_13C_d_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gross amount of recognised financial assets that are subject either to offsetting or to an enforceable master netting arrangement or similar agreement. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 13C -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_13C_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The maximum exposure to the credit risk of financial assets designated as measured at fair value through profit or loss. [Refer: Credit risk [member]; Maximum exposure to credit risk] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 9 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_9_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount remaining after deducting the amounts subject to an enforceable master netting arrangement or similar agreement that were not set off against financial assets, from the net amount of financial assets subject to offsetting or subject to an enforceable master netting arrangement or similar agreement presented in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 13C -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_13C_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of a cedant’s net contractual rights under a reinsurance contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2018-01-01 -Paragraph 37 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=4&date=2018-03-02&anchor=para_37_e&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The amount of instruments sold with the intent to reacquire in repurchase agreements and cash collateral on securities lent. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Exposure to credit risk offset by collateral held as security. + References No definition available. + Details
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- Definition Percentage of debt securities in investment grade with ratings ranging between AAA to BBB. + References No definition available. + Details
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