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accounting policy developments - Impacts of application of IFRS 9 on carrying amount of portfolio investments (Details) - Financial assets at fair value - CAD ($) $ in Millions | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | ---
Disclosure of initial application of standards or interpretations |  |
Assets | $ 41 | $ 62
As previously reported |  |
Disclosure of initial application of standards or interpretations |  |
Assets | 41 | 62
IFRS 9 effects |  |
Disclosure of initial application of standards or interpretations |  |
Portfolio investments accounted for at fair value through net income that have been adjusted to retained earnings from accumulated other comprehensive income | 4 | 3
Income tax on portfolio investments accounted for at fair value adjusted to retained earnings | 1 | 1
Available-for-sale financial assets | As previously reported |  |
Disclosure of initial application of standards or interpretations |  |
Assets | 41 | 62
Available-for-sale financial assets | IFRS 9 effects |  |
Disclosure of initial application of standards or interpretations |  |
Assets | (41) | (62)
Fair value through net income |  |
Disclosure of initial application of standards or interpretations |  |
Assets | 20 | 41
Fair value through net income | IFRS 9 effects |  |
Disclosure of initial application of standards or interpretations |  |
Assets | 20 | 41
Fair value through other comprehensive income |  |
Disclosure of initial application of standards or interpretations |  |
Assets | 21 | 21
Fair value through other comprehensive income | IFRS 9 effects |  |
Disclosure of initial application of standards or interpretations |  |
Assets | $ 21 | $ 21

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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