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Investment Contract Liabilities - Summary of Investment Contract Liabilities Measured at Amortized Cost and Fair Value Associated with Contracts (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | $ 3,265 | $ 3,126 |
Amortized cost, gross of reinsurance ceded [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | 2,483 | 2,487 | $ 2,644
Amortized cost, gross of reinsurance ceded [Member] | U.S. fixed annuity products [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | 1,357 | 1,282 |
Amortized cost, gross of reinsurance ceded [Member] | Canadian fixed annuity products [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | 1,126 | 1,205 |
Fair value [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | 2,718 | 2,787 |
Fair value [Member] | U.S. fixed annuity products [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | 1,449 | 1,433 |
Fair value [Member] | Canadian fixed annuity products [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | $ 1,269 | $ 1,354 |

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- Definition The amount of liabilities relating to investment contracts that fall within the scope of IAS 39 or IFRS 9. + 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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