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Financial Instrument Risk Management - Right of Offset and Collateral (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of offsetting of financial liabilities [abstract] |  |
Gross financial liabilities presented in the Consolidated Statements of Financial Position | $ (4,119) | $ (3,732)
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities | 785 | 694
Financial collateral pledged | 2,939 | 2,730
Net financial liabilities | (395) | (308)
Derivative liabilities |  |
Disclosure of offsetting of financial liabilities [abstract] |  |
Gross financial liabilities presented in the Consolidated Statements of Financial Position | (2,295) | (1,756)
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities | 768 | 694
Financial collateral pledged | 1,132 | 754
Net financial liabilities | (395) | (308)
Financial assets pledged as collateral | 1,726 | 1,127
Repurchase agreements |  |
Disclosure of offsetting of financial liabilities [abstract] |  |
Gross financial liabilities presented in the Consolidated Statements of Financial Position | (1,824) | (1,976)
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities | 17 | 0
Financial collateral pledged | 1,807 | 1,976
Net financial liabilities | 0 | 0
Financial assets pledged as collateral | 1,824 | 1,976
Derivative assets |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross financial assets presented in the Consolidated Statements of Financial Position | 1,112 | 1,478
Financial instruments subject to master netting or similar agreements | (768) | (694)
Financial collateral received | (298) | (662)
Net financial assets | 46 | 122
Disclosure of offsetting of financial liabilities [abstract] |  |
Financial assets received as collateral | 470 | 853
Reverse repurchase agreements |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross financial assets presented in the Consolidated Statements of Financial Position | 17 | 0
Financial instruments subject to master netting or similar agreements | (17) | 0
Financial collateral received | 0 | 0
Net financial assets | 0 | 0
Disclosure of offsetting of financial liabilities [abstract] |  |
Financial assets received as collateral | 17 | 0
Financial assets |  |
Disclosure of offsetting of financial assets [line items] |  |
Gross financial assets presented in the Consolidated Statements of Financial Position | 1,129 | 1,478
Financial instruments subject to master netting or similar agreements | (785) | (694)
Financial collateral received | (298) | (662)
Net financial assets | $ 46 | $ 122

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- Definition The amount of cash collateral received that is subject to an enforceable master netting arrangement or similar agreement and that is not set off against financial assets. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph IG40D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_IG40D&doctype=Implementation%20Guidance -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 13C -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_13C_d_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 14 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_14_a&doctype=Standard -URIDate 2017-03-09 + Details
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